Trifolium haydenii (1996)
FABACEAE
Trifolium haydenii Porter
U.S.A., Wyoming, Park County: Northern Absaroka Area: Wapiti Ridge Area: Houlihan Creek and ridge to southwest.
Volcanics; ridge top with rocky slopes. Phenology: flowering.
with David Rosenthal
Accession: USFS 852509, Barcode: USFS0036398

Trifolium haydenii (1989)
FABACEAE
Trifolium haydenii Porter
U.S.A., Wyoming, Park County: Northern Absarokas: Bald Ridge above Clarks Fork Yellowstone River, ca 23 air mi NW of Cody.
Elev. 7200 ft.
Meadows in limber pine woods on redbeds. Phenology: flowering.
Accession: RM 855079, Barcode: USFS0040633

Trifolium haydenii (1989)
FABACEAE
Trifolium haydenii Porter
U.S.A., Wyoming, Park County: Northern Absarokas: Bald Ridge above Clarks Fork Yellowstone River, ca 23 air mi NW of Cody.
Elev. 7200 ft.
Limestone outcrops and cliffs with Kelseya. Phenology: flowering.
Accession: RM 855080, Barcode: USFS0040634

U.S.A., Wyoming, Hot Springs County: Absaroka Mountains, ca 2-3 mi S of South Fork and North Fork Owl Creek, 44 mi WNW of Thermopolis.
T43N R102W S10; also S11
On ridge, alpine meadow with Geum rossii, Lomatium cous, Carex obtusata and Erigeron rydgergii. Phenology: flowering.
Accession: RM 824680, Barcode: rm0023132

U.S.A., Wyoming, Park County: Yellowstone National Park: Gallatin Range: Bighorn Pass; 15 mi SW of Mammoth.
Elev. 9100 ft.
Sub-alpine meadow with Sibbaldia procumbens, Trifolium haydenii, Castilleja rhexifolia, and Trisetum spicatum. Phenology: flowering.
Accession: RM 824718, Barcode: RM0019623

U.S.A., Wyoming, Park County: Yellowstone National Park: Gallatin Range: summit and west side of Mount Holmes, 17 mi sw of Mammoth.
Talus and fellfield with Erigeron compositus, Hulsea algida, and Douglasia montana. Phenology: flowering & fruiting.
Accession: RM 824372, Barcode: RM0019240

U.S.A., Wyoming, Park County: Absaroka Mountains: Shoshone National Forest: Bald Ridge ca 5 mi N of Wyo Hwy 296 (Chief Joseph Highway), 30 mi NW of Cody.
Near edge of escarpment on limestone scree and pavement with Shoshonea pulvinata, Eritrichium howardii, and Trifolium haydenii. Phenology: flowering & fruiting.
Accession: RM 824890, Barcode: RM0016335

U.S.A., Wyoming, Hot Springs County: Absaroka Mountains: Shoshone National Forest: summit and north side of Cottonwood Peak, head of Cottonwood Creek, ca 45 mi NW of Thermopolis.
Rocky alpine meadow with Geum rossii, Silene acaulis, Trifolium dasyphyllum, and Lomatium cous. Phenology: flowering & fruiting.

U.S.A., Montana, Park County: Gallatin Range: Yellowstone National Park: summit of Sepulcher Mountain 3 mi NW of Mammoth.
Openings in whitebark pine-spruce-fir forest with Vaccinium scoparium, Arnica latifolia, and Poa nervosa var. wheeleri. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Gallatin Range: Yellowstone National Park: on southeast ridge of Electric Peak just below summit, 7 mi WNW of Mammoth.
Talus and scree with Hulsea algida, Penstemon montanus, and Saxifraga bronchialis var. austromontana. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Absaroka Mountains: Shoshone National Forest: along Phelps Mountain Road (Forest Road 207), ca 2 mi NE of Phelps Mountain, ca 23 mi W of Meeteetse.
Near timberline with scattered Picea engelmannii, Geum rossii, and Trifolium dasyphyllum. Phenology: flowering.

U.S.A., Wyoming, Park County: Absaroka Mountains: Shoshone National Forest: ridge at the head of West Fork Timber Creek, ca 24 mi SW of Meeteetse.
Subalpine meadow and spruce-fir parkland with Trifolium haydenii, Poa alpina, Trifolium parryi, and Carex obtusata. Phenology: flowering & fruiting.

U.S.A., Montana, Beaverhead County: Beaverhead Mountains: Beaverhead National Forest: north side of the Lima Peaks at head of East Fork Little Sheep Creek, ca 6 mi S of Lima.
T15S R8W S8
Talus with Collomia debilis and Penstemon montanus. Phenology: flowering & fruiting.

U.S.A., Montana, Beaverhead County: Beaverhead Mountains: Beaverhead National Forest: west side of Morrison Lake at base of Baldy Mountain, ca 23 mi W of Lima.
T14S R12W S22
Base of east-facing talus slope with Saxifraga bronchialis var. austromontana, Penstemon montanus, and Phacelia hastata. Phenology: flowering.

U.S.A., Wyoming, Park County: Absaroka Mountains: North Fork Shoshone River Drainage: north-south trending ridge between Horse Creek and Grizzly Creek ca 2-5 mi N of U.S. Hwy 14, 16, & 20.
Rocky ridgetop, sagebrush-grassland/Douglas fir-limber pine mosaic. Phenology: flowering.

U.S.A., Wyoming, Park County: Absaroka Mountains: South Fork Shoshone River Drainage: north-south trending ridge immediately N of Marquette Creek, ca 22 mi SW of Cody on north side of Carter Mountain.
Open forest dominated by Picea engelmanii with some Abies lasiocarpa and Pinus albicaulis on steep north-facing slope. Phenology: flowering.

U.S.A., Wyoming, Park County: Absaroka Mountains: divide between Morning and Big Tree creeks, ca 14 mi N of U.S. Hwy 14, 16, & 20.
In forest of Picea engelmannii on north-facing slope. Phenology: flowering.

U.S.A., Wyoming, Park County: [location and coordinates withheld]
Along mostly treeless limestone escarpment, prominent species included: Shoshonea pulvinata, Aquilegia jonesii, and Trifolium haydenii on pavement and talus and Kelseya uniflora and Telesonix heucheriformis in cliff crevices. Phenology: flowering.

U.S.A., Wyoming, Park County: [location and coordinates withheld]
Meadow and forest edge, prominent species included: Festuca altaica ssp. hallii, Festuca idahoensis, Oxytropis campestris var. gracilis, and Trifolium haydenii. Phenology: flowering.

U.S.A., Wyoming, Park County: Northern Absarokas: Clarks Fork Yellowstone River Drainage: north slope of Pat O'Hara Peak, ca 22 mi NW of Cody.
Open, mostly sparsely vegetated habitats on limestone derived substrates. Phenology: fruiting.

U.S.A., Idaho, Fremont County: Targhee National Forest: Centennial Mountains: summit of Sawtell Peak, ca 10 mi NNW of Island Park.
Treeless and tundra-like with Lomatium cous, Potentilla diversifolia, Carex elynoides and Dodecatheon pulchellum.
Accession: RM (unaccessioned)

U.S.A., Montana, Carbon County: Beartooth Mountains: Custer National Forest: just E of Lake Mary, ca 15 mi W of Red Lodge.
In tundra-forest ecotone; with Pinus albicaulis, Trifolium haydenii, Phyllodoce empetriformis, Phyllodoce glanduliflora and Potentilla diversifolia.
Accession: RM 619492

U.S.A., Montana, Park County: Absaroka-Beartooth Mountains: Gallatin National Forest: along South Fork Deep Creek, ca 12 mi SE of Livingston.
In open, mixed forest; with Picea engelmannii, Abies lasiocarpa and some Pinus albicaulis with a groundlayer of Arnica cordifolia.
Accession: RM 619800

U.S.A., Montana, Gallatin County: Gallatin Range: Gallatin National Forest: south slopes of Ramshorn Peak near summit, ca 4 mi NW of Tom Miner Campground.
In alpine meadow; just above timberline; with Lomatium cous, Geum rossii, Trifolium haydenii, and Myosotis alpestris.
Accession: 739300

U.S.A., Montana, Madison County: Madison Range: Beaverhead National Forest: west side of Sphinx Mountain, ca 15 mi SE of Ennis.
On west facing limestone scree slopes and ledges; with Trifolium haydenii, Pedicularis parryi ssp. purpurea, Carex nardina, and Minuartia nuttallii.
Accession: RM 739976

U.S.A., Montana, Madison County: Madison Range: Gallatin National Forest: east ridge and sub-summit of Lone Mountain, ca 9 mi W of Big Sky.
In sparsely vegetated andesitic talus; with Hulsea algida, Stellaria americana, Trifolium haydenii, and Oxyria digyna.

U.S.A., Idaho, Fremont County: Targhee and Beaverhead National Forests: Henrys Lake Mountains: on Continental Divide just NW of Targhee Peak, ca 19 mi WNW of West Yellowstone, Montana; also Madison County, Montana.
In alpine tundra and krummholz; at timberline; with Arnica rydbergii and Carex elynoides. Phenology: flowering.

U.S.A., Montana, Stillwater County: Beartooth Mountains: Custer National Forest: ca 1 1/2 mi N of Chrome Lake near the head of Nye Creek, ca 5 mi S of Nye.
Openings in whitebark pine woodland on calcareous substrates with Carex rupestris and Aquilegia jonesii. Phenology: flowering & fruiting.

U.S.A., Montana, Stillwater County: Beartooth Mountains: Custer National Forest: West Rosebud Canyon 1/4-1/2 mi SW of power plant; ca 27 mi WNW of Red Lodge.
In openings in lodgepole pine forest; with Festuca idahoensis, Danthonia intermedia, Penstemon procerus, and Gaillardia aristata. Phenology: flowering & fruiting.

U.S.A., Montana, Carbon County: Beartooth Mountains: Custer National Forest: Rosebud Canyon, east side of Elk Lake.
Mossy ledges and talus with Arnica latifolia var. gracilis, Cryptogramma acrostichoides, Woodsia scopulina, and Erigeron acris. Phenology: flowering.

U.S.A., Montana, Park County: Absaroka-Beartooth Mountains: Gallatin National Forest: ridge at head of Arrastra Creek: ca 3 mi E of Emigrant Peak, 18 mi N of Gardiner.
Sparsely vegetated, rocky tundra and talus with Hulsea algida, Collomia debilis var. trifida, Chaenactis alpina, and Sibbaldia procumbens. Phenology: flowering.

U.S.A., Montana, Madison County: Madison Range: Gallatin National Forest: Koch Basin on the east side of Koch Peak at head of Tumbledown Creek, ca 25 mi SE of Ennis.
On turfy tundra; with Geum rossii, Erigeron simplex, Artemisia scopulorum, and Carex nigricans. Phenology: flowering.

U.S.A., Montana, Gallatin County: Madison Range foothills: Ousel Falls on West Fork Gallatin River, 6 mi W of Montana Highway 191.
In spruce-fir forest; with some lodgepole pine and with ground layer dominated by Carex geyeri and Vaccinium scoparium. Phenology: flowering.

U.S.A., Montana, Gallatin County: Gallatin Range foothills: along the south side of Squaw Creek, 1/4 mi E of Rat Lake Road, 20 mi SW of Bozeman.
On gravel bars; with Astragalus alpinus, Polemonium pulcherrimum, and Erigeron compositus. Phenology: flowering & fruiting.

U.S.A., Montana, Park County: Absaroka Mountains: Gallatin National Forest: east ridge of Monitor Peak, 13 mi NE of Gardiner.
In east facing slope; in open, rocky area; with Penstemon fruticous, Erigeron compositus, Saxifraga bronchialis, and Cryptogramma acrostichoides. Phenology: flowering & fruiting.

U.S.A., Montana, Stillwater County: Beartooth Mountains: Custer National Forest: along trail ca 2 mi W of Slough Lake; 25 mi W of Red Lodge.
In openings in whitebark pine forest; with Trifolium haydenii, Trisetum spicatum, and Agoseris glauca var. dasycephala. Phenology: flowering.

U.S.A., Montana, Gallatin County: Gallatin Range: Gallatin National Forest: Hidden Lakes, 4 mi E of U.S. Hwy 191, ca 30 mi SSW of Bozeman.
T6S R4E S36
Openings in whitebark pine-spruce forest with Astragalus alpinus, Antennaria lanata, and Senecio crassulus. Phenology: flowering & fruiting.

U.S.A., Montana, Park County: Absaroka-Beartooth Mountains: Gallatin National Forest: Monitor Peak, ca 12 mi N of Gardiner.
T8S R9E S5
Turfy, mesic, alpine tundra with Deschampsia cespitosa, Potentilla diversifolia, Juncus drummondii, and Salix arctica. Phenology: flowering.

U.S.A., Montana, Park County: Absaroka-Beartooth Mountains: Gallatin National Forest: along the south side of the North Fork Sixmile Creek, 15 mi N of Gardiner.
Meadow opening on north-facing slope with Hackelia micrantha, Valeriana occidentalis, and Thlaspi montanum. Phenology: flowering.

U.S.A., Montana, Park County: Absaroka-Beartooth Mountains: Gallatin National Forest: north side of Chico (Baldy) Peak, 21 mi N of Gardiner.
Mesic, turfy tundra on north-facing slope with Potentilla diversifolia, Deschampsia cespitosa, and Poa alpina. Phenology: flowering.

U.S.A., Montana, Gallatin County: Gallatin Range: Gallatin National Forest: Head of East Fork Hyalite Creek around Heather lake; ca 22 m S of Bozeman.
T5S R6E S13; also S14
Rocky, turfy tundra on north facing slope with Geum rossi, Phyllodoce empetriformis and Sibbaldia procumbens. Phenology: flowering.

U.S.A., Montana, Gallatin County: Gallatin Range: Gallatin National Forest: head of Blackmore Creek, 18 mi S of Bozeman.
Alpine tundra on north-facing slope with Deschampsia cespitosa, Polygonum bistortoides, and Saxifraga subapetala. Phenology: flowering.

U.S.A., Wyoming, Park County: Rattlesnake Mountain: ca 11 mi NE of Cody.
Meadow in shallow soil, limestone terrain with Poa fendleriana, Festuca idahoensis, Arenaria, Ranunculus, Trifolium, Dodecatheon; surrounding forest is lodgepole pine (Pinus contorta0.. Phenology: flowering.

U.S.A., Wyoming, Park County: Absaroka Mountains: North Fork Shoshone River Drainage: west side of Rattlesnake Mountain.
Growing with Juniperus horizontalis, Oxytropis lagopus, and Clematis columbiana. Phenology: flowering.

U.S.A., Wyoming, Hot Springs County: Southeastern Absarokas: Shoshone National Forest: ridge just SE of Twin Lakes, ca 33 mi SSW of Meeteetse.
Limber pine woodland and rocky openings with Lomatium cous, Phlox hoodii, Leucopoa kingii, and Antennaria rosea. Phenology: flowering.

U.S.A., Wyoming, Park County: Absaroka Mountains: North Fork Shoshone River Drainage: headwaters of Canyon Creek; ca 6 mi S of U.S. Hwy 14.
Near timberline. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Absaroka Mountains: North Fork Shoshone River Drainage: on Cougar Creek-Pagoda Creek Divide, ca 5 mi S of U.S. Hwy 14, 16 and 20.
In spruce-fir forest openings. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Absaroka Mountains: North Fork Shoshone River Drainage: ca 3-4 mi S of U.S. Hwy 14, top of Clayton Mountain.
Tundra. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Absaroka Mountains: North Fork Shoshone River Drainage: ridge E of June Creek, ca 1 mi S of U.S. Hwy 14, 16, & 20.
Sagebrush grassland. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Absaroka Mountains: ca 0.1 mi S of Brown Mountain Campground.
On north facing slope under mixed conifers. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: North Fork Shoshone River Drainage: Absaroka Mountains: on the divide between Green and Hardpan creeks, ca 5 mi S of U.S. Hwy 14, 16, & 20.
In the forest-tundra ecotone. Phenology: flowering.

U.S.A., Wyoming, Park County: North Fork Shoshone River Drainage: Absaroka Mountains: north side of Clayton Mountain, ca 3-4 mi S of U.S. Hwy 14, 16, & 20.
Steep, north-facing slope in open areas at forest edge with scattered Pseudotsuga, Abies, and Picea. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: North Fork Shoshone River Drainage: Absaroka Mountains: ridge E of Canyon Creek, ca 5-6 mi S of U.S. Hwy 14, 16, & 20.
Mixed conifer forest of Pinus albicaulis, Picea engelmannii, Abies lasiocarpa, and Pseudotsuga menziesii. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Beartooth Range: near tree line high on Quintuple Peaks.
Alpine tundra. Phenology: flowering & fruiting.
Philip L. Johnson, 26a. 7/13/1958.

U.S.A., Wyoming, Park County: Shoshone National Forest: Timber Creek.
Slope 10% northeast; soil rocky loam; openings in timber patches with Carex, Poa, and Trisetum. Common. Phenology: flowering.
Accession: USFS 407342, Barcode: USFS0030549

U.S.A., Wyoming, Park County: Above Gardner Lake.
Rocky slopes above lake. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County:
44.702° N, 109.3714° W; NAD 83, uncertainty 0.5 mi., Nat. Geog. TOPO!
Mossy bank along stream under open spruce with Arnica and Geranium. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County:
Open limber pine with Pentaphylloides and Valeriana. Phenology: flowering.

U.S.A., Wyoming, Park County: Beartooth Plateau: Twin Lakes Reasearch Natural Area: plateau on west side of Twin Lakes Basin, on north side of U.S. Hwy 212, 1 1/4-2 air mi S of Montana.
Alpine turf meadow on rocky granite talus and boulder field on n facing slope above snowdrift. Phenology: flowering.

U.S.A., Wyoming, Park County: Absaroka Range: North Fork Shoshone River Drainage: slopes on south side of summit rim of Clayton Mountain and northernmost end of saddle connecting Clayton and Double Mountain, ca 1.1 mi E of East Fork Blackwater Creek, 3.2 mi S of U.S. Hwy 14, 16 & 20.
West facing subalpine slopes of Engelmann spruce/whitebark pine on reddish, thin sandy-clay andesite volcanic soil; understory dominated by Trifolium patches.
Accession: RM (unaccessioned)

U.S.A., Wyoming, Park County: Absaroka Mountains: North Fork Shoshone River Drainage: slopes on south side of summit rim of Clayton Mountain and north end of saddle connecting Clayton and Double Mountain; ca 1.1 mi E of East Fork Blackwater Creek.
West facing subalpine slopes of Engelmann spruce/whitebark pine on reddish volcanic soil. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Absaroka Range: north end of ridge dividing Timber Creek and the Gwinn Fork of Dick Creek, ca 1.5 mi S of Timber Creek Ranger Station; ca 17 air mi W of Meeteetse.
Steep, loose volcanic sandy scree on steep, north-facing slope below volcanic cliffs with scattered Pseudotsuga menziesii and Pinus flexilis; ground cover mostly bare rock and gravel. Phenology: flowering.

U.S.A., Wyoming, Park County: Absaroka Range: north side of Pat O'Hara Peak on north side of Pat O'Hara Mountain, ca 3.75 air mi S of Wyo Hwy 296 (Chief Joseph Highway).
Subalpine north-facing slopes of scattered limestone rock and meadows of Poa, Phleum alpinum, and Elymus trachycaulus in openings in Picea engelmannii forests. Phenology: flowering.
with George Jones

U.S.A., Wyoming, Park County:
Mossy bank along stream under open spruce with Arnica and Geranium. Phenology: flowering & fruiting.

U.S.A., Idaho, Clark County: Targhee National Forest: Western Centennial Mountains: on the Continental Divide at the head of East Fork Irving Creek between Knob Mountain and The Thumb, ca 27 air mi NW of Dubois.
T13N R33E S3
Patches of soil on rocky ridge.
with Michelle Nelson
Accession: (unaccessioned)

U.S.A., Idaho, Clark County: Targhee National Forest: Western Centennial Mountains: just N of summit of Red Conglomerate Peaks, ca 28 air mi NW of Dubois.
T13N R33E S5
Rocky outcrops dominated by forbs and grasses.
Accession: (unaccessioned)

U.S.A., Idaho, Clark County: Targhee National Forest: Beaverhead Range: slope W of Gallagher Peak, ca 30 air mi W of Dubois.
T10N R31E S27
Steep, rocky slope dominated by scattered forbs and grasses.
Accession: (unaccessioned)

U.S.A., Idaho, Fremont County: Targhee National Forest: Centennial Mountains: summit of Sawtell Peak, ca 4 air mi S of Henrys Lake.
Mostly grasses, scattered forbs.

U.S.A., Idaho, Fremont County: Targhee National Forest: Henrys Lake Mountains: above West Targhee Creek, ca 12 air mi NW of West Yellowstone, Montana.
T16N R43E S21; also S27
Open ridge dominated by forbs and grasses with scattered patches of Pinus albicaulis.

U.S.A., Wyoming, Park County: Southeastern Absarokas: along East Fork of the South Fork Wood River between the mouth of Slaughter Creek and Guard Station Park, ca 27.3 air mi SW of Meeteetse.
Spruce forest in stream bottom. Phenology: flowering.
with Robert S. and Ruth E. B. Kirkpatrick

U.S.A., Wyoming, Hot Springs County: Southeastern Absarokas: Castle Rocks and vicinity in North Fork Owl Creek drainage, ca 43 air mi WNW of Thermopolis.
Edge of spruce forest. Phenology: flowering.

U.S.A., Wyoming, Park County: Northern Absarokas: south end of Bald Ridge, 3-4 air mi NE of Dead Indian Pass, ca 23 air mi NW of Cody.
Under limber pine. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Northern Absarokas: near Bear Springs ca 3.5 air mi W of Pat O'Hara Peak, ca 21 air mi WNW of Cody.
Phenology: flowering & fruiting.

U.S.A., Wyoming, Hot Springs County: Absaroka Mountains: ca 39 mi WNW of Thermopolis on North Fork of Owl Creek.
Rock and sand bars in the river bottom. Phenology: flowering & fruiting.
Robert S. Kirkpatrick, 160. 6/23/1983.
with B. E. Nelson

U.S.A., Wyoming, Hot Springs County: Absaroka Mountains: ca 27 air mi SSW of Meeteetse, junction of South Fork and East Fork of South Fork Wood River and Slaughter Creek.
Engelmann spruce and subalpine fir forest. Phenology: flowering.
Robert S. Kirkpatrick, 1601. 7/26/1983.
with Ruth E. B. Kirkpatrick

U.S.A., Wyoming, Hot Springs County: Absaroka Mountains: ca 22 air mi SSW of Meeteetse, ca 0.5 mi N of the headwaters of Grass Creek, S of Twin Lakes.
Dry meadows on ridge with Trifolium dasyphyllum var. uintense. Phenology: flowering.
Robert S. Kirkpatrick, 3046. 6/27/1984.

U.S.A., Wyoming, Park County: Absaroka Mountains: ca 16 air mi SW of Meeteetse, upper end of the North Fork of Dick Creek, ca 5 mi from the Wood River.
Pinus contorta forest with Arnica cordifolia; dry, forested areas. Phenology: flowering.
Robert S. Kirkpatrick, 3234a. 6/29/1984.

U.S.A., Wyoming, Hot Springs County: Absaroka Mountains: ca 21 air mi SSW of Meeteetse, in the vicinity of the headwaters of West Grass Creek.
Subalpine meadows; dry areas. Phenology: flowering.

U.S.A., Wyoming, Park County: Absaroka Mountains: ca 19 air mi SW of Cody, ca 1 mi NE of Belknap Creek in the vicinity and to the NE of Peak 8981.
Picea engelmannii and Abies lasiocarpa forest; dry forested areas. Phenology: flowering.

U.S.A., Wyoming, Hot Springs County: Absaroka Mountains: ca 24 air mi SSW of Meeteetse, head of Cottonwood Creek in the vicinity of Cottonwood Peak.
Alpine fell fields. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Absaroka Mountains: ca 23 air mi SW of Meeteetse, east side of Dundee Mountain, between Dundee Creek and the "South Fork" Beaver Creek.
Alpine fellfields. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Absaroka Mountains: ca 17 air mi SSE of Cody, upper end of Carter Creek ca 1 mi SE of Hidden Lake.
Pinus flexilis and Picea engelmannii forest; dry slopes. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Absaroka Mountains: ca 19 air mi SW of Meeteetse, upper end of the South Fork of Dick Creek and along the Timber Creek Trail.
Exposed alpine ridge. Phenology: flowering.
with Ruth E. B. Kirkpatrick

U.S.A., Wyoming, Park County: Absaroka Mountains: ca 19 air mi WSW of Meeteetse along the Timber Creek Trail from north side of Dick Creek Lakes to trail junction with Timber Creek.
Loose talus slopes. Phenology: flowering.
with Ruth E. B. Kirkpatrick

U.S.A., Wyoming, Park County: Absaroka Mountains: Wood River between Brown Mountain and Upper Wood River campgrounds and along Deer Creek.
River and creek bottoms and adjacent rocky benches and slopes with scattered lodgepole pine, engelmann spruce, and limber pine and big sagebrush. Phenology: flowering.
with Robert S. Kirkpatrick

U.S.A., Wyoming, Park County: Northern Absarokas: Pat O'Hara Peak, ca 2 mi W of summit.
Open grassy slopes with limestone outcrops and spruce woodland margins. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Absaroka Mountains: Shoshone National Forest: ca 2.5 air mi S of Wood River, ca 1/4 mi W of Brown Creek, ca 19 air mi SW of Meeteetse.
North-facing cliffs of conglomerate rock. Phenology: flowering.
with Kevin J. Taylor

U.S.A., Montana, Gallatin County: Gallatin Range: Gallatin National Forest: vicinity of Windy Pass, ca 29 air mi S of Bozeman.
Steep open slope and into mixed conifer forest. Phenology: flowering.
with Ronald L. Hartman
Accession: RM 869322, Barcode: USFS0063800

U.S.A., Montana, Park County: Absaroka Range: Gallatin National Forest: Mount Wallace, ca 33 air mi SSE of Livingston.
Late snow field on north facing slope with large amount of bare ground; rock outcrop on peak top. Phenology: flowering & fruiting.
with Brian Elliott

U.S.A., Montana, Park County: Absaroka Range: Gallatin National Forest: along trail to Wallace Pass above Wallace Creek, ca 32.5 air mi SSE of Livingston.
Subalpine meadow and Pinus flexilis forest. Phenology: flowering & fruiting.
with Brian Elliott

U.S.A., Montana, Sweet Grass County: Beartooth Mountains: Gallatin National Forest: Derby Mountain along Forest Road 6676, ca 17.5 air mi SSE of Big Timber.
In burned area dominated by forbs and rocky ridgetop. Phenology: flowering.
with Brian Elliott

U.S.A., Montana, Park County: Absaroka Range: Gallatin National Forest: along Suce Creek Trail in the vicinity of Elephanthead Mountain, ca 10 air mi SE of Livingston; then N to Mission Creek.
Alpine below dolomite cliffs dominated by forbs. Phenology: flowering.

U.S.A., Montana, Gallatin County: Gallatin Range: Gallatin National Forest: near Buffalo Horn Pass, ca 38 air mi S of Bozeman; from Buffalo Horn Trailhead to Tom Miner Trailhead, ca 38 air mi S of Bozeman.
Subalpine meadow amongst Pinus flexilis and Picea. Phenology: flowering.

U.S.A., Montana, Gallatin County: Gallatin Range: Gallatin National Forest: Ramshorn Peak, ca 36 air mi S of Bozeman
Alpine meadow with conglomerate rocky outcrops. Phenology: flowering.

U.S.A., Montana, Gallatin County: Gallatin Range: Gallatin National Forest: Twin Peaks, ca 36 air mi S of Bozeman.
Alpine meadow with conglomerate rocky outcrops. Phenology: flowering.

U.S.A., Montana, Park County: Absaroka Range: Gallatin National Forest: between West Boulder Plateau and Falls Creek, ca 33 air mi SSW of Big Timber.
Picea and Pinus flexilis with Vaccinium understory and scattered open talus slopes. Phenology: flowering & fruiting.

U.S.A., Montana, Park County: Absaroka Range: Near West Boulder Plateau and Falls Creek, ca 35 air mi SSW of Big Timber.
Vegetated talus slope in subalpine zone. Phenology: flowering & fruiting.

U.S.A., Montana, Park County: Absaroka Range: Gallatin National Forest: West Boulder Plateau, ca 32.5-33 air mi SSW of Big Timber.
Alpine meadow with talus and boulder fields. Phenology: flowering & fruiting.

U.S.A., Montana, Sweet Grass County: Absaroka Range: Gallatin National Forest: Absaroka/ Beartooth Wilderness, along the East Fork Boulder River and across divide to Basin Creek, ca 17-20 air mi NW of Cooke City.
Subalpine meadows and Picea/Abies/Pinus flexilis forest. Phenology: flowering.

U.S.A., Wyoming, Park County: Absaroka Mountains: North Fork Shoshone River Drainage: Shoshone National Forest: ridge just W of Pagoda Creek ca 4 mi S of U.S. Hwy 14, 16, & 20, ca 30 mi W of Cody.
Open spruce-fir forest with Trifolium parryi, Lupinus polyphyllus var. humicola, and Arenaria congesta. Phenology: flowering & fruiting.

U.S.A., Montana, Carbon County: Beartooth Mountains: Custer National Forest: western edge of the Line Creek Plateau, E of U.S. Hwy 212 (Beartooth Highway), ca 13 air mi SW of Red Lodge.
Steep west-facing slope with talus fields and patchy vegetation. Phenology: flowering.

U.S.A., Montana, Stillwater County: Beartooth Mountains: Custer National Forest: on the north slope of Froze-to-Death Plateau, ca 16 air mi NE of Cooke City.
Open mixed conifer forest interspersed with talus. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Beartooth Mountains: Shoshone National Forest: unnamed plateau ca 5 air mi ENE of Beartooth Pass, and S of Line Creek Plateau, ca 14.5 air mi SSW of Red Lodge, Montana.
Alpine meadows and talus. Phenology: flowering & fruiting.

U.S.A., Montana, Carbon County: Beartooth Mountains: Custer National Forest: top of Line Creek Plateau, ca 5-7.5 air mi NE of Beartooth Pass, ca 12-13 air mi SSW of Red Lodge.
Alpine meadows and talus. Phenology: flowering & fruiting.

U.S.A., Wyoming, Hot Springs County: Absarokas Mountains: Shoshone National Forest: ridge 1 mi W of Cottonwood Peak at head of North Fork Owl Creek, ca 46 mi NW of Thermopolis.
Alpine with discontinuous turf of Geum rossii, Carex rupestris, and Potentilla diversifolia. Phenology: flowering.

U.S.A., Montana, Gallatin County: Bridger Range: Gallatin National Forest: just E of Fairy Lake, ca 15 mi NNE of Bozeman.
Opening in spruce-fir forest with Erythronium grandiflorum, Claytonia lanceolata, and Valeriana occidentalis. Phenology: flowering.

U.S.A., Montana, Gallatin County: Bridger Range: just N of the summit of Sacagewa Peak, ca 17 mi N of Bozeman.
T2N R6E S27 NW1/4
In open, treeless area; with much bare ground on limestone substrate dominated by: Dryas octopetala, Lloydia serotina, Carex rupestris and Antennaria aromatica. Phenology: flowering.

U.S.A., Montana, Stillwater County: Beartooth Mountains: S of Mystic Lake, ca 28 mi WNW of Red Lodge.
T7S R16E S17
In lodgepole pine forest; with a groundlayer of Vaccinium scoparium and in more open areas with Trifolium haydenii. Phenology: flowering.

U.S.A., Montana, Park County: Absaroka-Beartooth Mountains: Gallatin National Forest: north side Elephant Head Mountain, ca 13 mi SE of Livingston.
In crevices of steep, north facing limestone pavement; with Dryas octopetala, Lloydia serotina, Trifolium hardenii. Phenology: flowering.

U.S.A., Montana, Gallatin County: Gallatin Range: summit of Hyalite Peak (Gallatin National Forest), ca 23 mi S of Bozeman.
On turfy tundra; dominated by Trifolium haydenii, Carex scirpoidea var. pseudoscirpoidea, and Pedicularis cystopteridifolia. Phenology: flowering.

U.S.A., Montana, Park County: Absaroka Mountains: Near West Boulder Plateau.
Covered large patches on the crest of the high ridge solidly. Phenology: flowering & fruiting.
Klaus H. Lackschewitz, 9774. 7/27/1981.

U.S.A., Montana, Gallatin County: Gallatin Range: summit of Hyalite Peak.
Phenology: flowering.

U.S.A., Montana: HW 12, between Cooke City and Red Lodge.
On hill; along highway. Phenology: flowering.
with Hamilton

U.S.A., Montana, Park County: Boulder River Canyoin: 10 mi W of Four Mile Ranger Station: top of Silver Pass.
Phenology: flowering.
Annotations:
2. Trifolium haydenii Porter
Annotated by John M. Gillett in 1971.

U.S.A., Montana, Gallatin County: Gallatin National Forest: Bridger Mountains, W of Fairy Lake, ca 12 mi NNE of Bozeman.
Alpine meadows. Phenology: flowering.
with R. L. Taylor

U.S.A., Montana: Along HW U.S. 12, 1.5 mi N of Montana Wyoming line.
Phenology: flowering.

U.S.A., Montana: 35 mi N of Bozeman, near Fairy Lake.
In shaded areas; in timber. Phenology: flowering.
with M. D. Atkins

U.S.A., Montana, Gallatin County: Bozeman: above Fairy Lake and about 0.5 mi from summit of Sacajawea Peak.
In saddle; moist alpine meadow. Phenology: flowering.

U.S.A., Montana: Hyalite Canyon, 24 mi S of Bozeman.
In patches; in timber area; on moist site. Phenology: flowering.
with M. D. Atkins

U.S.A., Montana: Mountains near Indian Creek.
with Ernst A. Bessey

U.S.A., Montana, Gallatin County: Haylite Peak.
Rock ledge; cystopteris and polemonium. Common. Phenology: flowering.

U.S.A., Montana, Carbon County: At the rim of the Beartooth Mountains: just W of Quad Creek, 23 mi SW of Red Lodge.
On west-facing coarse, granitic-sohistoid, stable talus. Phenology: flowering.
Arthur Cronquist, 8058. 8/4/1955.

U.S.A., Montana: Absaroka National Forest: West Fork and Passage Creek Divide.
East slope; clay soil. Phenology: flowering.
Accession: USFS 509317

U.S.A., Montana: Bridger Mountains.
with Ernst A. Bessey

U.S.A., Montana: Absaroka National Forest: near Davis Creek Lake.
Northwest slope; gravel soil. Phenology: flowering.
Accession: USFS 509316

U.S.A., Montana, Gallatin County: Flanders Crater Lake Trail: Middle Creek Canyon.
On wooded hillside. Phenology: flowering.

U.S.A., Montana, Carbon County: Wyoming Montana Border, about 1.5 mi N of the line on the Red Lodge-Cooke City HW.
Among rocks. Phenology: flowering.

U.S.A., Montana, Park County: Absaroka National Forest.
Shallow loam and rock; alpine plants. Phenology: flowering.
Accession: USFS 509315

U.S.A., Montana, Carbon County: Beartooth National Forest: Red Lodge Creek Plateau.
William E. Lockhart, 666. 7/30/1916.

U.S.A., Montana, Gallatin County: Gallatin Range: Mount Hyalite.
Collectors number adjacent to accession number. Phenology: flowering.

U.S.A., Montana: Beartooth National Forest; Rock Creek District, Hellroaring Plateau.
South slope; shallow clay loam gravel soil; with Asters, yarrow, castilleja and phlox. Phenology: flowering.

U.S.A., Montana: Lone Mountain.
In alpine rocks. Phenology: flowering.

U.S.A., Montana, Carbon County: Beartooth National Forest.
East slope; shallow loam. Phenology: flowering.

U.S.A., Montana, Gallatin County: Bridger Peak.

U.S.A., Montana, Gallatin County: Bozeman: above Fairy Lake.

Trifolium haydenii ()
U.S.A., Montana: Gallatin National Forest.
No other data. Phenology: flowering.
Lee Marston, 60. //.

U.S.A., Montana, Sweet Grass County: Gallatin National Forest; North Meatrack Basin.
Slope 45 percent, south exposure; rocky sandy loam; cirque wall; with arnica, senecio, poa epilis, carex. Phenology: flowering.

U.S.A., Montana, Madison County: Madison National Forest: Madison Range: head of Middle Fork Bear Creek.
South slope; shallow clay loam and coarse gravel soil; with white clover 60%, bunchgrass 20%, phlox 10%, other species 10%. Phenology: flowering.
Homer C. Bosworth, 34. 8/3/1923.

U.S.A., Montana, Carbon County: Beartooth Mountains: Custer National Forest: top of Line Creek Plateau, ca 5-7.5 air mi NE of Beartooth Pass, ca 12-13 air mi SSW of Red Lodge.
Alpine meadows and talus. Phenology: flowering & fruiting.
Accession: (unaccessioned), Barcode: USFS0048234

U.S.A., Montana, Carbon County: Beartooth Mountains: Custer National Forest: western edge of the Line Creek Plateau, E of U.S. Hwy 212 (Beartooth Highway), ca 13 air mi SW of Red Lodge.
Steep west-facing slope with talus fields and patchy vegetation. Phenology: flowering.
Accession: (unaccessioned), Barcode: USFS0048087

U.S.A., Wyoming, Park County: Absaroka Range: North Fork Shoshone River Drainage: slopes on south side of summit rim of Clayton Mountain and northernmost end of saddle connecting Clayton and Double Mountain, ca 1.1 mi E of East Fork Blackwater Creek, 3.2 mi S of U.S. Hwy 14, 16 & 20.
West-facing slopes of Engelmann spruce/whitebark pine on reddish, thin sandy-clay andesite volcanic soil, understory dominated by Trifolium patches. Phenology: flowering.

U.S.A, Idaho, Lemhi County: Salmon National Forest: Beaverhead Mountains: Long Canyon, north of Baldy Mountain, 14.2 air mi ESE of Leadore.
Dominant population in xeric soil within a forb dominated vegetation, 11 degree slope, N aspect, limestone geology. Phenology: flowering.
Accession: RM (unaccessioned)

U.S.A, Idaho, Lemhi County: Targhee National Forest: Lemhi Range: upper Bell Mountain Canyon, 30.9 air mi SSE of Leadore.
Dominant population in xeric soil within a whitebark pine vegetation, 4 degree slope, N aspect, alluvial geology. Phenology: flowering.
with Jessica Macy

U.S.A., Montana, Madison County: Madison Range: Lee Metcalf Wilderness, Taylor-Hilgard Unit: ridge NE of Cradle Lakes, at head of Papoose Creek, ca 35 air mi SSE of Ennis, ca 3-4 air mi NW of Earthquake Lake.
Rocky, alpine slopes. Phenology: flowering.
Annotations:
1. Trifolium haydenii Porter.
with Nicholas P. Freeland

U.S.A., Montana, Madison County: Madison Range: along the border of the Lee Metcalf Wilderness, Taylor-Hilgard Unit: Lone Mountain and ridge to the SW of the summit, ca 15 air mi ESE of Ennis, ca 2-2.5 air mi WSW of Big Sky Mountain Village.
Rocky, alpine ridge. Phenology: flowering & fruiting.
Annotations:
1. Trifolium haydenii Porter.

Trifolium haydenii var. barnebyi (1947)
Trifolium haydenii Porter var. barnebyi Isely
U.S.A., Wyoming, Fremont County: 10 mi. S of Perrin.
Ledges of sandstone rocks. Phenology: flowering & fruiting.
Type Specimen: Isotype for Trifolium haydenii Porter var. barnebyi Isely. Brittonia 32: 56. 1980.
3. Trifolium haydenii Porter var. barnebyi Isely.
2. Trifolium gymnocarpon Nutt.
Annotated by J. M. Gillett in 1971. ssp. gymnocarpon ined.
1. Trifolium haydenii Porter.
with R. C. Barneby