Bidens cernua (2002)
ASTERACEAE
Bidens cernua L.
U.S.A., Wyoming, Niobrara County: Thunder Basin National Grassland and Vicinity: Sage Creek on County Road 64, ca 14 air mi NNE of Lusk; ca 19 air mi NE of Manville.
Elev. 4420 ft.
Creek, among cattail marsh. Phenology: flowering.
Accession: RM (unaccessioned)

Bidens cernua (1986)
ASTERACEAE
Bidens cernua L.
U.S.A., Wyoming, Park County: North Fork Shoshone River Drainage: Absaroka Mountains: immediately N of U.S. Hwy 14, 16, & 20, ca 0.5 mi W of the mouth of Libby Creek.
Elev. 6490 ft.
In wet area along highway.
Accession: RM 726439, Barcode: RM0044609

Bidens cernua (1986)
ASTERACEAE
Bidens cernua L.
U.S.A., Wyoming, Park County: North Fork Shoshone River Drainage: Absaroka Mountains: along north side of North Fork Shoshone River, ca 1/8 mi W of Newton Creek Campground.
Elev. 6200 ft.
Disturbed riparian community along river.
Accession: RM 726625, Barcode: RM0044608

U.S.A., Wyoming, Lincoln County: Wyoming Range: Greys River Drainage: along Little Greys River 2.2 mi SE of McCain Meadows, ca 17 air mi ENE of Etna; ca 25.5 air mi NE of Afton.
In saturated silty soil on margin of extremely boggy pond. Stems erect to 32in long. Phenology: flowering.
Accession: RM 723974, Barcode: RM0273953

U.S.A., Wyoming, Laramie County: Southeastern Plains: along Horse Creek.
T18N R64W S23
Riparian. Phenology: flowering.
with Eric Hazlett
Accession: (unaccessioned)

U.S.A., Wyoming, Big Horn County: Yellowtail Wildlife Management Area: Yellowtail Reservoir.
Uncommon on wetland levee built in reservoir, on gravelly muck. Occurs with Polygonum persicaria, Echinochloa muricata, Agrostis scabra. Phenology: flowering & fruiting.

U.S.A., Wyoming, Laramie County: Southeastern Plains: Sprager Creek, ca 6 mi NW of Midway.
Tall stand of Scirpus validus with scattered patches of Leersia and Eleocharis sp. on hummocky streambed associated with small seeps. Phenology: flowering & fruiting.

U.S.A., Wyoming, Laramie County: Southeast Plains: North Branch Little Bear Creek, ca 25 air mi N of Cheyenne; ca 6 mi W of I-25.
Dense Juncus balticus stand with some Agrostis stolonifera and scattered forbs on terrace slightly above floodplain. Phenology: flowering & fruiting.

U.S.A., Wyoming, Platte County: Southeast Plains: Little Cottonwood Draw, ca 5 air mi E of the Laramie Power Station SE of the Greyrocks Road.
Dense Carex nebrascensis/Scirpus pungens community in stream channel on silty soil. Phenology: flowering.

U.S.A., Wyoming, Platte County: Southeastern Plains: Cooney Creek, near Cooney Hills Road, ca 5.5 mi SW of junction with Palmer Canyon Road SW of Wheatland.
Salix exigua/S. amygdaloides community on fine sandy alluvium with patches of coarse sand and gravel in floodplain; understory with Echinochloa muricata, Agrostis stolonifera, Polypogon monspeliensis, and Asclepis sp. Phenology: flowering & fruiting.

U.S.A., Wyoming, Laramie County: Southeastern Plains: F. E. Warren Air Force Base: banks of Diamond Creek, ca 0.15 mi upstream of confluence with Crow Creek on the west side of Cheyenne.
41.149° N, 104.8681° W; NAD 83, uncertainty 700 ft., Nat. Geog. TOPO!
Floodplain terrace with dense cover of Juncus balticus, Agrostis stolonifera, and Cirsium arvense on gravelly alluvium. Phenology: flowering & fruiting.
with Bonnie Heidel, and Scott Laursen

U.S.A., Nebraska, Sioux County: Oglala National Grassland and Vicinity: ca 6-6.5 air mi NW of Crawford, Little Cottonwood Creek.
In creek of actively flowing water.. Phenology: flowering & fruiting.
Accession: RM (unaccessioned)

U.S.A., South Dakota, Pennington County: Buffalo Gap National Grassland and Vicinity: ca 22 air mi ENE of Hermosa and 1 mi W of Swinehart Hill on Rapid Creek.
On banks of creek. Phenology: flowering & fruiting.
Accession: RM (unaccessioned)

U.S.A., Nebraska, Sioux County: Oglala National Grassland and Vicinity: ca 13 air mi NW of Crawford at the Hudson-Meng Bonebed archeological site.
On slopes and drainage of a natural spring, soils are loamy sand. Phenology: flowering & fruiting.
Accession: RM 957381

U.S.A., New Mexico, Colfax County: Carson National Forest and Vicinity: Eagle Nest Lake State Park: Moreno Day Use Area, on south side of U.S. Hwy 64, ca 3/4 air mi SSE fo Eagle Nest.
Along north shore of reservoir with Hordeum jubatum, Verbascum thapsis, and Cirsium arvense. Phenology: flowering.

U.S.A., Colorado, Jefferson County: Ward Road Ponds, between 48th Avenue and the junction of I-70 and Ward Road. Golden Quad.
T3S R69W S20
Occasional, next to pond shore under willow ssp. Phenology: flowering.
with Stanley Smookler
Accession: RM 745058

U.S.A., Wyoming, Sublette County: Wetlands and Adjacent Areas: East Fork River, ca 15 air mi SE of Pinedale.
Moist banks and flood plains. Phenology: flowering & fruiting.

U.S.A., Washington, Thurston County: N end of Black Lake, 3 mi SE of Olympia.
Partly submerged at end of lake. Phenology: flowering & fruiting.
Accession: RM 189830

U.S.A., Washington, Snohomish County: Marysville.
Tide lands. Phenology: flowering & fruiting.

U.S.A., Oregon, Klamath County: 1 mi S of 44 Keamoth.
Phenology: flowering & fruiting.

U.S.A., Oregon, Klamath County: Rogue River National Forest (Crater): Klamath Lake.
Grows in swamps with aquatic plants and Tule. Phenology: flowering & fruiting.
Accession: USFS 474579

U.S.A., Washtington, Klickitat County: Bingen.
Wet places on bottom-land. Phenology: flowering & fruiting.

U.S.A., Wyoming, Albany County: Laramie River near Bluegrass tunnel.
41.92° N, 105.4245° W; NAD 83, uncertainty 1 mi., Digital Map
Marsh on the river. Rays present. Phenology: flowering & fruiting.

U.S.A., Wyoming, Laramie County: Near Pine Bluffs, on Spring Creek.
41.1987° N, 104.0817° W; NAD 83, uncertainty 0.75 mi., Digital Map
Abundant, wet stream bank. Phenology: flowering.
with Marjorie W. Porter

U.S.A., Wyoming, Albany County: Laramie Range: Pole Mountain Region: North Fork Pole Creek.
41.2812° N, 105.3281° W; NAD 83, uncertainty 2 mi., Digital Map
Muddy shore of a beaver pond. Phenology: flowering & fruiting.
with Marjorie W. Porter

U.S.A., Wyoming, Carbon County: Platte Canyon.
Phenology: flowering.

U.S.A., Wyoming, Carbon County: Platte Canyon.
In the margin of marshes. Phenology: flowering.

U.S.A., Wyoming, Platte County: Wheatland.
Phenology: flowering.

U.S.A., Arizona, Apache County: Near the Apache National Forest: Hayrock Ranch.
T10N R28E S8
Moderate east slope: alkali peat bog: common in meadow with saltgrass and Juncus. Phenology: flowering.
Annotations:
Annotated by Ronald R. Weedon in 1971.
Accession: USFS 474592

U.S.A., Wyoming, Park County: Absaroka Mountains: North Fork Shoshone River Drainage: below Fire Fighter's Memorial opposite Blackwater Creek.
Growing along water. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Absaroka Mountains: North Fork Shoshone River Drainage: along the river, at UXU Lodge, ca 34 mi W of Cody.
In wet area. Phenology: fruiting.

U.S.A., Wyoming, Johnson County: Buffalo.
Phenology: flowering.

U.S.A., Wyoming, Niobrara County: S of Lusk.

U.S.A., Wyoming, Platte County: Laramie River, 12 road mi NE of Wheatland.
South bank of river. Phenology: flowering & fruiting.

U.S.A., Wyoming, Platte County: North Platte River: S of U.S. Hwy 26, 0.5 road mi S of Guernsey.

U.S.A., Wyoming, Platte County: Between Fish Creek and Fish Creek Road, 18 road mi NW of Wheatland.
Stock ponds and drainage of ponds. Phenology: flowering.

U.S.A., Wyoming, Albany County: Laramie Range: Medicine Bow National Forest: Pole Mountain District: W of Eagle Rock, along the North Branch Middle Fork Lodgepole Creek.
Moist bottomland along the creek; common in late summer along the muddy edges of the beaver ponds. Phenology: flowering & fruiting.

U.S.A., Wyoming, Washakie County: Lower Canyon Creek.
44.0618° N, 107.3829° W; NAD 83, uncertainty 0.75 mi., Digital Map
In the edge of a pond. Phenology: flowering.
Leslie N. Goodding, 495. 8/6/1901.

U.S.A., Wyoming, Albany County: Medicine Bow National Forest: North Fork Middle Lodgepole Creek.
T15N R71W
Swampy areas in bed of creek. Phenology: flowering.

U.S.A., Wyoming, Goshen County: 2 mi E of Torrington.
Shallow water of stream with Sagittaria, Lemna. Plants 1m high; flowers yellow. Phenology: flowering.

U.S.A., Wyoming, Albany County: 9 mi SE of Laramie.
Edge of beaver pond with Carex, Veronica. Phenology: flowering.

U.S.A., Wyoming, Converse County: 13 mi SE of Glenrock.
Spring with Ranunculus, Lemna. Phenology: flowering & fruiting.

U.S.A., Wyoming, Big Horn County: 8-9 mi W of Basin along the Greybull River.
Common in riparian zone near reservoir. Phenology: flowering & fruiting.
with Valerie Schreibeis

U.S.A., Wyoming, Albany County: Ca 25 mi SW of Wheatland, on Nueces Ranch, along ranch road to headquarters.
In mud at edge of pond. Rays yellow. Phenology: flowering.

U.S.A., Wyoming, Fremont County: Flood plain of Little Wind River: 1 mi 255 degrees from Arapahoe, 15 mi 53 degrees from Lander.
In ephemeral channels of the river; silty, sandy, slightly saline soil. Phenology: flowering & fruiting.

U.S.A., Wyoming, Sheridan County: Middle Little Goose Creek.
Swampy soil. Phenology: flowering.

U.S.A., Wyoming, Sheridan County: East pasture swamp.
Swamps and stream banks. Phenology: flowering.

U.S.A., Wyoming, Teton County: Grand Teton National Park: Swan Lake.
T45N R115W S2
Partly submerged in lake. Phenology: flowering.

U.S.A., Wyoming, Lincoln County: Northern Wyoming Range: southeast shore of Baily Lake, ca 14 air mi E of Alpine.
Edge of trail in sandy, disturbed soil. Phenology: flowering.

U.S.A., Wyoming, Albany County: Laramie Range: Vedauwoo Glenn, adjacent to small stream ca 0.5 mi E of I-80, ca 14 air mi SE of Laramie.
Wet, muddy banks of small beaver pond surrounded by willow thicket. Phenology: flowering & fruiting.
with Jane Struttmann

U.S.A., Wyoming, Laramie County: Southeastern Plains: F. E. Warren Air Force Base: bank of Crow Creek, ca 0.5 mi N of confluence with Diamond Creek, Cheyenne.
Edge of cattail-bulrush thicket on muddy banks of creek with Polygonum. Phenology: flowering.

U.S.A., Wyoming, Teton County: Jackson Hole: south bank of Nowlin Pond #4, ca 0.5 mi N of north end of Millers Butte, 1 mi E of U.S. Hwy 26/89/187, 3 mi N of Jackson.
Muddy banks with Lemna and Utricularia intermedia. Phenology: flowering.

U.S.A., New Mexico, Sandoval County: Valles Caldera National Preserve: Jemez Mountains: San Antonio Hot Springs, hillside above, vicinity of buildings, and 0.5 air mi down San Antonio Creek.
Streamside, rocky slopes, roadsides. Phenology: flowering.

U.S.A., Wyoming, Teton County: Grand Teton National Park and Vicinity: Jackson Hole: at Kelly Warm Springs, ca 5 air mi E of Moose; ca 14 air mi NE of Jackson.
Banks of warm springs. Phenology: flowering & fruiting.
Annotations:
1. Bidens cernua L.
Annotated by David Scott.

U.S.A., Wyoming, Teton County: Targhee National Forest: Ashton Ranger District: Loon Lake.
Thick sphagnum shore line; Drosera common on north side. Phenology: flowering & fruiting.
Annotations:
1. Bidens cernua L.
Annotated by David Scott.

U.S.A., Wyoming, Teton County: Targhee National Forest: Ashton Ranger District: Indian Lake, at outlet.
Lake shore. Phenology: flowering & fruiting.
1. Bidens cernua L.
Annotated by David Scott.

U.S.A., Wyoming, Teton County: Targhee National Forest: Ashton Ranger District: at Tillery Lake, ca 9 air mi WNW of Flagg Ranch; ca 26.5 air mi NW of Moran.
Small stream in mixed conifer forest. Phenology: flowering.
with David Scott

U.S.A., Wyoming, Teton County: Targhee National Forest: Ashton Ranger District: Winegar Hole Wilderness: SE of Rock Lake.
Wetlands. Phenology: flowering.

U.S.A., Wyoming, Teton County: Targhee National Forest: Ashton Ranger District: Winegar Hole Wilderness: E of Rock Lake to Rock Lake.
Wetlands with excellent peat development. Phenology: flowering & fruiting.

U.S.A., Wyoming, Teton County: Targhee National Forest: Ashton Ranger District: Winegar Hole Wilderness: from Rock Lake NW towards Winegar Creek.
Wetlands. Phenology: flowering & fruiting.

U.S.A., South Dakota, Custer County: Custer.
T3S R4E S26
Common along streams. Phenology: flowering.

U.S.A., South Dakota, Custer County: Custer State Park: French Creek.
T4S R6E S10 NW1/4
Wet sand. Phenology: flowering.
Arthur C. McIntosh, 543. 8/1/1924.

U.S.A., South Dakota, Custer County: Custer: Buckhorn Mountain.
T3S R4E S14
Along railroad. Phenology: flowering.
Arthur C. McIntosh, A177. 8/3/1924.

U.S.A., South Dakota, Bennett County: Lacreek National Wildlife Refuge.
Marsh and associated habitats. Phenology: flowering.

U.S.A., South Dakota, Custer County: Black Hills: Black Elk Wilderness: east side of Trail #7 beside tributary to Grizzly Bear Creek, ca 4.3 air mi SW of Keystone, ca 2.8 air mi S of Horsethief Lake.
T2S R5E S26 SE1/4 of NE1/4
Ponderosa pine; open wet area beside creek. Phenology: flowering.

U.S.A., South Dakota, Custer County: Black Hills: Black Elk Wilderness: east side of Trail #7 beside tributary to Grizzly Bear Creek, ca 4.3 air mi SW of Keystone, ca 2.8 air mi S of Horsethief Lake.
Ponderosa pine; open wet area beside creek. Phenology: flowering.

U.S.A., New Mexico, Sandoval County: Valles Caldera National Preserve: Valle Grande, southeast end below NM Hwy 4 near where road enters meadow and vicinity. Cattle pond spring 8606 visible from road, as blue hole.
0E, 0N
Edges of spring and spring fed cattle pond in open meadow on gentle slope. Phenology: flowering & fruiting.

U.S.A., South Dakota, Bennett County: Lacreek National Wildlife Refuge.
Marsh and associated habitats. Phenology: flowering.
Michael R. Broschart, s.n.. 9/3/1982.

U.S.A., South Dakota, Custer County: Harney National Forest.
Level slope; deep loam soil; creekbank vegetation bank; wet soil distriubtion. Sparse. ELEVSTR: 5270 5470 f (USGS 7.5') G. Bryson RMH Phenology: flowering.
Accession: USFS 474583, Barcode: USFS0071288

U.S.A., South Dakota, Custer County: Harney National Forest.
Streambank vegetation type; wet soil distribution; sparse. Phenology: flowering.
Accession: USFS 474582, Barcode: USFS0071289

U.S.A., South Dakota, Perkins County: Bixby.
T14N R13E S29
Annotated by Ronald R. Weedon in 1971.

U.S.A., South Dakota, Pennington County: Pactola.
Along springs. Phenology: flowering.

U.S.A., South Dakota, Fall River County: Edgemont.
T9S R2E S1
Around springs. Phenology: flowering.

U.S.A., Colorado, Larimer County: Tobe Millers Ranch.
Annotated by Ronald R. Weedon in 1971.

U.S.A., Colorado, Larimer County: Phantom Canyon Preserve, ca 25 mi N of Fort Collins: along U.S. Hwy 287, along unnamed stream ca 0.5 mi W of preserve gate at highway.
Elev. 1981 m.

U.S.A., New Mexico, Santa Fe County: Near Santa Fe.
Moist roadside, in water. Phenology: flowering.
1.
Annotated by Ruth Ashton Nelson in 1971.

U.S.A., Colorado, no county County: Central Colorado.
Phenology: flowering & fruiting.
Earl L. Johnston, 519. //1907.

U.S.A., Colorado, Denver County: Denver.
Phenology: flowering & fruiting.
Ellsworth Bethel, 06. 8/29/1916.

U.S.A., Colorado, Alamosa County: Alamosa.
In ditch from artesian well. Phenology: flowering & fruiting.

U.S.A., Colorado, Boulder County: North Boulder.

U.S.A., Colorado, Boulder County: Mouth of Gregory Canyon.

U.S.A., Colorado, Boulder County: Near Boulder.

U.S.A., Colorado, Larimer County: Near Fort Collins.
George E. Osterhout, 250. 8/31/1894.

U.S.A., Colorado, Weld County: Windsor.
George E. Osterhout, 4839. 9/5/1912.

U.S.A., Colorado, Weld County: New Windsor: river.
George E. Osterhout, 966. 8/15/1896.

U.S.A., Colorado, Weld County: Windsor.
Annotated by B. E. Nelson in 1979.
George E. Osterhout, s.n.. 9/8/1911.

Bidens cernua ()
U.S.A., Colorado, Larimer County: Estes Park.
Annotated by Harold D. Harrington in 1950.
Milo S. Baker, 4704. //.

U.S.A., Colorado, Weld County: US Hwy 34, 3.0 mi W of 65th Avenue in Greeley.
Elev. 1445 m.
Disturbed roadside ditch. Phenology: flowering & fruiting.
with S. Parker

U.S.A., Colorado, Larimer County: Fort Collins: E of Roundhouse.
5% east slope, deep muck, swamp. Phenology: flowering.
Annotated by S. F. Blake.
Accession: USFS 474581

U.S.A., Colorado, Baca County: W of Kirkwell on road M: slough in East Carrizo Creek drainage.
T33S R50W S27

U.S.A., Colorado, Weld County:
T10N R66W S24
Swale, clay loam. Phenology: flowering.

U.S.A., Colorado, Las Animas County: Mesa de Maya Region: Cottonwood Creek.
Pinyon-juniper/oak woodlands, moist site by stream. Phenology: flowering.
with Dina Clark and Rick Brune

U.S.A., Colorado, Boulder County: Flaggstaff Mountain.

U.S.A., Colorado, Saguache County: Cochetopa National Forest: Gottelf Meadows.
Level, gravelly soil. Phenology: flowering.
William O. Sander, 5A. 7/13/1916.

U.S.A., Idaho, Fremont County: Targhee National Forest: Island Park Plateau: E of U.S. Hwy 20, ca 1.5 air mi NE of Island Park Dam.
T13N R43E S22
Roadside swamp, mostly Typha, Salix, and Carex.
Accession: (unaccessioned)

U.S.A., Colorado, Rio Blanco County: Flat Tops/White River Plateau: Sterry Lake, ca 16 air mi SE of Meeker.
Drying lake margins.
James P. Vanderhorst, 1978. 8/27/1990.
Accession: (unaccessioned)

U.S.A., Washington, Stevens County: Western Colville National Forest and Vicinity: Cottonwood Creek Drainage: ca 9 air mi SE of Chewelah along Forest roads 4342 and 250.
Carex meadows with old and sporadically active beaver dams; ponderosa pine and lodgepole pine on flats; spruce and Douglas fir on slopes. Phenology: flowering & fruiting.

U.S.A., Washington, Stevens County: Western Colville National Forest and Vicinity: Little Pend Oreille Wildlife Refuge: McDowell Lake, ca 11 air mi SE of Colville along Rookery Road.
Lake edge and bottom; along source creek; Carex and alders. Phenology: flowering.

U.S.A., Wyoming, Teton County: Wyoming/Salt River Ranges: Wyoming Range: Willow Creek Drainage: ca 0.5 air mi ENE of Anns Peak, ca 5 air mi SE of Hoback Junction, ca 16 air mi SE of Jackson.
Growing on floating logs in large pond. Phenology: flowering.

U.S.A., Wyoming, Lincoln County: [location and coordinates withheld]
Streamside and wetlands and roadside. Phenology: flowering & fruiting.

U.S.A., Wyoming, Lincoln County: [location and coordinates withheld]
Streamside and adjacent uplands. Phenology: flowering & fruiting.

U.S.A., Wyoming, Lincoln County: [location and coordinates withheld]
Riverside and marshy meadows. Phenology: flowering & fruiting.

Stream banks and roadside. Phenology: flowering.

U.S.A., Wyoming, Niobrara County: [location and coordinates withheld]
Forming large mats of vegetation in stream and marsh. Phenology: flowering & fruiting.

U.S.A., Wyoming, Goshen County: Southern Powder River Basin/Southeastern Plains: Southeastern Plains: ca 3 air mi W of La Grange, ca 30 air mi S of Torrington on Wyo Hwy 151, along Bear Creek.
In sandy clay on sand bar with Veronica and Polypogon. Common. Phenology: flowering & fruiting.

U.S.A., Wyoming, Goshen County: Southern Powder River Basin/Southeastern Plains: Southeastern Plains: Goshen Hole: Hawk Springs Reservoir, ca 6.5 air mi SE of Hawk Springs; ca 25 air mi S of Torrington.
On dry ground left by receding reservoir with Cyperus, Eragrostis, and Gnaphalium. Common. Phenology: flowering & fruiting.

U.S.A., Wyoming, Platte County: Southern Powder River Basin/Southeastern Plains: Southeastern Plains: ca 4.5 air mi NNE of Wheatland on Wyo Hwy 320, along Laramie River.
Common in sandy clay on sand bar with Veronica and Chenopodium. Phenology: flowering & fruiting.

U.S.A., Wyoming, Big Horn County: Bighorn Basin: along the Big Horn River, S of Yellowstone Reservoir, ca 11-11.5 air mi SE of Lovell, ca 21 air mi NNW of Greybull.
River bank. Phenology: flowering.

U.S.A., Wyoming, Hot Springs County: Bighorn Basin: along the Big Horn River, ca 7 air mi NNE of Thermopolis; ca 1 air mi ENE of Lucerne.
On mud flats along an overflow channel. Phenology: flowering.

U.S.A., Wyoming, Platte County: Hartville Uplift: Patten Creek, ca 16 air mi SSE of Glendo.
Margins of deep pools in creek, wet sedge meadows, cutbanks, ponderosa pine slopes, little bluestem grassland on hilltops and slopes, silver sage grassland above creek; meadows. Phenology: flowering & fruiting.

U.S.A., Wyoming, Laramie County: [location and coordinates withheld]
Gravel bars, edge of creek, and marshy areas. Phenology: flowering & fruiting.

U.S.A., Wyoming, Niobrara County: Southern Powder River Basin/Southeastern Plains: Southern Powder River Basin: along Indian Creek off Hat Creek or County Road 64, ca 16 air mi NE of Lusk; ca 19.8 air mi NW of Van Tassell.
Edge of the stream and marshy areas. Phenology: flowering & fruiting.

U.S.A., Wyoming, Laramie County: [location and coordinates withheld]
Sand bars and moist creek bank. Phenology: flowering & fruiting.

U.S.A., Wyoming, Goshen County: Southern Powder River Basin/Southeastern Plains: Southeastern Plains: along Horse Creek and adjacent plains W of County Road 191, ca 4 air mi S of La Grange; ca 34 air mi S of Torrington.
Sand bars and edge of creek. Phenology: flowering & fruiting.

U.S.A., Wyoming, Goshen County: [location and coordinates withheld]
Along the edge of a small stream channel through cottonwood-Russian olive-buffalo berry woodland. Phenology: flowering & fruiting.

U.S.A., Wyoming, Platte County: Southern Powder River Basin/Southeastern Plains: Southeastern Plains: along the North Platte River above River Canyon in the upper end of Glendo Reservoir, ca 7.3 air mi NNW of Glendo, ca 29 air mi NW of Guernsey.
Mud flats along the river and old reservoir bottom. Phenology: fruiting.

U.S.A., Wyoming, Platte County: Southern Powder River Basin/Southeastern Plains: Southeastern Plains: along the Laramie River above and below Chugwater Creek and along Chugwater Creek, ca 7.5 air mi NE of Wheatland.
Riparian benches, streambanks and adjacent meadows. Phenology: flowering.
with Tim Chumley and Robbin Romberg

U.S.A., Wyoming, Platte County: Southern Powder River Basin/Southeastern Plains: Southeastern Plains: along the Laramie River above and below Chugwater Creek and along Chugwater Creek, ca 7.5 air mi NE of Wheatland.
Riparian benches, streambanks and adjacent meadows. Phenology: flowering & fruiting.
with Tim Chumley and Robbin Romberg

U.S.A., Wyoming, Niobrara County: Southern Powder River Basin/Southeastern Plains: Southeastern Plains: along Muddy Creek off Spanish Diggings or County Road 34 ca 3 air mi E of Converse County, ca 13.8 air mi SW of Manville, ca 20.5 air mi WSW of Lusk.
Marshy areas in the stream channel. Phenology: flowering & fruiting.

U.S.A., Wyoming, Goshen County: Southern Powder River Basin/Southeastern Plains: Southeastern Plains: Fort Laramie National Historic Site: along the Laramie River, ca 1.3 air mi SSW of Fort Laramie (town); ca 21 air mi NW of Torrington.
Gravelly sand bars and river margin. Phenology: flowering.

U.S.A., Wyoming, Converse County: 13 mi SE of Glenrock.
Spring with Ranunculus and Lemna.

U.S.A., Wyoming, Sublette County: Green River Basin: Boulder Creek, 0.5 air mi NW of Boulder.
Streamside, marshy areas, and beneath Populus angustifolia. Phenology: flowering & fruiting.
with Tom Cramer

U.S.A., Wyoming, Laramie County: Laramie Mountains: along Crow Creek W of County Road 109, ca 18 air mi W of Cheyenne; ca 11.1 air mi NE of Buford.
On shores of spring-fed pond surrounded by willow thickets. Phenology: flowering.

U.S.A., Wyoming, Laramie County: Southern Powder River Basin/Southeastern Plains: Southeastern Plains: along Crow Creek E of County Road 217 ca 1/2 mi, ca 16.2 air mi ESE of Cheyenne.
Along creek. Phenology: flowering.

U.S.A., Wyoming, Goshen County: Southern Powder River Basin/Southeastern Plains: Goshen Hole: along Horse Creek between County Road 180 and County Road 182, ca 1/2 air mi E of Hawk Springs, ca 19.3 air mi SSW of Torrington.
41.791° N, 104.2552° W; NAD 83, uncertainty 0.5 mi., Nat. Geog. TOPO!
Along open banks of creek, in grazed pasture and along irrigation ditches in the pasture. Phenology: flowering.

U.S.A., Wyoming, Laramie County: Laramie Mountains: along South Fork Bear Creek E from Bristol Ridge or County Road 237, ca 27 air mi NNW of Cheyenne.
Dry flats above the creek. Phenology: flowering.

U.S.A., Wyoming, Sublette County: Green River Basin: Green River, ca 9 air mi S of Big Piney.
Riverside meadows, sagebrush, and sagebrush bluff. Phenology: flowering.
with Ben and Becky Cramer

U.S.A., Wyoming, Sublette County: Green River Basin: New Fork River, ca 10 air mi E of Big Piney.
Riverside meadows, willows, and sagebrush. Phenology: flowering & fruiting.
with Ronald L. Hartman

U.S.A., Wyoming, Lincoln County: Green River Basin: Green River, ca 6 air mi S of La Barge.
Riverside meadows and willows. Phenology: flowering.
with Ronald L. Hartman

U.S.A., Wyoming, Sublette County: Green River Basin: New Fork River, ca 3 air mi WNW of Boulder.
Riverside meadows, willows and cottonwoods, stagnant ponds, irrigation ditchsides, and piney bluffside. Phenology: flowering.

U.S.A., Wyoming, Crook County: Black Hills: Bear Lodge Mountains: at the mouth of Twomile Creek on North Redwater Creek, ca 4.3 air mi W of Farrall, ca 12.5 air mi N of Sundance.
Edge of stream and sand bars. Phenology: flowering & fruiting.

U.S.A., Wyoming, Crook County: Black Hills: Bear Lodge Mountains: Planting Spring, ca 2.4 air mi E of Alva, ca 10.4 air mi E of Hulett.
Drained beaver ponds. Phenology: flowering & fruiting.

U.S.A., Wyoming, Crook County: Black Hills, Bear Lodge Mountains, Lytle Creek Reservoir, ca 2 air mi E of Devils Tower.
Margins of reservoir. Phenology: flowering & fruiting.

U.S.A., Wyoming, Crook County: Black Hills: Bear Lodge Mountains: headwaters of Lame Jones Creek, ca 7 air mi S of Alva.
Wet meadows and old beaver ponds. Phenology: flowering & fruiting.

U.S.A., Wyoming, Crook County: Black Hills: Houston Creek where it turns south (near Harvey Divide), ca 10 air mi W of Sundance.
Grassland, reservoir margins. Phenology: flowering & fruiting.

U.S.A., Wyoming, Crook County: Black Hills: Belle Fourche River near Mona, ca 14.5 air mi NNE of Hulett.
On mud along river. Phenology: flowering & fruiting.

U.S.A., Wyoming, Weston County: Black Hills: West Plum Creek ca 4 mi N of confluence with East Plum Creek, ca 11 air mi NNW of Newcastle.
On mud around reservoir (in grassland). Phenology: flowering & fruiting.

U.S.A., Wyoming, Weston County: [location and coordinates withheld]
On dried mud around reservoir. Phenology: flowering & fruiting.

U.S.A., Wyoming, Crook County: Black Hills: Inyan Kara Mountain (east half); ca 13.5 air mi S of Sundance.
Reservoir in grassland east of mountain, on mud. Phenology: flowering & fruiting.

U.S.A., Wyoming, Crook County: Devils Tower, Little Missouri Buttes.

U.S.A., New Mexico, Colfax County: Vermejo Park Ranch: pond on south side of Vermejo River in Vermejo Park just W of employee housing area; 1.6 air mi WNW of Casa Grande.
Shallow muddy pond in old river oxbow, with Juncus spp., Sparganium emersum, Potamogeton spp., Carex spp. Heads discoid, yellow; plants scattered in saturated soil or shallow water. Photographed. Phenology: flowering.
Annotated by Ben Legler on 2/16/2008.

U.S.A., Montana, Carter County: Custer National Forest: Long Pines: in Cheesman Draw, just NE of Pioneer Cemetery off of Forest Road 3045, ca 8.5 air mi WNW of Camp Cook, SD.
In and near margin of reservoir. Phenology: flowering.
Accession: USFS 883293, Barcode: USFS0049119

U.S.A., Montana, Carter County: Custer National Forest: Ekalaka Hills: in and around McNab Pond, at terminus of Forest Road 1401, ca 0.5 air mi NE of Mont Hwy 323, ca 7 air mi SE of Ekalaka.
In and around pond dominated by Scirpus and Typha spp. and grasses on its margin. Phenology: flowering.
with G. Gust

U.S.A., Wyoming, Niobrara County: Near mouth of Van Tassell Creek, E of Van Tassell.
Cattail marsh, with Lycopus, Mentha. Flower color rays yellow, 1.5m high. Phenology: flowering.

U.S.A., Montana, Gallatin County: Bozeman: Experimental Farm.

U.S.A., Montana, Missoula County: 2.5 mi N of the Florence-Carlton Church at the end of former Hwy 93.
Elev. 3170
In ditches and other vernally wet places. Common. Phenology: flowering.
Klaus H. Lackschewitz, 6969. 9/7/1976.

U.S.A., Montana, Ravalli County: Bitterroot Mountains: Bitterroot River near inlet of Bass Creek.
In a ditch. Common. Phenology: flowering.
Klaus H. Lackschewitz, 6932. 8/27/1976.

U.S.A., Montana, Missoula County: Blackfoot Valley: Seeley Lake: near Knopp place.

U.S.A., Montana, Lincoln County: Kootenai National Forest: Crystal Lake.
Edge of lake with sedges and Juncus; moist places. Common. Phenology: flowering.

U.S.A., Montana, Lincoln County: Kootenai National Forest: edge of Loon Lake.
Wet loam at edge of lake with sedges and Juncus; in the sun. Rare. Phenology: flowering.

U.S.A., Montana, Ravalli County: Bitterroot National Forest: north side of McClain Creek.
Slope 20%, east exposure; sandy loam soil; with leafy spurge, Penstemon, brome, Asters. Common in patches. Phenology: fruiting.

U.S.A., Montana, Madison County: Gallatin National Forest: near McAllister.
Level ground; moist slough; with Sium; edge road, in creek. Rare. Phenology: flowering.

U.S.A., Montana: Highway 10 near Manhattan.
Roadside edge of pool; level moist aquatic ground. Rare. Phenology: flowering.

U.S.A., Montana, Gallatin County: On #187 highway west of Bozeman.
Level ground; marshy soil; marsh cover type; roadside. Rare. Phenology: flowering.

U.S.A., Montana, Dawson County: Just above both bridges of the city of Glendive: South bank of the Yellowstone River.
Close to or in shallow water. The most common Bidens sp. present. Phenology: flowering.
Klaus H. Lackschewitz, 9470. 9/16/1980.

U.S.A., Montana, Beaverhead County: North shore of Clark Canyon Reservoir.
Moist area along the immediate water line in muddy soil. Many identical small plants. Phenology: flowering.

U.S.A., Montana, Carter County: Long Pines area of SE Ekalaka.
Wet drainageway with Rannuculus, Veronica. Corolla yellow. Phenology: flowering.

U.S.A., North Dakota, Benson County: Leeds.

U.S.A., North Dakota, Rolette County: Rolla.

U.S.A., North Dakota: Lisbon.

U.S.A., North Dakota, Cass County: Fargo.

U.S.A., Nebraska, Kearney County: Minden.
Harry Hapeman, s.n.. 9/7/1927.

U.S.A., Nebraska, Kearney County: Minden.
Harry Hapeman, s.n.. 9/17/1930.

U.S.A., Nebraska, Kearney County: North of Minden.
Sand pit. Phenology: flowering.
Harry Hapeman, s.n.. 9/11/1943.

U.S.A., Nebraska, Washington County: North of Arlington.
In wet soils. Phenology: flowering.

U.S.A., Nebraska: Platte River: near Newark.
Banks of river. Phenology: flowering.

U.S.A., Nebraska, Kimball County: Along Lodgepole Creek: just east of road dividing sections 11 and 12, 1.7 air mi NNE of Pine Bluffs
Wet meadow, north creek bank in water. Phenology: flowering.

U.S.A., Montana, Phillips County: Charles M. Russell National Wildlife Refuge: along the Missouri River at Jones Island just below Bell Bottoms, ca 12 air mi S of DY Junction, ca 63 air mi SW of Malta.
River bank just above high water line. Phenology: flowering & fruiting.

U.S.A., Montana, Valley County: Along Porcupine Creek at Roosevelt Trail and Fort Peck Indian Reservation, ca 5 air mi N of Nashua.
Muddy stream edge and in adjacent pools. Phenology: flowering & fruiting.

U.S.A., South Dakota, Lawrence County: Black Hills National Forest: fen/wetland along Silver Creek, ca 1 1/4 air mi SE of Nahant.
zone 13N, 601366E, 4891393N; NAD 83, Specimen Label
Growing along flowing creek channel with Betula occidentalis and Carex utriculata in the vicinity. Minnekahta Quad Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Absaroka Mountains: North Fork Shoshone River Drainage: on south side of river, ca 0.3-0.5 mi W of Moss Creek.
Marsh. Phenology: flowering & fruiting.

U.S.A, Idaho, Butte County: Little Lost River Valley: head of Warm Spring Creek at highway crossing, 21.6 air mi NNE of Arco.
<25 plants estimated in hydric soil within herbaceous riparian vegetation, no slope, alluvial geology. Phenology: flowering.

U.S.A., Wyoming, Goshen County: County Road 25 just N of Bear Creek Road, ca 12 mi W of La Grange.
Seepage area, with Populus and Polygonum. Flowers yellow. Phenology: flowering.

U.S.A., Wyoming, Platte County: Camp Guernsey: banks of Deercorn Spring Creek and pond, 2.5 km S of Smith Ranch, 1.1 km NW of confluence of Patten and Deercorn Spring Creek (to form Broom Creek).
Elev. 1481 m.
zone DMC, 518050E, 4696000N; unknown, GPS reading
Level; riparian; sandy to silty loam; with Convolvulus arvensis, Juniperus scopulorum, Agropyron, Carduus, Scirpus spp. Locally common; ascending, fibrous rooted, annual herb; 60-70 cm tall; disk and ray yellow. Phenology: flowering.
Patricia P. Douglas, 609. 8/27/1995.
with Rosalie M. Smith, Nancy E. Hastings

U.S.A., Wyoming, Platte County: Camp Guernsey: spring on Osburn Ranch parcel in Sawmill Canyon; 2.9 km due E of North Platte River, ca 9.2 km NW of Range Control.
Level to sloped; riparian/paulstrine/disturbed; silty loam; with Carduus acanthoides, Juniperus scopulorum, Populus sp., Prunus virginiana, Agrostis stolonifera, Carex spp. Local; ascending to erect, perennial herb; to 4 dm tall; disk yellow; ray yellow. Phenology: flowering.
with P. Block

U.S.A., Wyoming, Platte County: Camp Guernsey: banks of Deercorn Spring Creek and pond, 2.5 km S of Smith Ranch, 1.1 km NW of confluence of Patten and Deercorn Spring Creek (to form Broom Creek).
zone DMC, 518050E, 4696000N; unknown, GPS reading
Level; riparian; sandy to silty loam; with Convolvulus arvensis, Juniperus scopulorum, Agropyron, Carduus, Scirpus spp. Locally common; ascending, fibrous rooted, annual herb; 60-70 cm tall; disk and ray yellow. Phenology: flowering.
Patricia P. Douglas, 609. 8/27/1995.
with Rosalie M. Smith, Nancy E. Hastings