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RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 2553 Peter J. Ebertowski 2002 8 2 214 U.S.A. Wyoming Campbell Thunder Basin National Grassland and Vicinity: Wild Horse Creek on York or Forest Road 900, ca 27 air mi NNE of Gillette; ca 24 air mi N of Rozet. -105.2178 44.6292 1 1207 1234 Creek bank and floodplain. Phenology: flowering. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 3070 Peter J. Ebertowski 2002 8 16 228 U.S.A. Wyoming Weston Thunder Basin National Grassland and Vicinity: Beaver Creek upstream and ca 0.8 air mi W of its confluence with Hay Creek, on Old Highway 85, ca 22 air mi SSE of Newcastle; ca 12.5 air mi NNE of Mule Creek Junction. -104.1125 43.5301 1 1121 1140 Creek bank. Phenology: flowering. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 3541 Peter J. Ebertowski 2002 8 30 242 U.S.A. Wyoming Niobrara 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. -104.3376 42.944 1347 Creek bank. Phenology: flowering. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 6192 Peter J. Ebertowski 2003 7 7 188 U.S.A. Wyoming Weston Thunder Basin National Grassland and Vicinity: tributary of Skull Creek, E of Sunquist Draw, on County Road 14, ca 13 air mi ESE of Upton; ca 15 air mi NE of Newcastle. -104.3896 44.0481 1396 1414 By small dike at ravine outlet. Phenology: flowering. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 8323 Peter J. Ebertowski 2003 8 17 229 U.S.A. Wyoming Weston Thunder Basin National Grassland and Vicinity: Beaver Creek, ca 0.3 mi N of its confluence with South Beaver Creek, off U.S. Hwy 85, ca 16 air mi S of Newcastle; ca 16 air mi N of Mule Creek Junction. -104.1923 43.6151 1140 1161 Creek bank. Phenology: flowering & fruiting. RM RM 819963 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 34601 Erwin F. Evert 1997 8 6 218 U.S.A. Montana Carbon East Bridger, along Burlington Northern tracks E of town. 1106 Disturbed area around grain elevators with Distichlis stricta, Bromus tectorum, and Kochia scoparia. Phenology: flowering & fruiting. RM RM 960971 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 63398 Ronald L. Hartman 1998 8 16 228 U.S.A. New Mexico Colfax NM Hwy 72, 4 road mi E of I-25 (milepost 4). -104.37 36.9193 1 2042 Grassy roadside. Phenology: flowering & fruiting. RM RM 960970 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 63475 Ronald L. Hartman 1998 8 16 228 U.S.A. New Mexico Colfax NM Hwy 72, 11 road mi E of I-25 (milepost 11). -104.2783 36.9219 1 2500 Roadside through wooded area. Phenology: flowering & fruiting. RM RM 345749 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 2254-1 Charles P. Pase 1977 9 28 271 U.S.A. Arizona Greenlee Apache National Forest: Eagle Creek: Honeymoon. [Homeymoon Campground] -109.48099 33.47509 1 1676 Platanus-Juglans riparian community. Phenology: fruiting. RM RM 345719 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 2254-2 Charles P. Pase 1977 9 28 271 U.S.A. Arizona Greenlee Apache National Forest: Eagle Creek: Honeymoon. [Homeymoon Campground] -109.48099 33.47509 1 1676 Platanus-Juglans riparian community. Phenology: fruiting. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 4481 Grace M. Kostel 2004 8 6 219 U.S.A. Nebraska Sioux Oglala National Grassland and Vicinity: ca 6-6.5 air mi NW of Crawford, Little Cottonwood Creek. -103.501167 42.757333 1158 In creek of actively flowing water.. Phenology: flowering. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 9096 Grace M. Kostel 2005 7 22 203 U.S.A. South Dakota Jackson Buffalo Gap National Grassland and Vicinity: ca 2 air mi NE of Cactus Flats in Big Buffalo Creek. -101.86965 43.85625 750 Wooded draw exclosed from grazing, soils are loam and loamy clay. Phenology: flowering. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 9691 Grace M. Kostel 2005 8 9 221 U.S.A. South Dakota Pennington Buffalo Gap National Grassland and Vicinity: ca 2.5 air mi due E of Wall. -102.186667 43.994683 823 On an abandoned roadway in small stream cut, loam soil. Phenology: flowering. RM RM 949623 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 83683 Ronald L. Hartman 2006 8 21 233 U.S.A. New Mexico Taos Carson National Forest and Vicinity: Sangre de Cristo Range: along Rio Grande del Rancho 2 mi S of Forest Service boundary on NM Hwy 518. -105.5812 36.302 2207 Roadside and stream margin. Phenology: flowering. RM RM 371518 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 5592 Hollis Marriott 1983 8 4 216 U.S.A. Wyoming Crook Black Hills, Inyan Kara Creek E of HK Divide, ca 15 air mi W of Sundance. -104.6899 44.3891 1280 Streambanks. Phenology: fruiting. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 6728b Rachel Newton James Pray 2006 8 8 220 U.S.A. Wyoming Teton Wetlands and Adjacent Areas: Snake River, ca 4 air mi NW of Jackson. -110.84069 43.50082 1871 Rocky disturbed uplands Phenology: flowering. RM RM 765617 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 5181 Sarah Nunn 2001 9 9 252 U.S.A. Colorado Larimer Roosevelt National Forest: Front Range: Hewlett Gulch off Colo Hwy 14, 0.5 mi W of Poudre Park, ca 13 air mi NW of Fort Collins. C -105.3185 40.7009 1 1829 2012 North to south running gulch with creek and old homestead with ponderosa pine and Populus; Rhus and Chrysothamnus in dry open areas. Phenology: flowering. RM RM 55301 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 805 O. B. Metcalfe 1903 9 26 269 U.S.A. New Mexico Grant Mangas Springs, 18 mi NW of Silver City. -108.5109 32.8423 1 1454 Phenology: fruiting. RM RM 260144 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 8007 C. L. Porter Marjorie W. Porter 1959 8 6 218 U.S.A. Wyoming Platte Palmer Canyon Road 5-15 mi W of Wheatland. -105.1677 42.0493 3 1463 Common weed of cultivated areas. Phenology: flowering. RM RM 764940 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 1105 Carlos A. Popolizio Donald L. Hazlett 1996 8 28 241 U.S.A. Wyoming Platte Camp Guernsey: Warm Springs Canyon, near Emigrant Trail, ca 1.6 km WSW of Lucindy Rollins Grave. -104.7697 42.2545 1350 Scattered in riparian of level gravelly sand with Juniperus scopulorum, Agrostis stolonifera, Veronica anagallis-aquatica, Populus, and Juncus spp. Phenology: fruiting. RM RM 703845 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 659 Michele Barlow Steve Kettler 1992 9 2 246 U.S.A. Wyoming Sheridan Eastern Plains: Tongue River, 3 mi N of I-90 at Acme exit. -107.1021 44.9032 1 1128 Fraxinus pennsylvanica/Poa pratensis community on gravel and cobble terrace. Phenology: fruiting. RM RM 600630 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 6763 Robert D. Dorn 1995 9 30 273 U.S.A. Wyoming Laramie 1 mi SE of Cheyenne. -104.7338 41.1175 700 1829 Roadside with Helianthus and Oenothera. RM RMRS Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 6 J. J. Thornber 1903 9 20 263 U.S.A. Arizona Pima Tucson; University of Arizona campus; along irrigation ditches. 731 Phenology: flowering & fruiting. RM RM 99332 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 538 Arthur C. McIntosh 1924 7 29 211 U.S.A. South Dakota Pennington Rapid City: Tourist Park. -103.2204 44.0835 1 975 Weed along streams. Phenology: flowering. RM RM 155170 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 7534 George E. Osterhout 1931 8 22 234 U.S.A. South Dakota Meade Near Sturgis. -103.5087 44.4146 3 975 1524 Phenology: flowering. RM RM 312859 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. s.n. George E. Osterhout 1931 8 20 232 U.S.A. South Dakota Pennington E of Rapid City. -103.1519 44.0824 3 914 1067 Phenology: flowering. RM RM 76317 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 2541 S. S. Visher 1911 7 24 205 U.S.A. South Dakota Fall River Phenology: flowering. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 5011 Brian F. Jacobs 2000 9 29 273 U.S.A. New Mexico Sandoval Jemez Mountains: Bandelier National Monument: mouth of Canyon de los Frijoles at White Rock Canyon along the Rio Grande and at Frijoles Spring. Disturbed flats along the river, river edge, and seep. Phenology: flowering & fruiting. RM RM 371615 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 11765 B. E. Nelson 1984 9 12 256 U.S.A. Wyoming Crook Black Hills: Bear Lodge Mountains: along Pine Creek, ca 8 air mi NNW of Aladdin; ca 25 air mi NNE of Sundance. -104.245 44.7447 1 1067 In and around a dried pond. Phenology: flowering & fruiting. RM RM 371614 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 11988 B. E. Nelson 1984 9 16 260 U.S.A. Wyoming Crook Black Hills: along Sand Creek, ca 0.7 air mi S of Beulah, ca 18.8 air mi NE of Sundance. -104.0989 44.5392 1 1067 Grassy stream bank and stream bottom. Phenology: flowering & fruiting. RM RM 371613 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 12100 B. E. Nelson 1984 9 18 262 U.S.A. Wyoming Crook Black Hills: along Inyan Kara Creek, ca 5 air mi E of Keyhole Reservoir, ca 15 air mi W of Sundance. -104.6889 44.39139 1 1250 Creek banks. Phenology: flowering & fruiting. RM RM 324269 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 2088 B. E. Nelson 1978 9 19 262 U.S.A. Wyoming Campbell Powder River Basin: ca 4 air mi NW of Spotted Horse, ca 37 air mi NW of Gillette along Spotted Horse Creek. -105.88944 44.7444 1 1158 Frequent along stream channel with Xanthium and Iva. Phenology: fruiting. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 2560 B. E. Nelson 1978 9 29 272 U.S.A. Wyoming Goshen Southern Powder River Basin/Southeastern Plains: Southeastern Plains: Goshen Hole: ca 0.5 mi N of U.S. Hwy 26, back of UW Experimental Farm along North Platte Ditch, ca 2.3 air mi NW of Torrington, ca 7.3 air mi SE of Lingle. -104.2201 42.0878 700 1250 In sandy soil along irrigation ditch with Euphorbia and Solanum. Common. RM RM 371515 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 5986 Hollis Marriott 1983 8 29 241 U.S.A. Wyoming Crook [location and coordinates withheld] 1067 Sagebrush grassland, reservoir margins. Phenology: fruiting. RM RM 371514 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 8441 Hollis Marriott 1984 8 2 215 U.S.A. Wyoming Weston [location and coordinates withheld] 1432 Aspen stand. Phenology: fruiting. RM RM 371513 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 9311 Hollis Marriott 1984 8 21 234 U.S.A. Wyoming Crook Black Hills: Belle Fourche River Valley ca 6 air mi S of Colony, ca 17 air mi WNW of Belle Fourche, SD. -104.14222 44.7881 1 963 Cottonwood grove near river. Phenology: fruiting. RM RM 324268 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 6172 Keith H. Dueholm 1978 8 25 237 U.S.A. Wyoming Campbell Powder River Basin: ca 1 air mi E of Gary Reservoir. -105.19778 44.9753 2 1097 Large pond and shaded draws and slopes, plains; shaded draw, cattle-trampled area. Phenology: fruiting. RM RM 333337 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 8705 Keith H. Dueholm 1979 8 3 215 U.S.A. Wyoming Johnson Powder River Basin: Boxelder Creek, ca 5 air mi ENE of Lake De Smet. -106.6397 44.5189 1 1341 Meadows along creek, sandy plains, ridges; meadow. Phenology: fruiting. RM RM 333365 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 8949 Keith H. Dueholm 1979 8 11 223 U.S.A. Wyoming Sheridan Powder River Basin: East Twin Creek, ca 2 air mi W of Parkman. -107.3686 44.9589 1 1371 Creek, meadows along creek, cherry thickets, sagebrush plains, hill with roadcut along side, disturbed area along drainage; meadows. Phenology: fruiting. RM RM 599308 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 28505 B. E. Nelson 1993 8 17 229 U.S.A. Wyoming Laramie Southern Powder River Basin/Southeastern Plains: Southeastern Plains: along Bear Creek on Marsh or County Road 245-1, ca 3/4 mi W of (upside down V)X Ranch, ca 25.5 air mi ENE of Iron Mountain (Farthing); ca 35 air mi N of Cheyenne. -104.74519 41.63378 1646 1670 Drier cobblestone gravel bars. Phenology: flowering & fruiting. RM RM 599307 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 28611 B. E. Nelson 1993 8 17 229 U.S.A. Wyoming Goshen Southern Powder River Basin/Southeastern Plains: Southeastern Plains: along Bear Creek ca 1/4 mi above Little Bear Creek on County Road 153, ca 14.3 air mi SE of Chugwater; ca 38.5 air mi SW of Torrington. -104.6186 41.6166 1573 1579 Meadows and low benches along the stream. Phenology: flowering & fruiting. RM RM 599306 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 28682 B. E. Nelson 1993 8 17 229 U.S.A. Wyoming Goshen [location and coordinates withheld] 1506 1512 Roadside and adjacent base of bluffs and thickets. Phenology: flowering & fruiting. RM RM 599305 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 29523 B. E. Nelson 1993 8 31 243 U.S.A. Wyoming Goshen Southern Powder River Basin/Southeastern Plains: Goshen Hole: along North Platte River just below mouth of Laramie River, at east edge of Fort Laramie National Historic Site, ca 1.3 air mi SSW of Fort Laramie; ca 20 air mi WNW of Torrington. -104.5296 42.1965 1286 1292 Cottonwood woodland in the river bottom. Phenology: flowering & fruiting. RM RM 663727 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 33085 B. E. Nelson David Reilly and Jim Cahill 1994 7 20 201 U.S.A. Wyoming Goshen Southern Powder River Basin/Southeastern Plains: Southeastern Plains: Fort Laramie National Historic Site: S of the Laramie River along the north side of the Fort Laramie Canal, ca 2 air mi SW of Fort Laramie (town); ca 21 air mi NW of Torrington. -104.5516 42.1961 1292 1298 Seep area along small drainage. Phenology: flowering. RM RM 663705 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 33503 B. E. Nelson Tim Chumley and Robbin Romberg 1994 8 4 216 U.S.A. Wyoming Goshen Southern Powder River Basin/Southeastern Plains: Southeastern Plains: along Bear Creek ca 3/4 mi W of the mouth of Dater Creek and ca 4 air mi S of Castle Rocks, ca 11 air mi W of La Grange; ca 30 air mi SSW of Torrington. -104.3772 41.6495 1463 Creek banks and adjacent woodlands and meadows. Phenology: flowering. RM RM 663704 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 33822 B. E. Nelson Tim Chumley and Robbin Romberg 1994 8 11 223 U.S.A. Wyoming Platte Southern Powder River Basin/Southeastern Plains: Southeastern Plains: along Chugwater Creek, ca 0.5 air mi N of Bordeaux, ca 9.5 air mi SE of Wheatland. -104.8377 41.9373 1475 Steep creek bank and sand bars. Phenology: flowering. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 6695 Robert D. Dorn 1995 9 12 255 U.S.A. Wyoming Niobrara Lusk. -104.4461 42.7611 1 1524 Dry stream bank with Lythrum and Phalaris. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 6763 Robert D. Dorn 1995 9 30 273 U.S.A. Wyoming Laramie 1 mi SE of Cheyenne. -104.743 41.1248 1829 Roadside with Helianthus and Oenothera. RM RM 663703 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 124 Timothy W. Chumley 1994 8 16 228 U.S.A. Wyoming Laramie Southern Powder River Basin/Southeastern Plains: Southeastern Plains: along Lodgepole Creek on both sides of County Road 148, 5 air mi N of I-80, ca 23.4 air mi ENE of Cheyenne; ca 2 1/2 air mi N of Burns. -104.3691 41.2318 1 1658 Flats above the creek. Phenology: fruiting. RM RM 704267 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 348 Timothy W. Chumley 1994 8 25 237 U.S.A. Wyoming Laramie Southern Powder River Basin/Southeastern Plains: Southeastern Plains: along Horse Creek ca 1 air mi W of I-80 off Nimmo, True or County Road 120, ca 22 air mi N of Cheyenne. -104.9256 41.4558 1 1768 1841 Along creek with heavy willow thickets. Phenology: fruiting. RM RM 371615 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 11765 B. E. Nelson 1984 9 12 256 U.S.A. Wyoming Crook Black Hills: Bear Lodge Mountains: along Pine Creek, ca 8 air mi NNW of Aladdin; ca 25 air mi NNE of Sundance. -104.245 44.7447 1 1067 In and around a dried pond. Phenology: fruiting. RM RM 371614 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 11988 B. E. Nelson 1984 9 16 260 U.S.A. Wyoming Crook Black Hills: along Sand Creek, ca 0.7 air mi S of Beulah, ca 18.8 air mi NE of Sundance. -104.0989 44.5392 1 1067 Grassy stream bank and stream bottom. Phenology: fruiting. RM RM 371613 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 12100 B. E. Nelson 1984 9 18 262 U.S.A. Wyoming Crook Black Hills: along Inyan Kara Creek, ca 5 air mi E of Keyhole Reservoir, ca 15 air mi W of Sundance. -104.6889 44.3914 1 1250 Creek banks. Phenology: fruiting. RM RM 371520 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 5154 Hollis Marriott 1983 7 28 209 U.S.A. Wyoming Crook Black Hills: Redwater Creek, ca 2.2 air mi WNW of Beulah. -104.14028 44.5533 1 1097 Streambank. Phenology: fruiting. RM RM 371519 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 5175 Hollis Marriott 1983 7 28 209 U.S.A. Wyoming Crook Black Hills: Redwater Creek; ca 2.2 air mi WNW of Beulah. -104.1226 44.5557 1 1097 Grassland, roadside. Phenology: fruiting. RM RM 371518 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 5592 Hollis Marriott 1983 8 4 216 U.S.A. Wyoming Crook Black Hills: Inyan Kara Creek E of HK Divide, ca 15 air mi W of Sundance. -104.6889 44.39139 1 1280 Streambanks. Phenology: buds. RM RM 371517 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 5702 Hollis Marriott 1983 8 22 234 U.S.A. Wyoming Crook Black Hills, head of Campstool Draw, ca 3.5 air mi SE of Devils Tower. -104.6655 44.5557 1341 Grassland, disturbed soil near reservoir Phenology: flowering & fruiting. RM RM 371516 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 5869 Hollis Marriott 1983 8 29 241 U.S.A. Wyoming Crook Black Hills: Belle Fourche River near Mona, ca 14.5 air mi NNE of Hulett. -104.4053 44.8436 1 1067 Disturbed grassland near river. Phenology: flowering & fruiting. RM RM 371515 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 5986 Hollis Marriott 1983 8 29 241 U.S.A. Wyoming Crook [location and coordinates withheld] 1067 Sagebrush grassland, reservoir margins. Phenology: fruiting. RM RM 371514 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 8441 Hollis Marriott 1984 8 2 215 U.S.A. Wyoming Weston [location and coordinates withheld] 1432 Aspen stand. Phenology: buds. RM RM 371513 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 9311 Hollis Marriott 1984 8 21 234 U.S.A. Wyoming Crook Black Hills: Belle Fourche River Valley ca 6 air mi S of Colony, ca 17 air mi WNW of Belle Fourche, SD. -104.14222 44.7881 1 960 Cottonwood grove near river. Phenology: fruiting. RM RM 79501 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 9575 Aven Nelson 1910 8 25 237 U.S.A. Wyoming Crook Sundance. Moist banks. Phenology: fruiting. RM RM 314021 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. A-76 Ronald G. Schreibeis 1976 7 31 213 U.S.A. Wyoming Crook -104.0954 44.665 3 1036 Creek bottom. Phenology: fruiting. RM RM 3653 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 563 Aven Nelson 1894 7 21 202 U.S.A. Wyoming Platte Ford J. Ranch. -104.717 42.4754 1 1554 Phenology: flowering. RM RM 544424 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 360 Jan Pollet 1989 8 8 220 U.S.A. Wyoming Platte Laramie River, 12 road mi NE of Wheatland. -104.8411 42.1219 1 1432 Creek banks and grassland. Phenology: flowering & fruiting. RM RM 544421 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 500 Jan Pollet 1989 8 23 235 U.S.A. Wyoming Platte Along Brush Creek, 17 road mi E of Wheatland. -105.1089 41.8346 1 1737 Creek banks, standing water and dry areas. Phenology: flowering & fruiting. RM RM 544422 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 524 Jan Pollet 1989 8 23 235 U.S.A. Wyoming Platte Along Brush Creek, 17 road mi E of Wheatland. -105.1089 41.8346 1 1737 Creek banks, standing water and dry areas. Phenology: flowering & fruiting. RM RM 601027 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 6695 Robert D. Dorn 1995 9 12 255 U.S.A. Wyoming Niobrara Lusk. -104.4477 42.7636 1524 Bank of dry stream with Lythrum salicaria and Phalaris. Phenology: flowering & fruiting. RM RM 600630 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 6763 Robert D. Dorn 1995 9 30 273 U.S.A. Wyoming Laramie 1 mi SE of Cheyenne. 1829 Roadside with Helianthus and Oenothera. Phenology: fruiting. RM RM 644046 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 919 Steve Kettler 1991 9 6 249 U.S.A. Wyoming Platte SE Plains: S bank of Laramie River; ca 1 mi E of Uva; N of landfill. 1350 On sandy rocky soils of stream terrace with mature Populus deltoides with occasional Salix amygdaloides along old side channels and understory of Bromus inermis. Phenology: flowering & fruiting. RM RM 602374 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 14413 Walter Fertig Jane Struttmann 1993 8 17 229 U.S.A. Wyoming Platte SE Plains: ca 1.5 air mi W of I-25 adj. to Brookie Rd, N end of Wheatland. Fallow field dominated by Bromus inermis at edge of grove of Populus deltoides and Elaeagnus. Phenology: flowering & fruiting. RM RM 828356 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 4835 Brian Elliott 1998 8 4 216 U.S.A. Colorado Huerfano [location and coordinates withheld] 1829 Prairie. Phenology: flowering. RM RM 840257 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 7118 Ben Legler 2007 8 6 218 U.S.A. New Mexico Colfax Vermejo Park Ranch: along Dillon Canyon Road (NM Hwy 476) opposite mouth of Gardiner Canyon, on southwest side of golf course on southwest side of Raton. -104.4720278 36.8865 7 2019 Dry weedy road shoulders, with Helianthus annuus, Ericameria nauseosa, grasses. Occasional on road edge. Phenology: flowering. RM RM 840256 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 7655 Ben Legler 2007 8 13 225 U.S.A. New Mexico Colfax Vermejo Park Ranch: along main road leading through Vermejo Park 0.1 mi S of Casa Grande. -104.9791111 36.88633333 4 2288 Weedy roadside dominated by Ambrosia, Bromus, other grasses. Flowers yellow; stems to 1.5 meters tall; scattered along roadside. Phenology: flowering. RM RM 828355 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 5656 Brian Elliott 1998 8 19 231 U.S.A. Colorado Fremont [location and coordinates withheld] 1722 Roadside and prairie. Phenology: flowering. RM RM 840255 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 10533 Ben Legler 2008 8 10 223 U.S.A. New Mexico Colfax Vermejo Park Ranch: on south side of Vermejo River 2.2 air mi due W of I-25 and 3.5 air mi SW of Maxwell. -104.601631 36.509312 1799 Moist, silty river bottoms with Tamarix chinensis, Helianthus annuus, Kochia scoparia, and Mirabilis nyctaginea. Stems to 2 meters tall; uncommon. Specimen GPS: 36.513447, -104.601547. Phenology: flowering. RM RM 828354 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 62412 Ronald L. Hartman 1998 7 22 203 U.S.A. Colorado Las Animas Wet Mountains, Wet Mountain Valley, Sangre de Cristo Range, and Vicinity: Picketwire Valley, ca 1 mi E of Cordova Plaza. -104.802 37.1272 2042 Roadside. Phenology: flowering. RM RM 828353 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 63170 Ronald L. Hartman Craig Freeman 1998 8 13 225 U.S.A. Colorado Pueblo Wet Mountains, Wet Mountain Valley, Sangre de Cristo Range, and Vicinity: ca 1.5 road mi E of Rye. -104.9076 37.9184 1951 Roadside and road cut. Phenology: flowering. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 457 W. C. Knight U.S.A. Nebraska Gage Phenology: flowering. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 458 W. C. Knight U.S.A. Nebraska Gage Phenology: flowering. RM RM 226825 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. s.n. Harry Hapeman 1941 8 23 235 U.S.A. Nebraska Kearney Minden. Phenology: flowering. RM RM 243019 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. s.n. Harry Hapeman 1939 8 31 243 U.S.A. Nebraska Kearney Minden. Phenology: flowering. RM RM 154291 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 215 O. A. Stevens 1936 8 29 242 U.S.A. North Dakota Cass Fargo: edge of river. In mud. Phenology: flowering. RM RM 44703 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. s.n. L. R. Waldron 1901 8 14 226 U.S.A. North Dakota Cass Vicinity of Fargo. 275 Black alluvial loam soil. Phenology: flowering. RM RM 154290 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 214 O. A. Stevens 1936 8 29 242 U.S.A. North Dakota Cass Fargo: edge of river. In mud. Phenology: flowering. RM RM 92765 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. s.n. J. F. Brenckle 1911 8 213 U.S.A. North Dakota Kulm. Waste places. Phenology: flowering. RM RM 24648 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. s.n. Lee 1891 7 17 198 U.S.A. North Dakota Lisbon. Phenology: flowering. RM RM 39141 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. s.n. J. Lunell 1902 7 21 202 U.S.A. North Dakota Benson Leeds. Waste places. Phenology: flowering. RM RM 39142 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. s.n. J. Lunell 1902 8 22 234 U.S.A. North Dakota Benson Leeds. Waste places. Phenology: flowering. RM RM 355070 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 900 Ellen Collins 1983 8 9 221 U.S.A. Montana Big Horn Slopes above Fort Smith near substation. -107.9384 45.3106 1 1067 Tall grass prairie. Phenology: flowering. RM RM 469671 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 490 James C. Whitham 1921 8 5 217 U.S.A. Montana Powder River Custer National Forest: Otter Creek, Howes' Ranch. 1036 Moist creek bank. Scattered. Phenology: flowering. RM RM 829855 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 10509 Brian Elliott Elizabeth Mark 1999 8 7 219 U.S.A. Colorado Pueblo [location and coordinates withheld] 1783 Vacant city lot, highly disturbed. Phenology: flowering. RM RM 829857 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 10541 Brian Elliott Elizabeth Mark 1999 8 7 219 U.S.A. Colorado Las Animas Wet Mountains, Wet Mountain Valley, Sangre de Cristo Range, and Vicinity: along Purgatorie River, north end of Trinidad. -104.4936 37.1854 1829 Riparian, ditch, wetlands. Phenology: flowering. RM RM 829856 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 10765 Brian Elliott Elizabeth Mark 1999 8 9 221 U.S.A. Colorado Las Animas Wet Mountains, Wet Mountain Valley, Sangre de Cristo Range, and Vicinity: Bosque de Oso Wildlfe Area, mine reclamation site, ca 0.5 mi S of Zamora. -105.9167 37.1444 2195 Mixed grasses and forbs; highly disturbed. Phenology: flowering. RM RMRS 457 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. s. n. W. C. Knight U.S.A. Nebraska Gage Phenology: flowering & fruiting. RM RMRS 458 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. s. n. W. C. Knight U.S.A. Nebraska Gage Phenology: flowering & fruiting. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 7850 Joseph L. M. Charboneau Damien Austin 2011 7 19 200 U.S.A. Montana Phillips American Prairie Reserve: Parrot Coulee at confluence with Beaver Creek, ca 1.5 air mi SW of Veseth Reservoir, ca 16 air mi E of Zortman; ca 36 air mi SSW of Malta. -108.2004 47.8969 829 835 Silty flats above creek bed. Phenology: buds. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 8941 Joseph L. M. Charboneau 2011 8 4 216 U.S.A. Montana Valley Willow Creek near its confluence with Eagles Nest Coulee and ridge to the W, ca 7.5 air mi WNW of Newberry Flat Reservoir, ca 15 air mi NNE of Hinsdale; ca 32 air mi NW of Glasgow. -106.9702 48.5868 682 701 Sandy creek bottoms and riparian groves of cottonwood and willow. Phenology: flowering & fruiting. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 9286 Joseph L. M. Charboneau 2011 8 9 221 U.S.A. Montana Phillips Beaver Creek and DHS Creek near their confluence, ca 3.5 air mi E of Black Cow Reservoir, ca 48 air mi ENE of Zortman; ca 24 air mi SE of Malta. -107.5552 48.0886 692 698 Steep silty stream banks. Phenology: flowering. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 9333 Joseph L. M. Charboneau 2011 8 11 223 U.S.A. Montana Phillips McNeil Slough Waterfowl Production Area: Milk River, ca 1 air mi N of Hewitt Lake, ca 13.5 air mi NW of Saco; ca 20 air mi NE of Malta. -107.5889 48.5557 673 682 Riparian bottoms with closed canopy cottonwood groves to scattered chokecherry, green ash, and boxelder with silver sagebrush. Phenology: flowering & fruiting. RM RM Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 9577 Joseph L. M. Charboneau 2011 8 13 225 U.S.A. Montana Phillips American Prairie Reserve: Telegraph Creek, ca 4.5 air mi NE of Indian Lake, ca 38 air mi ESE of Zortman; ca 41.5 air mi S of Malta. -107.7694 47.7749 716 719 Riparian cottonwood grove with snowberry understory. Phenology: flowering & fruiting. RM RM 958319 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 12180 Robert D. Dorn 2018 8 1 213 U.S.A. South Dakota Fall River Chautauqua Park along Hot Brook at Hot Springs. -103.488333 43.443333 1097 Disturbed area with Ambrosia artemisiifolia and Bromus. Phenology: flowering & fruiting. RM RM 304840 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 957 L. M. Mayer I. J. Mayer 1977 8 23 235 U.S.A. Wyoming Sheridan Whitney Coal Site: Acme Quadrangle. -106.9185 44.9598 1079 1155 Dry soil in intermittant waterway; riparian woodlands. Acme Quadrangle. Phenology: fruiting. RM RM 68891 Ambrosia trifida physical specimen Asteraceae Ambrosia trifida L. 329 Vie Willits 1909 7 19 200 U.S.A. Wyoming Sheridan Willets Spring. Edges of thickets bordering swamps. Phenology: fruiting. 3600 3,1,0 true