Polygonum achoreum (1997)
POLYGONACEAE
Polygonum achoreum S. F. Blake
U.S.A., Wyoming, Park County: Northern Absaroka Area: Ishawooa Creek Pack Trail, Ishawooa Hills.
Barren to grassy slopes and some wet spots. Phenology: flowering.
with Jim Fowler
Accession: USFS 653693, Barcode: RM0059272

Polygonum achoreum (1997)
POLYGONACEAE
Polygonum achoreum S. F. Blake
U.S.A., Wyoming, Park County: Northern Absaroka Area: road S of the North Fork Shoshone River, ca 0.5 air mi E of Wapiti.
Elev. 5600 ft.
Roadside and slope to river. Phenology: flowering & fruiting.
Accession: USFS 653694, Barcode: RM0229158

Polygonum achoreum (1997)
POLYGONACEAE
Polygonum achoreum S. F. Blake
U.S.A., Wyoming, Park County: Northern Absaroka Area: Buffalo Bill Reservoir, ca 10 air mi ESE of Wapiti.
Elev. 5500 ft.
Area of water fluxuation and roadside. Phenology: flowering & fruiting.
Accession: USFS 653695, Barcode: RM0229159

U.S.A., Wyoming, Park County: Northern Absaroka Area: South Fork Road, ca 0.5 air mi SW of Hunter Creek Road turnoff.
Elev. 6500 ft.
Along stream through burned sagebrush. Phenology: flowering.
Accession: RM 653696, Barcode: RM0059271

U.S.A., Montana, Madison County: Madison Range: Beaverhead National Forest: along Papoose Creek in the foothills, ca 1 mi E of U.S. Hwy 287, 23 mi S of Cameron.
Disturbed sagebrush-grassland with Phleum pratense, Achillea millefolium, Elymus spicatus, and Helianthella uniflora. Phenology: flowering & fruiting.
Accession: RM 610614

U.S.A., Montana, Sweet Grass County: [location and coordinates withheld]
Disturbed, weedy riparian area and field with Bromus tectorum, Medicago lupulina, and Poa pratensis. Phenology: flowering & fruiting.
Accession: RM 783827

U.S.A., Montana, Park County: Paradise Valley: Grey Owl/Chicory Public Fishing accesses along the west side of the Yellowstone River, 19 mi S of Livingston.
T5S R8E S14
Disturbed riparian community adjacent to corrals with Bromus tectorum, Melilotus officinalis, Centaurea maculosa, and Populus balsamifera. Phenology: flowering & fruiting.
Accession: RM 819213, Barcode: RM0021299

U.S.A., Montana, Carbon County: Along Bear Creek Road, ca 3/4 mi E of Belfry.
T8S R22E S14
Dirt road and adjacent corn and sugar beet fields with Kochia scoparia, Portulaca oleracea, and Amaranthus albus. Phenology: flowering & fruiting.
Accession: RM 819994, Barcode: RM0014512

U.S.A., Wyoming, Teton County: Gros Ventre Area: upper Gros Ventre River Road, between Big Cow Creek and Lafferty Creek.
Roadside through sagebrush and lodgepole pine. Phenology: flowering.

U.S.A., Wyoming, Sublette County: Gros Ventre Area: Jack Creek Basin.
Cut hillside with some aspen. Phenology: fruiting.

U.S.A., Wyoming, Teton County: Gros Ventre Area: ridge just N of Lower Horse Creek, ca 1.5 air mi NNE of Hoback Junction.
Roadside, meadow, and cliffs. Phenology: fruiting.

U.S.A., Wyoming, Teton County: Gros Ventre Area: Alkali Creek from Gros Ventre River Road to river and down stream ca 0.5 air mi.
Stream and river sides. Phenology: flowering & fruiting.

U.S.A., Wyoming, Teton County: Gros Ventre Area: Goose Lake; ca 0.5 air mi W of Lake Creek.
Lake nearly dried out, on margins and roadside. Phenology: fruiting.

U.S.A., Wyoming, Teton County: Gros Ventre Area: Soda Lake and outlet stream.
Wet margins and adjacent coniferous forests. Phenology: fruiting.

U.S.A., Wyoming, Teton County: Gros Ventre Area: Crystal Creek Campground to East Miner Creek, on both sides of tall hill.
Coniferous forest. Phenology: fruiting.

U.S.A., Wyoming, Sublette County: Gros Ventre Area: ca 7 air mi E of Bondurant.
Meadow and willow thickets along stream. Phenology: flowering & fruiting.
Accession: 650915, Barcode: RM0229157

U.S.A., Wyoming, Teton County: Gros Ventre Area: Flat Creek, 2-4 air mi NW of Flat Creek Ranch.
T41N R115W S1
Open and wooded areas along stream or road. Phenology: flowering & fruiting.
Accession: (unaccessioned)

U.S.A., Wyoming, Teton County: Mount Leidy Highland Area: ca 6 air mi SSW of Moran.
Grassy area. Phenology: flowering & fruiting.
Accession: 650920, Barcode: RM0229148

U.S.A., Wyoming, Teton County: Mount Leidy Highland Area: Upper Slide Lake.
Rocky slopes. Phenology: flowering & fruiting.
with Stuart Markow
Accession: 650919, Barcode: RM0229149

U.S.A., Wyoming, Teton County: Mount Leidy Highland Area: 2-4.5 air mi E of Black Rock Ranger Station.
Mountain slope and roadside. Phenology: flowering & fruiting.

U.S.A., Wyoming, Teton County: Mount Leidy Highland Area: highland N of Lower Gros Ventre Drainage and S of Ditch and Slate Creeks: 4 air mi NE of Crystal Creek Campground.
Along creek. Phenology: flowering & fruiting.
Accession: (unaccessioned)

U.S.A., Colorado, Eagle County: Central Colorado: Castle Peak Area, West Slope Continental Divide: ca 0.7-2 air mi S of State Bridge off Colo Hwy 131.
Sagebrush slopes and shaded ravines. Phenology: flowering & fruiting.
Accession: (unaccessioned)

U.S.A., Wyoming, Teton County: Mount Leidy Highland Area: highland N of lower Gros Ventre drainage and S of Slate Creek, ca 4 air mi NE of Crystal Creek Campground.
Along creek. Phenology: flowering & fruiting.

U.S.A., Wyoming, Teton County: Gros Ventre Area: Flat Creek, 2-4 air mi NW of Flat Creek Ranch.
Open and wooded areas along stream or road. Phenology: flowering & fruiting.

U.S.A., Colorado, Larimer County: Roosevelt National Forest: Front Range: Forest Road 137 off Crown Point Road (Forest Road 139) at intersection with South Fork Bennett Creek, ca 24 air mi W of Fort Collins.
Montane creek with Alnus and Colorado blue spruce, and surrounding dry slopes with ponderosa pine and Ribes. Phenology: flowering & fruiting.
Accession: RM 772211

U.S.A., Wyoming, Laramie County: Ca 6 mi W of Midway; ca 1 mi N of U.S. Hwy 85.
41.3789° N, 104.5745° W; NAD 83, uncertainty 1 mi., Nat. Geog. TOPO!
Phenology: flowering & fruiting.
with J. Von Loh

U.S.A., Wyoming, Park County: Absaroka Mountains: North Fork Shoshone River Drainage: along north side of U.S. Hwy 14, 16, and 20, ca 1/4 mi E of Goff Creek.
In Highway Department dump and maintenance area. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Absaroka Mountains: North Fork Shoshone River Drainage: Shoshone Lodge, ca 48 mi W of Cody.
Around buildings. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Absaroka Mountains: North Fork Shoshone River Drainage: Circle H Ranch on Big Creek, ca 24 mi W of Cody.
Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: North Fork Shoshone River Drainage: Absaroka Mountains: along Elk Fork Creek trail, ca 5-6 mi S of U.S. Hwy 14, 16, & 20.
Mostly open habitats with Artemisia spp. Phenology: flowering.

U.S.A., Wyoming, Park County: Southeastern Absarokas: Stratford Ranch, along east side of South Fork Shoshone River, ca 40 mi SW of Cody.
In disturbed areas on and along roads. Phenology: flowering.

U.S.A., Wyoming, Teton County: Jackson Hole Wildlife Park: Elk pasture.
43.5291° N, 110.7393° W; NAD 83, uncertainty 2 mi., Digital Map
Roadside. *should be ca 6,300 ft* Phenology: flowering & fruiting.
with Mildred S. Reed

U.S.A., Wyoming, Park County:
Disturbed area with no associates. Phenology: flowering & fruiting.

U.S.A., Wyoming, Platte County: Grayrocks Reservoir.
Disturbed area with Kochia, Descurainia. Phenology: flowering & fruiting.

U.S.A., Wyoming, Hot Springs County: Owl Creek Mountains: Anchor Reservoir, ca 31 air mi W of Thermopolis.
Sandy gravel along roadside with P. aviculare, Bromus tectorum, Hordeum x caespitosum. Phenology: flowering & fruiting.

U.S.A., Wyoming, Laramie County: Laramie Range: Curt Gowdy State Park: ridge on west side of Middle Crow Creek at north end of Crystal Lake Reservoir; ca 22.5 air mi SE of Laramie.
41.161° N, 105.2068° W; NAD 83, uncertainty 0.5 mi., Nat. Geog. TOPO!
Disturbed soil on south-facing slope. Phenology: flowering & fruiting.
with Jane Struttmann

U.S.A., Wyoming, Platte County: Southeastern Plains: ca 1.5 air mi W of I-25, adjacent to Brookie Road, north end of Wheatland.
Dry, sandy-gravelly roadside dominated by Echinochloa, Setaria. Phenology: flowering & fruiting.
with Jane Struttmann

U.S.A., Wyoming, Sheridan County: Big Horn Mountains: rim of Boyd Ridge, ca 0.3 mi S of Mann Creek; ca 0.9 mi N of Leaky Mountain.
Spring at head of steep side canyon; soil disturbed by cattle use of adj. water tank; wet meadow community with Agrostis, Juncus, and Phleum pratense.
Accession: RM (unaccessioned)

U.S.A., Wyoming, Sheridan County: Big Horn Range: rim of Boyd Ridge, ca 0.3 mi S of Mann Creek; ca 0.9 mi N of Leaky Mountain.
Spring at head of steep side canyon; soil disturbed by cattle use of adjacent water tank; wet meadow community of Agrostis, Juncus, Phleum pratense. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Absaroka Mountains: ca 18 mi WSW of Meeteetse, along Timber Creek in the vicinity of the Timber Creek Ranger Station.
Along the creek in wet areas and adjacent banks; disturbed areas. Phenology: flowering & fruiting.
Robert S. Kirkpatrick, 2023. 8/13/1983.

U.S.A., South Dakota, Meade County: Sturgis.
Frequent in dry soil along road. Phenology: flowering.
Arthur C. McIntosh, 710. 7/8/1925.

U.S.A., South Dakota, Fall River County: N of Hot Springs.
43.4304° N, 103.4765° W; NAD 83, uncertainty 2 mi., Nat. Geog. TOPO!
Phenology: flowering.
George E. Osterhout, 7910. 7/8/1932.

U.S.A., South Dakota, Custer County: Jewel Cave National Monument: sewer lagoon.
On distrubed soil on bank. Phenology: flowering.

U.S.A., South Dakota, Custer County: Jewel Cave National Monument: U.S. Highway 16 between Hell Canyon and road to Stockpile and old water reservoir.
T4S R2E S2 NE1/4
Roadside. Phenology: flowering.

U.S.A., Colorado, Boulder County: Grounds of The National Bureau of Standards at Boulder, CO.
With P. rurivagum. Phenology: flowering.

U.S.A., Wyoming, Natrona County: Laramie Range: along Smith Creek below Otter Creek at the east end of Muddy Mountain on Smith Creek or County Road 607, ca 16 air mi SE of Casper.
Roadside. Phenology: fruiting.

U.S.A., Wyoming, Albany County: Laramie Range: along Corduroy Creek below Old Fort Fetterman or County Road 61, ca 17 air mi W of Esterbrook; ca 77.5 air mi N of Laramie.
Roadside. Phenology: fruiting.

U.S.A., Idaho, Fremont County: Targhee National Forest: West Slope Teton Range: Cart Hollow, ca 3 air mi NE of Lamont.
T8N R45E S28; also S33
Lodgepole pine forests with scattered meadows and wet areas.
with Rafael Molina

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

U.S.A., Wyoming, Sublette County: Wyoming/Salt River Ranges: Salt River Range: South end of Deadline Ridge, ca 3 air mi NW of Viola.
Rocky slopes and ridges. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Northern Absarokas: along Deadman Creek above the Reef, ca 1 mi N of Russell Peak, ca 32 air mi NW of Cody.
Road. Phenology: fruiting.

U.S.A., Wyoming, Teton County: West Slope Wind River Range: Fish Creek/Moccasin Basin area, along South Fork Fish Creek between Buck and Devils Basin Creeks, ca 34 air mi ENE of Jackson.
Roadside and disturbed areas in sagebrush-grassland. Phenology: flowering.

U.S.A., Wyoming, Teton County: West Slope Wind River Range: along Purdy Creek NE of South Fork Fish Creek, ca 31.5-32 air mi ENE of Jackson.
Along old road. Phenology: flowering & fruiting.

U.S.A., Wyoming, Teton County: West Slope Wind River Range: Fish Creek/Moccasin Basin area, along Fish Creek just below confluence of North and South Forks, ca 28.5-29.5 air mi ENE of Jackson.
On old road. Phenology: flowering & fruiting.

U.S.A., Wyoming, Johnson County: Big Horn Mountains: along North Clear Creek, just W of Hunter Ranger Station, ca 11 air mi WSW of Buffalo.
Roadside. Phenology: flowering & fruiting.
with B. E. Nelson

U.S.A., Wyoming, Weston County: [location and coordinates withheld]
Sparse grassland on rocky soil with slabby outcrops (Minnekahta limestone), on dirt road. Phenology: flowering & fruiting.

U.S.A., Wyoming, Johnson County: Big Horn Mountains: Hunter Mesa, ca 1 air mi NW of Hunter Ranger Station.
Meadows on ridge, lodgepole pine forest on north face, granite outcrops, Forest Service roads; along road. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Northern Absarokas: Little Bald Ridge and Little Sunlight Creek, 2-3 air mi W of Sunlight Ranger Station.
Limestone talus slopes, ridges, and caprock, stream bottoms with willow and cottonwood, and disturbed roadsides; along stream with willow and cottonwood and disturbed areas. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Northern Absarokas: Painter Gulch en route to Windy Mountain, 1.5 air mi S to 1 air mi W of summit, 3-5 air mi NNW of Sunlight Ranger Station.
Roadside, streambank, and coniferous forest understory. Phenology: flowering & fruiting.
with B. E. Nelson

U.S.A., Wyoming, Teton County: West Slope Wind River Range: Cottonwood Creek from outfitter's camp to Sohare Creek.
Meadows and scattered lodgepole pine and Engelmann spruce. Phenology: flowering & fruiting.

U.S.A., Wyoming, Teton County: West Slope Wind River Range: South Fork Fish Creek between Purdy and Hackamore Creeks.
Meadows, gravel bars, and adjacent lodgepole pine forests. Phenology: flowering & fruiting.

U.S.A., Wyoming, Sublette County: West Slope Wind River Range: Highlands ca 1 mi NE of Scab Creek Campground, ca 15 air mi E of Pinedale.
Shady lodgepole pine forest with thick needle duff. Phenology: flowering & fruiting.

U.S.A., Wyoming, Teton County: West Slope Wind River Range: adjacent to Forest Road 30410 and Cottonwood Creek, ca 26 air mi E of Jackson.
Roadside. Phenology: flowering.

U.S.A., Wyoming, Sublette County: West Slope Wind River Range: Boulder Creek Canyon, due E of Boulder Lake, ca 14 air mi E of Pinedale.
Shady, moist bank of Boulder Creek in birch/willow/Douglas fir woods.
Accession: RM (unaccessioned)

U.S.A., Wyoming, Laramie County: Southern Powder River Basin/Southeastern Plains: Southeastern Plains: between County Road 215 and Union Pacific Railroad tracks, ca 2.3 air mi W of Hillsdale; ca 15.3 air mi NE of Cheyenne.
Roadside. Phenology: flowering & fruiting.

U.S.A., Wyoming, Platte County: Grayrocks Reservoir.
Disturbed area with Kochia and Descurainia.
Accession: RM (unaccessioned)

U.S.A., Wyoming, Laramie County: [location and coordinates withheld]
Sandy slopes. Phenology: flowering & fruiting.

U.S.A., Wyoming, Sublette County: Green River Basin: Horse Creek, ca 4.5 air mi SE of Merna.
Sandstone bluff above creek, sagebrush, aspen groves, and scattered limber pine. Phenology: flowering & fruiting.

U.S.A., Wyoming, Weston County: [location and coordinates withheld]
Sparse grassland on rocky soil with slabby outcrops (Minnekahta limestone), on dirt road. Phenology: flowering & fruiting.
Hollis Marriott, -. 8/10/1984.

U.S.A., Wyoming, Crook County: [location and coordinates withheld]
Grassland and disturbed soil around lake. Phenology: flowering.

U.S.A., Wyoming, Crook County: Black Hills: Bear Lodge Mountains: Taylor Divide, ca 8.5 air mi S of Alva.
Grassland, roadside. Phenology: flowering.

U.S.A., Wyoming, Crook County: Black Hills, Redwater Creek, ca 2.2 air mi WNW of Beulah.
Grassland, roadside. Phenology: flowering.

U.S.A., Wyoming, Crook County: Black Hills: Goldie Divide near junction of Goldie and New Haven roads, ca 5 air mi NW of Hulett.
Ponderosa pine-bur oak forest, roadside. Phenology: flowering & fruiting.

U.S.A., Wyoming, Crook County: Black Hills, Inyan Kara Creek E of HK Divide, ca 15 air mi W of Sundance.
Grassland, roadside. Phenology: flowering & fruiting.

U.S.A., Wyoming, Crook County: Black Hills, Devils Tower trading post and post office, ca .8 air mi E of Devils Tower.
Elev. 3900
Disturbed soil around buildings and in garden. 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, on dirt road. Phenology: flowering & fruiting.

U.S.A., Wyoming, Crook County: Black Hills, Bear Lodge Mountains, head of Rocky Ford Creek, Government Valley Road, ca 3 air mi NNE of Sundance.
Grassland, roadside. Phenology: flowering & fruiting.

U.S.A., Wyoming, Weston County: Black Hills: Thomson Canyon, ca 9.5 air mi NE of Newcastle.
Roadside in canyon bottom. Phenology: flowering & fruiting.
with Elizabeth Gross

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.
Along dirt road in grassland. Phenology: flowering & fruiting.

U.S.A., Wyoming, Weston County: Black Hills: Wet Parmlee Canyon near state line, ca 4.5 air mi SE of Four Corners.
Creek bottom in spruce-Ponerosa pine forest, disturbed soil along dirt road. Phenology: fruiting.
with Dennis Horning

U.S.A., Wyoming, Crook County: Black Hills: Grand Canyon near state line, ca 23 air mi SE of Sundance.
Meadow (grazed) edged with Ponderosa pine and aspen, disturbed soil near stock tank. Phenology: fruiting.

U.S.A., Wyoming, Crook County: Black Hills: Inyan Kara Mountain (east half); ca 13.5 air mi S of Sundance.
Grassland on southeast-facing slope, on old dirt road. Phenology: flowering & fruiting.

U.S.A., Wyoming, Crook County: Black Hills: ca 2 air mi NE of Aladdin.
Prairie, sandstone outcrops, and dry drainage; roadside. Phenology: flowering & fruiting.

U.S.A., Wyoming, Crook County: Black Hills: 9.5 air mi E of Sundance.
Ponderosa pine slopes, stream bottom, and meadow; roadside. Phenology: flowering & fruiting.

U.S.A., Wyoming, Crook County: Black Hills: Sand Creek, 11-12 air mi ESE of Sundance.
Canyon bottom and lower slopes; disturbed trail. Phenology: flowering & fruiting.

U.S.A., Wyoming, Crook County: Black Hills: Buckley Canyon, ca 10.5 air mi SE of Sundance.
Wooded ridge (Pinus ponderosa) with sandstone outcrops, sandy slopes, and meadow; roadside. Phenology: flowering & fruiting.

U.S.A., Wyoming, Crook County: Powder River Basin: just E of U.S. Hwy 14 on Old Sundance Road, 4 air mi NE of Moorcroft.
Rolling sagebrush hills and moist drainages; roadside. Phenology: flowering & fruiting.

U.S.A., Wyoming, Crook County: Black Hills: ca 7.5 air mi SE of Sundance.
Pinus ponderosa covered ridge and open sandy slopes; roadside. Phenology: flowering & fruiting.

U.S.A., Montana, Carbon County: Pryor Mountains: Custer National Forest: between Tibbs Hollow and Mill Hollow just S of Tie Flat or Forest Road 2104 on the lower slope of Big Pryor Mountain, ca 25 air mi ESE of Bridger.
45.157° N, 108.4525° W; uncertainty 0.5 mi., GPS reading
Disturbed area on red clay. Phenology: flowering & fruiting.
Annotations:
1. Polygonum achoreum S. F. Blake
Annotated by B. E. Nelson.
Accession: USFS 884286, Barcode: USFS0051928

U.S.A., Montana, Carbon County: Pryor Mountains: Custer National Forest: ca 0.5 air mi E of Stevens Draw, just N of Tie Flat, ca 24 air mi ESE of Bridger.
45.1819° N, 108.4536° W; uncertainty 0.25 mi., GPS reading
In sandy old road through young lodgepole pine forest. Phenology: flowering & fruiting.
Annotations:
1. Polygonum achoreum S. F. Blake
Annotated by B. E. Nelson.
Accession: USFS 884285, Barcode: USFS0051927

U.S.A., Montana, Gallatin County: Gallatin Range: Gallatin National Forest: along Porcupine Creek from trailhead to 3/4 air mi ESE, ca 3-3.5 air mi SSE of intersection of U.S. Hwy 191 and Mont Hwy 64 (Big Sky), ca 33 air mi SSW of Bozeman.
Parking lot at trailhead and adjacent areas. Phenology: flowering & fruiting.
Accession: USFS 870194, Barcode: USFS0065367

U.S.A., Montana, Stillwater County: Beartooth Mountains: ca 4 air mi SSW of Limestone.
Open grassy slopes. Phenology: flowering.

U.S.A., Montana, Carbon County: 0.5 air mi S of Columbus on Mont Hwy 78 at Itch-kep-pe Park along the Yellowstone River.
Along river and throughout park. Phenology: flowering & fruiting.

U.S.A., Montana, Judith Basin County: Lewis and Clark National Forest: Little Belt Mountains: Forest Road 262 along Lone Tree Creek, ca 11.5 air mi S of Geyser.
47.114° N, 110.5345° W; NAD 83, uncertainty 0.25 mi., GPS reading
Open meadow, riparian along dry creek; Picea engelmannii/Pinus contorta; east aspect, 5-30% slope; limestone bedrock. Phenology: fruiting.
Annotations:
1. Polygonum achoreum S. F. Blake.

U.S.A., Montana, Meagher County: Lake Sutherlin on North Fork Smith River along U.S. Hwy 12.
46.6213° N, 110.7351° W; NAD 83, uncertainty 0.25 mi., GPS reading
Receding margin of reservoir and above. Phenology: fruiting.
1. Polygonum achoreum S. F. Blake
Annotated by Rick McNeill.

U.S.A., Montana, Meagher County: Bair Reservoir on North Fork Musselshell River along U.S. Hwy 12.
46.5836° N, 110.5698° W; NAD 83, uncertainty 0.25 mi., GPS reading
Receding shoreland and slope above. Phenology: fruiting.
Annotated by Rick McNeill.

U.S.A., Montana, Carter County: Custer National Forest: Long Pines: at the mouth of Spring Canyon and just below at the northwest base of Rustler Ridge, ca 20.5 air mi SE of Ekalaka.
Roadside. Phenology: fruiting.

U.S.A., Montana, Carter County: Custer National Forest: Long Pines: just W of Forest Road 3117, in and around unnamed pond in Spring Canyon, ca 16 air mi NW of Camp Crook, SD.
On margin of unnamed still-water pond. Phenology: fruiting.
with G. Gust

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: fruiting.
with G. Gust

U.S.A., Montana, Carter County: Custer National Forest: Ekalaka Hills: in and E of Stagville Draw on Forest Road 3813 at Stagville Spring, SE past Forest Road 3813B to east boundary of Forest, ca 5.5 air mi SSE of Ekalaka.
Grass and ponderosa pine-dominated woodland. Phenology: fruiting.
with G. Gust

U.S.A., Montana, Phillips County: Along Harb Road at an unnamed coulee, ca 23 air mi SSW of Saco; ca 25 air mi ESE of Malta.
In and along an old road in sandy clay. Phenology: fruiting.

U.S.A., Montana, Phillips County: Along Pickhandle Coulee, ca 24 air mi SSE of Saco; ca 26 air mi ESE of Malta.
In and along an old road in sandy clay. Phenology: flowering & fruiting.

U.S.A., Montana, Phillips County: Along North Whitewater Road ca 5 air mi N of Whitewater; ca 35.5 air mi NNE of Malta.
Gravelly roadside. Phenology: flowering & fruiting.

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.
Disturbed area at the edge of the flats above the river. Phenology: fruiting.

U.S.A., Montana, Valley County: Hinsdale Wildlife Management Area: along the Milk River above and below the Bear Creek confluence, ca 1.5-2 air mi N of Hinsdale.
In parking area and two-track. Phenology: fruiting.

U.S.A., North Dakota, Barnes County: Valley City.
Phenology: flowering & fruiting.

Polygonum achoreum ()
U.S.A., North Dakota, no county County:
Collected during or before 1901. Phenology: flowering & fruiting.

U.S.A., North Dakota, Cass County: Fargo.
Roadside. Plants erect or spreading. Phenology: fruiting.

U.S.A., South Dakota, Spink County: Northville.
Roadsides in town. Phenology: buds.

U.S.A., South Dakota, Brookings County: Brookings.
Door yards. Phenology: buds.
Frank E. Hepner, s.n.. 6/6/1898.

U.S.A., South Dakota, Spink County: Mellette.
Streets. Phenology: flowering & fruiting.

U.S.A., South Dakota, Spink County: Mellette.
Streets. Phenology: buds.

U.S.A., South Dakota, Spink County: Mellette.
Sides of streets. Phenology: buds.

Streets. Phenology: buds.

Polygonum achoreum ()
U.S.A., Nebraska, Gage County:
Phenology: vegetative only.
W. C. Knight, s.n.. //.

U.S.A., Montana, Phillips County: American Prairie Reserve: Box Elder Creek and hills above, ca 4 air mi E of Indian Lake, ca 38.5 air mi ESE of Zortman; ca 44 air mi SSE of Malta.
Roadside on clay. Phenology: flowering & fruiting.
Joseph L. M. Charboneau, 5739. 6/24/2011.
with Mark Majerus, Michael Dolan, Noorjahan Parwana, Katie Butts, and Mary Frieze

U.S.A., Montana, Phillips County: N of Cottonwood Creek, ca 9.5 air mi WNW of Fanny Hill, ca 27 air mi WSW of Whitewater; ca 27 air mi NNW of Malta.
Roadside. Phenology: flowering & fruiting.
Joseph L. M. Charboneau, 6782. 7/5/2011.

U.S.A., Montana, Blaine County: Black Coulee National Wildlife Refuge: Black Coulee, ca 10.5 air mi S of Turner, ca 21 air mi NE of Harlem; ca 34.5 air mi NW of Malta.
Joseph L. M. Charboneau, 8326. 7/30/2011.

U.S.A., Montana, Carter County: Custer National Forest: Long Pines: just W of Forest Road 3117, in and around unnamed pond in Spring Canyon, ca 16 air mi NW of Camp Crook, SD.
On margin of unnamed still-water pond. Phenology: fruiting.
Accession: (unaccessioned), Barcode: USFS0050747

U.S.A, Idaho, Custer County: Targhee National Forest: Lemhi Range: divide between North Fork Eightmile Canyon and South Fork Pass Creek, 31.7 air mi ENE of Mackay.
T9N R29E S33
25-75 plants estimated in xeric coarse textured soil within roadside vegetation, 2 degree slope, N aspect, limestone geology. 25-75 plants estimated. Phenology: flowering.

U.S.A., Montana, Madison County: Gravelly Range: along Forest Road 292, ca 1/4 air mi S of Call Road Reservoir, ca 17 air mi SSW of Ennis.
Roadside. Phenology: flowering.
1. Polygonum achoreum S. F. Blake.

U.S.A., Wyoming, Platte County: Northwest side Festo Lake ca 2 mi NW of Wheatland.
42° 4.7' N, 105° 0.1' W; unknown, , GPS reading
Disturbed area, with Solanum and Cenchrus. Phenology: flowering & fruiting.

U.S.A., Wyoming, Park County: Absaroka Range: Clarks Fork Valley, roadbed at gate blocking old access road along S side of Swamp Lake, ca 20 mi SE of Cooke City, ca 8 mi SW of junction of Wyo Hwy 296 and US Hwy 212.
Clay road bed bordered by Elymus hispidus, hordeum jubatum, Elymus trachycaulus, and Phleum pratense. Phenology: flowering.

U.S.A., South Dakota, Pennington County: Ca 11 mi SW of Hill City.
43° 52.6' N, 103° 47.8' W; unknown, , Specimen Label
Roadway, with Polygonum aviculare, Medicago. Phenology: flowering & fruiting.