– long-spined stickseed
Distribution: East of the Cascades in the Pacific Northwest; Eurasia.
Habitat: A weed in dry, disturbed places, along roadsides and on overgrazed ranges.
Flowers: May - July
– montane stickseed
Distribution: Occurring east of the crest in north-central Washington; central British Columbia to north-central Washington, east to Montana.
Habitat: Dry meadows and forest openings from low to middle elevations.
– bristly sheepburr, bristly stickseed, common stickseed, European stickseed, bristly-fruited tickweed
Distribution: Occurring east of the Cascades crest in Washington; widely distributed throughout much of North America; Eurasia.
Habitat: Shrub-steppe, disturbed areas, roadside.
Origin: Introduced from Eurasia, possibly native in northern Rocky Mts. (Cronquist et al. 1984)