Annual. Stems erect, often branched, 10–80 cm, often puberulent. Herbage glabrate. Leaves short-petiolate to sessile, lanceolate, serrate 2–15 cm long. Inflorescence: heads few, nodding at maturity; peduncles 1–4 cm long. Involucre: outer phyllaries 5 to 8, spreading to reflexed, linear-oblanceolate, 15–40 mm long, minutely ciliate; inner phyllaries narrowly ovate, 7–12 mm long. Rays 6 to 8 (absent); ligules 2–15 mm long. Disk corollas 3–4 mm long. Pappus of usually 4 awns 2–4 mm long. Achenes 4-angled, compressed, 5–6 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Vernally inundated, often disturbed shores of streams, ponds, lakes, marshes; plains, valleys (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
The following animal species have been reported as pollinators of this species or genera where their geographic ranges overlap: Bombus griseocollis
and Bombus impatiens
(Plath 1934, Colla and Dumesh 2010).