Perennials (biennials?), 40–100 (–200) cm (caudices foreshortened, roots fleshy-fibrous). Herbage (often sea-green, usually glaucous) glabrous. Stems single or 2–4 loosely clustered. Leaves progressively reduced distally; ± petiolate; blades elliptic to oblanceolate, 5–20+ × (1–) 2–10 cm, bases tapered, margins denticulate or entire (mid and distal leaves sessile, bractlike). Heads 20–40 (–80+) in compound corymbiform arrays. Calyculi of 2–4+ bractlets (less than 2 mm). Phyllaries ± 8 or ± 13, 5–8 mm, tips frequently black. Ray-florets (0) ca. 5; corolla laminae 3–5 mm. Cypselae glabrous. 2n = 40.

Phenology: Flowering spring–early summer.
Habitat: Marshes, swampy places, standing water, alkaline sites
Elevation: (0–)200–2500 m

Distribution

• Generated Map
• Legacy Map

B.C., Calif., Colo., Idaho, Mont., Nev., Oreg., S.Dak., Utah, Wash., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.