Fringed Water-plantain - Damasonium californicum
State Rank Reason (see State Rank above)
Collected once in Montana along the Kootenai river near Rexford prior to the creation of Lake Koocanusa.
Cormose. Scapes 20–40 cm. Leaf blades lanceolate to narrowly elliptic, 3–12 cm long. Inflorescence a raceme of 1 to 4 whorls; bracts ovate, 4–10 mm long. Flowers unisexual, female below the male; sepals oblong to ovate, reflexed, 4–5 mm long; petals rhombic, white with a yellow, clawed base, 7–10 mm long, erose-margined; stamens 6; pistils 6 to 10. Achenes compressed-obovoid 3–6 mm long with a beak 3–6 mm long, spreading at maturity, tightly packed in a wheel-like head (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)