State Rank Reason (see State Rank above)
Widely, though sporadically distributed across Montana. Usually not abundant where found.
Usually biennial. Stems branched, 20–80 cm. Leaves oblanceolate and petiolate below to lanceolate and sessile above, 4–12 cm long, deeply lobed to serrate. Flowers light yellow with pinnatifid bracts below the hypanthium, nocturnal; sepals 2–3 cm long; petals 5, lanceolate, 3–6 cm long. Capsule broadly cylindric, 2–4 cm long; seeds flattened, broadly winged, horizontal in several columns (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)