Taprooted with a usually simple crown. Stems usually simple, 10–50 cm. Herbage puberulent to tomentose. Leaves spreading to erect, opposite to subopposite; blades lance-linear to ovate, 4–15 cm long. Umbels of 20 to 80 flowers; peduncles 2–15 mm long. Flowers 9–12 mm high; sepals 2–3 mm long, glabrate; petals green, puberulent, 4–7 mm long; gynostegium light green, glabrous, 2–3 mm high; hoods oblong, 4–5 mm long with a pair of shallow, marginal lobes at midlength and a dorsal, petal-like appendage; horns absent. Follicles erect, ovoid-fusiform, smooth, glabrate to puberulent, 7–10 cm long (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
POLLINATORS The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap:
Bombus vagans,
Bombus huntii,
Bombus rufocinctus,
Bombus ternarius,
Bombus terricola,
Bombus pensylvanicus,
Bombus bimaculatus,
Bombus griseocollis,
Bombus impatiens,
Bombus insularis, and
Bombus flavidus (Plath 1934, Heinrich 1976, Thorp et al. 1983, Colla and Dumesh 2010, Colla et al. 2011, Koch et al. 2012, Williams et al. 2014, Tripoldi and Szalanski 2015).