Perennial from a woody, branched caudex. Stems ascending to erect, simple, 30–70 cm. Herbage densely hirsute, hispid. Leaves cauline, sessile, lanceolate, 3–8 cm long. Inflorescence branched, bracteate, terminal, helicoid cymes. Flowers: calyx hispid, deeply divided into unequal segments, 6–12 mm long; corolla villous, white with green lobes, tubular-funnelform, 12–14 mm long, lobes 2–3 mm long; fornices absent; anthers at the top of the tube; style exserted; anthers and style maturing before the corolla opens. Nutlets 1–4, ovate, smooth, 3–5 mm long; scar basal without a rim (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Our plants are variety
occidentale (Mack.) I.M.Johnst.
POLLINATORS The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap:
Bombus bifarius,
Bombus centralis,
Bombus flavifrons,
Bombus mixtus,
Bombus rufocinctus,
Bombus sylvicola,
Bombus occidentalis, and
Bombus insularis (Macior 1974).