Taprooted biennial. Stems erect, 50–100 cm, usually branched. Herbage glandular-hirsute. Leaves long-petiolate; blades ovate, truncate, 7–20 cm long, reduced above. Inflorescence of well-separated verticillasters subtended by sessile, entire, aristate bracts. Flowers: calyx glandular, ca. 1 cm long, lobes aristate; corolla 20–25 mm long, blue and yellow, upper lip erect, middle lobe of lower lip much broader than the lateral lobes; stamens exserted from the upper lip (
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 bifarius,
Bombus melanopygus,
Bombus mixtus,
Bombus nevadensis,
Bombus occidentalis,
Bombus pensylvanicus, and
Bombus impatiens (Thorp et al. 1983, Williams et al. 2014, Tripoldi and Szalanski 2015).