Common Burdock - Arctium minus
Lesser Burdock, Little Burdock
Stems erect, branched, 30–120 cm. Leaves with hollow petioles; blades 5–20 cm long, glandular, sparsely tomentose beneath, becoming glabrate. Inflorescence racemose, heads on peduncles 5–20 mm long. Involucre 15–30 mm wide, glabrate to loosely tomentose. Disk flowers ca. 30; corolla pink to purple, 7–12 mm long. Pappus 1–4 mm long. Achenes 4–6 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
The following animal species have been reported as pollinators of this species or genera where their geographic ranges overlap: Bombus vagans
, Bombus rufocinctus
, and Bombus impatiens
(Plath 1934, Colla and Dumesh 2010, Koch et al. 2012).