Stems stout, glabrous or at most hairy in lines. Leaf blades linear-lanceolate or-oblanceolate, proximal cauline margins shallowly serrate, mid to distal entire. Heads 1–100+, borne singly or congested at ends of lateral branches, usually subtended by large foliaceous bracts. Involucres 4–7.2 mm. Phyllaries: outer 2.6–6.3 × 0.4–1 mm, inner 4–7.4 × 0.2–1.1 mm, outer 2 / 3 + length of inner. Ray florets 18–45; corollas usually pale to dark purplish blue, sometimes white, laminae 4.2–10.1 mm. Disc florets 18–52; corollas 3.3–5.7 mm, limbs 2–3.8 mm, lobes 0.5–1.1 mm. Cypselae 0.7–2.7; pappi 3.7–6.4 mm. 2n = 64.
Home