Plants 6–250 cm, self-incom-patible (heads showy). Stems proximally villous to hirsute, distally glandular-pubescent, glands yellowish, purple, or black, lateral branches sometimes surpassing main stems. Leaf blades lanceolate to linear, 3–20 cm × 2–20 mm. Heads in open, corymbiform arrays. Involucres ± globose to campanulate, 4.5–12 mm. Phyllaries ± hirsute or villous, usually glandular-pubescent as well, glands yellowish, purple, or black, apices erect or reflexed, flat. Paleae mostly persistent, mostly connate 1/2+ their lengths. Ray florets (2–)5–22; corollas bright yellow (sometimes with maroon bases), laminae 4–20 mm. Disc florets 25–80+, functionally staminate; corollas 2.5–5 mm, pubescent; anthers yellow to brownish or ± dark purple. Ray cypselae black or brown, sometimes mottled, dull, compressed or ± 3-angled (slightly rounded abaxially, angled 15–45° adaxially), beakless (or nearly so). Disc cypselae 0. 2n = 16.
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