Parthenium alpinum Torr. & A.Gray

Perennials, 1–2 cm (underground caudices 2–5+ cm, branched; plants cespitose or forming mats). Leaf blades oblanceolate to spatulate, 6–18(–35) × 1–3(–4+) mm, margins entire, faces strigilloso-sericeous (gray) and obscurely gland-dotted. Heads ± disciform, borne singly. Peduncles 0–5(–30) mm. Phyllaries: outer 5–8 ± linear, 4 mm, inner 5–8 ± orbiculate, 4–5 mm. Pistillate florets 5–8; corolla laminae 0 (tubes ± compressed, obscurely 2–4-lobed). Disc florets 18–28+. Cypselae oblanceoloid, 4 mm (narrowly winged); pappus-like enations 2, erect to spreading, ± subulate, 0.5–1 mm (a third, ± subulate element sometimes at apex of adaxial face). 2n = 36.