Plants 50–180 cm; stolons and rhizomes absent, fallen stems frequently rooting at nodes. Stems erect. Leaf blades linear to oblanceolate, obovate, or oblique-elliptic; cauline 45–120 × 8–12 mm, bases not decurrent. Heads in corymbiform arrays, branches spreading to ascending, most bracts leaflike, 10–40 × 3–8 mm. Peduncles 6–35 mm; bracts (0–)1–3, linear to linear-oblanceolate, 1–2.5 mm. Involucres 2–2.5(–4) × 4–6 mm. Phyllaries in 2–4 series, linear to subulate, subequal, 0–4 merging down peduncle; outer 1.3–2 × 0.3–0.6 mm; inner 1.5–3 × 0.3–0.6. Ray florets 20–35; corollas white to lilac, laminae 5–9 mm, tubes 0.6–0.9 mm. Disc florets 80–134; corollas 2.1–2.9 mm. Cypselae obovoid, 1.3–2.1 × 0.8–1.3 mm, wings 0.2–0.3 mm wide; pappi awns 0.3–0.8 mm. 2n = 18.
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