Plants (50–)100–200 cm (solitary or clustered); rhizomes creeping, elongate. Stems 1–10+, erect, scabroso-puberulent proximal to arrays distally, in strips proximal to leaves. Leaves: basal 0; mid and distal cauline sometimes numerous (75+) , somewhat crowded, sessile, blades (dark green) linear-lanceolate to lanceolate, 25–150 × 2–15 mm, margins serrate to entire, scabroso-ciliate, 3-nerved, faces glabrous or with short hairs in lines along nerves. Heads 50–350, in secund, usually elongate, pyramidal paniculiform arrays, branches recurved and secund. Peduncles 1–5 mm, sparsely to moderately strigillose; bracteoles 1–3, linear-lanceolate. Involucres narrowly campanulate, 3–5 mm. Phyllaries in 3–4 series, strongly unequal (greenish) , outer lanceolate, inner oblong-lanceolate, margins ciliate-fimbriate apically, midnerves swollen apically, apices obtuse to rounded, glabrous. Ray florets 10–15; laminae 2–3 × 0.1–0.6 mm. Disc florets 6–10; corollas 3–4 mm, lobes 0.6–1.1 mm. Cypselae (narrowly obconic) 1.1–1.5 mm (ribbed), sparsely stri-gillose; pappi 2.5–3 mm. 2n = 18, 36, 54.
Damp soil of the coastal plain. Wet soils, thickets, edges of bogs along the coastal plain at elevations of 10-40 metres.
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