Annuals. Stems (10-)20-50(-80) cm tall, erect, branched, glabrous or bearing rarely indistinct hairs. Leaves bi-or tripinnatisect with narrow lanceolate or linear-lanceolate to linear segments, with small teeth and incisions on petioles, usually sparsely fine hairy to subglabrous. Capitula discoid, solitary (or 2 or 3) at stem and branch apices, on long peduncles, narrow, subcylindric; calycular bracts linear, shorter than achenes; outer phyllaries green, narrowly linear, herbaceous, finely hairy, shorter than inner ones, inner greenish brown, linear-lanceolate, bearing rarely short bristles only on margin. Florets all tubular, yellow, few. Achenes linear-tetragonal, ± compressed, beset with upright lucid bristles along ribs, otherwise glabrous or finely hairy, unequal in length; inner 15-20(-25) mm, outer shorter, 2 upright awns, 4-5 mm, at top of achenes. Fl. Jul-Sep.
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A herb. It grows each year from seed. It grows 20-80 cm tall. The leaves are divided 2 or 3 times. The segments are narrow.
Coastal and riverside precipices and rocks, sandy banks, rocky outcrops. Sometimes found as ruderales by stony fences, walls etc.
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It is a temperate plant. It grows in marshes and along streams. It grows in wetlands. In Sichuan.
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