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Vigorous, erect or semi-procumbent herb to 1.5 m, rooting at nodes on wet ground; stem ± fleshy, large stems woody and hollow, sometimes ribbed, glabrous or sparsely pubescent, sometimes with glandular hairs. Leaves sessile or shortly petiolate, blade triangular, broadly ovate, ovate to lanceolate, 4-21 cm long, 0.3-8.5 cm wide, margins sub-entire to serrate, crenulate or sharply dentate, sometimes minutely revolute, apex obtuse to acuminate, glabrous or pubescent. Inflorescence a loose terminal cyme, bracts ± amplexicaul, to 4.4 cm long; capitula few to several, 6-10 mm diameter when mature; stalks of individual capitula 0.4-7.2 cm, pubescent; phyllaries 4-6.5 mm long, 1-1.5 mm wide, flat, basally pubescent, apex obtuse to acute. Florets ± 50; corolla 3-4 mm long, white, 5-6 lobed; anthers free or weakly fused, 5(-6), ± 1 mm long; style conspicuous, 4-6.5 mm long, bifid for ± ? of its length, arms swollen and flattened, glabrous or with a few black hairs. Mature achenes brown, 2-3.5 mm long, tuberculate, glands present on tubercules (and sometimes between); pappus of (2-)3-4(-5) pegs.
Perennial herb, 1.0-1.5 m high; hydrophyte glandular-pilose or glabrous; stems erect or ascending and rooting from lower part. Leaves opposite, broadly lanceolate to narrowly ovate-rhomboid, acuminate, gradually narrowed at base into short petiole or subsessile, margins coarsely and sharply callose-dentate. Capitula discoid; many-flowered, pedunculate, in lax corymbose panicles; involucre campanulate; bracts in ± 2 rows, ± connate at base. Receptacle honeycombed, epaleate. Corolla white or mauve; tubular, widening gradually upwards; lobes 5, shorter than tube, glandular-hairy. Anthers linear, blunt at base; with or without small, apical appendage. Style branches long, dilated above, obtuse, sometimes subpetaloid, papillose on outer surface. Flowering time Jan., Feb.? Pappus of 3 or 5 short, rigid gland-tipped processes. Cypselae 3-angled.
Herb, up to 1 m high. Leaves opposite, gradually narrowed at base into short petiole or almost sessile, margin sharply and irregularly incise-serrate. Corolla (2.5-) 3.0-3.5 mm long, style branches (3-)4-5 mm long. Flowers white.
A very variable erect or decumbent herb up to about 2 ft. high
White florets in rather few large heads.
