Polygonum argyrocoleum Steud. ex G. Kunze

Herbs annual. Stems erect, 50-80 cm tall, glabrous, angulate, much branched; branches ascending, fastigiate, nodes inflated, internodes 3-5 cm. Leaves caducous; petiole short, articulate at base; leaf blade usually caducous, lanceolate or linear-lanceolate, 1.5-4 cm × 6-8 mm, both surfaces with conspicuous veins, base narrowly cuneate, apex acute; ocrea lower part brown, upper part white, tubular, membranous, 6-8-veined, lacerate at apex. Inflorescence terminal, spicate, interrupted. Pedicel slender, articulate at apex. Perianth green, margin pinkish or white, 5-parted; tepals elliptic, ca. 2 mm. Stamens 7 or 8; filaments dilated at base. Styles 3; stigmas capitate. Achenes included in persistent perianth, brown, shiny, ovoid, trigonous, 2-2.5 mm, smooth. Fl. Jun-Jul, fr. Jul-Aug.

Plants green, heterophyllous. Stems erect or decumbent, branched mostly from base, not wiry, 15-100 cm. Leaves: ocrea 4-8 mm, proximal part cylindric, distal part soon disintegrating into curly or straight fibers; petiole 0-1.5 mm; blade bluish green, lanceolate or linear-lanceolate, 15-50 × 2-8 mm, margins flat, apex acute; stem leaves 2.1-4 times as long as branch leaves; distal leaves abruptly reduced and not overtopping flowers (shorter than or equaling flowers). Inflorescence axillary and terminal, spikelike; cymes aggregated at tips of stems and branches, 4-6-flowered, bracts inconspicuous. Pedicels enclosed in ocreae, 1-2 mm. Flowers closed; perianth 1.8-2.4 mm; tube 10-22% of perianth length; tepals overlapping, green or white, usually with pink, rarely red or white, margins, petaloid, not keeled, oblong to obovate, cucullate; midveins usually unbranched; stamens 7-8. Achenes enclosed in perianth, brown, ovate, 3-gonous, 1.3-2.3 mm, faces subequal, slightly concave, apex not beaked, with concave edges, shiny, smooth; late-season achenes unknown.

Gansu, Nei Mongol, Qinghai, Xinjiang [Afghanistan, Kazakhstan, Kyrgyzstan, Mongolia, Russia, Tajikistan, Turkmenistan, Uzbekistan; SW Asia].

introduced; Ariz., Calif., Colo., Fla., Idaho, La., Mass., Mo., Nev., N.Mex., N.C., Tex., Utah, Vt., W.Va.; c Asia.

Flowering May-Oct.

Marshy areas, streamsides; 200-2500 m.

Fields, gardens, disturbed sites, often in saline soils; 0-1200m.

Polygonum deciduum is a species of flowering plant in the family Polygonaceae, native to Uzbekistan. It was first described in 1856.

It has also been treated as a synonym of Polygonum argyrocoleon Steud. ex Kunze.

Polygonum argyrocoleon là một loài thực vật có hoa trong họ Rau răm. Loài này được Steud. ex Kunze miêu tả khoa học đầu tiên năm 1847.

帚蓼（学名：Polygonum argyrocoleon），为蓼科蓼属下的一个种。