Comments
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Persicaria longiseta is morphologically similar to another Asian species, P. posumbu (Buchanan-Hamilton ex D. Don) H. Gross (= P. caespitosa). Its spread in the United States since its introduction near Philadelphia in 1910 was summarized by A. K. Paterson (2000).
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Description
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Plants annual, 3-8 dm; roots also often arising from proximal nodes; rhizomes and stolons absent. Stems decumbent to ascending, branched, without noticeable ribs, glabrous. Leaves: ocrea hyaline to brownish, cylindric, 5-12 mm, chartaceous, base sometimes inflated, margins truncate, ciliate with bristles 4-12 mm, surface glabrous or strigose, not glandular-punctate; petiole 0.1-0.3(-0.6) cm, glabrous, leaves sometimes sessile; blade without dark triangular or lunate blotch adaxially, ovate-lanceolate to linear-lanceolate, 2-8 × 1-3 cm, base tapering to cuneate, margins antrorsely strigose, apex acute to acuminate, faces glabrous or sparingly strigose along veins abaxially, glabrous or strigose along midvein and margins adaxially, not glandular-punctate. Inflorescences terminal, sometimes also axillary, erect, uninterrupted, 10-40(-80) × 3-7 mm; peduncle 10-50 mm, glabrous; ocreolae overlapping, margins ciliate with bristles (0.5-)1-4(-6) mm. Pedicels ascending, 1-2 mm. Flowers 1-5 per ocreate fascicle, homostylous; perianth pinkish green proximally, roseate distally, glabrous, not glandular-punctate, scarcely accrescent; tepals 5, connate ca. 1/ 3 their length, obovate, 2.2-2.8 mm, veins not prominent, not anchor-shaped, margins entire, apex obtuse to rounded; stamens 5, included; anthers yellow, elliptic to ovate; styles 3, connate proximally. Achenes included, dark brown to black, 3-gonous, 1.6-2.3 × 1.1-1.6 mm, shiny, smooth.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Description
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Ascending-erect, 15-60 cm high, glabrous, branched from base or above, annual herb. Stem brownish or reddish brown, glabrous, canaliculate. Leaves 2.5-12 x 0.75-3.5 cm, lanceolate-elliptic, acuminate, hairy, entire, with a rounded or cordate base, petiole 2-7 mm long. Ochrea 8-20 mm long, ovate, tubular, setose or ciliate, cilia almost equalling the ochreae or longer. Inflorescence very laxly flowered, interrupted 0.8-4.0 cm long, terminal-axillary raceme. Flowers up to 2.0 mm across, pedicel 1.0 mm long. Ochreolae 1.0-3.0 mm long, setose or ciliate, cilia 1.0-4.0 mm long. Tepals 5, biseriate, unequal, red, pink or whitish, ovate-obovate, obtuse. Stamens 5-8, filaments long. Ovary trigonous, rounded, with 3 styles, styles free above, fused below. Nuts trigonous, shining, black.
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Distribution
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Himalaya (Kashmir to Nepal), N. Burma, China, Japan, Malaysia.
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Distribution
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introduced; B.C., N.B., Ont.; Ala., Conn., Del., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Nebr., N.J., N.Y., N.C., Ohio, Pa., S.C., Tenn., Tex., Vt., Va., W.Va., Wis.; e Asia; introduced also in Europe.
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Distribution
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Distribution: Kashmir to Nepal, extending upto Japan through N. Myanmar and China.
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Elevation Range
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2100-2400 m
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Flower/Fruit
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Fl. Per.: May-August.
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Flowering/Fruiting
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Flowering May-Oct.
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Habitat
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Floodplain forests and woodlands, shorelines of ponds, moist roadsides, waste places; 0-300m.
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Habitat
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A fairly common species from plains to 2500 m, grows in ditches, moist places. Often confused with Persicaria salicifolia (Brous. ex Willd.). See discussion under excluded species.
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Synonym
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Polygonum longisetum Bruijn in F. A. W. Miquel, Pl. Jungh. 3: 307. 1854; Persicaria caespitosa (Blume) Nakai var. longiseta (Bruijn) C. F. Reed; Polygonum caespitosum Blume var. longisetum (Bruijn) Steward
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Synonym
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Polygonum longisetum De Bruyn in Miq., Pl. Jungh. 307. 1854; Polygonum serrulatum auct. non Lag. 1817 sensu Hook.f., Fl. Brit. Ind. 1: 38. 1886; R. R. Stewart, Ann. Cat. Vasc. Pl. W. Pak. & Kashm. 212. 1972; Polygonum caespitosum Bl. var. longisetum (De Bruyn) Danser, Polyg. Nied. 170. 1927; Persicaria caespitosa var. longiseta (De Bruyn) C. F. Reed in Phytologia 63 (5): 410. 1987.
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