Polygonum dichotomum

水紅骨蛇

Polygonum dichotomum Bl.

名彙資訊

特徵描述

典藏標本

數位照片

分布位置

相關資訊

Bl., Bijdragen tot de flora van Nederlandsch Indië 529. 1825. (Bijdr. Fl. Ned. Ind.)

Polygonum sagittatum auct. non L.

Henry, A List of Plants from Formosa 76. 1896. (List Pl. Formos.)
Persicaria sieboldii (Meisn.) Ohki

Sasaki, List Pl. Form. (Sasaki) 170. 1928.
Polygonum tairae Ohwi

Ohwi, Journal of Japanese Botany 13: 335. 1937. (J. Jpn. Bot.)
Persicaria dichotoma (Bl.) Masam.

Masam., Science Reports of Kanazawa University 2: 82. 1954. (Sci. Rep. Kanazawa Univ., Biol.)
Polygonum sieboldii Meisn

Hsu, Polyg. Taiwan 30. fig. 32. 1967.
Polygonum hastatoauriculatum auct. non Makino

Chang, Forest. J. 25: 5. 1983.

herb

Annual ascending or decumbent herbs, to 100 cm tall; stems branched, angled, armed with recurved prickles; nodes enlarged.
Leaves lanceolate, 2.5–10.5 cm long, 1–2 cm wide, apex acute to acuminate, base cuneate to weakly sagittate, both surfaces glabrous, beneath midvein retrorsely prickly; petioles 0.5–1 cm long; ocreae tubular, 1.5–2 cm long, apex oblique, loosely strigose at veins, upper margins eciliate.
Inflorescences 2–3-flowered fascicles in spike-like panicles, terminal or in axils of upper leaves, usually dichotomous branched, densely flowered, 1–2 cm long; peduncles glandular, 1–4 cm long; bracts ovate, glabrous, apex acute, upper margins ciliate. Flowers white to pink; pedicels included; perianth segments 5, elliptic, 2–4 mm long, apex obtuse; stamens 5; styles 2-cleft, included; nectaries present.
Achenes dark brown, biconvex, smooth, shining, 2–3 mm long.

台灣 : in wet grassy places and stream banks at low altitudes.
世界 : Northern India, Thailand, Vietnam, Laos, Malaysia, the Philippines, south to northeastern Australia, S China, Yakushima and the Ryukyus.