Volume 14 > Part 1 > Year 2018 > Page 134 > Polygonaceae > Persicaria

8. Persicaria hydropiper (L.) Spach.wfo-0001245275

Hist. Nat. Vég. 10: 536. 1841; Grierson & D.G.Long, Fl. Bhutan 1(1): 162. 1983; Soják, Preslia 46(2): 153. 1974; Kantachot et al., Thai Forest Bull., Bot. 38: 138. 2010.— Polygonum hydropiper L., Sp. Pl. 1: 361. 1753; Lour., Fl. Cochinch. 1: 240. 1790; Meisn., Monogr. Polyg.: 76. 1826; Meisn. In DC., Prodr. 14(1): 109. 1856; Hook.f., Fl. Brit. India 5: 39. 1886; Courchet, Fl. Indo-Chine [P.H.Lecomte et al.] 5: 35. 1910; Merr., Enum. Philipp. Fl. Pl. 2: 122. 1923; Ridl., Fl. Malay. Penins. 3: 12. 1924; Steward, Contr. Gray Herb. 88: 58. 1930; Backer & Bakh.f., Fl. Java 1: 224. 1963; P.H.Hô, Câyco Việtnam 1(2): 947. 1991; Philcox in Dassan. & Clayton, Revis. Handb. Fl. Ceylon 11: 399. 1997; A.J.Li et al. in C.Y. Wu et al., Fl. China 5: 291. 2003; N.T.Do in Bân, Fl. Vietnam 11: 185. 2007.

Accepted Name : This is currently accepted.

Synonyms & Citations :

Description : Erect or procumbent herbs, 30–60 cm tall; stem and branches terete, glabrous with glandular dots. Leaves with petioles (2–)2.5–4.5(–5) mm long, glabrous; lamina (4.5–)5.3–7.5(–8) by (0.8–)1–1.6(–2) cm, ovate, with glandular dots, glabrous on both surfaces, base cuneate or attenuate, apex acute or acuminate, margin entire with hispid hairs; secondary veins 13–15-paired, primary vein glabrous or with hispid hairs on lower surface. Ocreae cylindrical, 1.2–2.5(–3) cm long, scarious, sparsely to moderately pubescent, venation conspicuous, apex truncate, with 12–16 bristles, (3–)4–7.5(–9) mm long. Inflorescences terminal and axillary, spicate panicle, (8.5–)10–19(–24) cm long, erect or sometimes pendulous; inflorescence branches glabrous with glandular dots; side branches (3.5–)5.5–10(–15) cm long, filiform, lax-flowered, rachis conspicuous; leafy bracts 10–25(–40) by 2–4(–6) mm, ovate, apex acute, margin with hispid hairs. Flowers 4–6 in an ocreola; pedicels (2.5–)3–4 mm long, glabrous with glandular dots; bracteoles 1.5–2 mm long, hyaline, with 2 veins; ocreolae completely enclosing rachis, 2.5–3.5 mm long, with glandular dots, apex obtuse or acute, margin entire with hispid hairs. Tepals 5, white or pink; lobes 1.5–2.5 by 1–1.5 mm, ovate, apex obtuse, glandular dots present, veins 3; tube 1–1.2(–1.5) mm long, glandular nectaries 8. Stamens 8, in two whorls, outer ones 1–1.5 mm long, inner ones (1.5–)1.5–2 mm long; anthers white. Styles 3, (0.8–)1–1.8 mm long; stigmas capitate, white. Fruits with scarious perianth, triangular, (2–)2.1–2.5 by (1.4–)1.5–1.9 mm, shiny black.

Thailand : NORTHERN: Mae Hong Son, Chiang Mai, Sukhothai; NORTH-EASTERN: Loei, Sakon Nakhon, Khon Kaen; EASTERN: Chaiyaphum, Nakhon Ratchasima, Ubon Ratchathani; SOUTH-WESTERN: Ratchaburi; CENTRAL: Krung Thep Maha Nakhon (Bangkok).

Distribution : Europe (type), Russia, India, Nepal, Sri Lanka, Sikkim, Bhutan, Bangladesh, Myanmar, China, Korea, Japan, Vietnam, Peninsular Malaysia, Sumatra, Java, the Philippines, Australia, N America.

Ecology : River banks, rice fields, streamsides in hill evergreen forests, 300–1,000 m alt.

Vernacular : Phak phai nam (ผักไผ่น้ำ), phak phai nam yot daeng (ผักไผ่น้ำยอดแดง)(Northern), phak bung thong daeng (ผักบุ้งท้องแดง), bae lao kieo (เบ๋เหลาเกี้ยว).