Polygonum polystachyum

Polygonum polystachyum var. polystachyum :
Afghanistan (Asia)
Burma (Asia)
Bhutan (Asia)
India (Asia)
Nepal (Asia)
Pakistan (Asia)
China (Asia)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.

Polygonum polystachyum Wall. ex Meisn.:
Pakistan (Asia)
Canada (North America)
United States (North America)
China (Asia)
Nepal (Asia)
India (Asia)
Bhutan (Asia)
Burma (Asia)
Afghanistan (Asia)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.

Sichuan, Xizang, Yunnan [Afghanistan, Bhutan, India, Kashmir, Myanmar, Nepal, Pakistan, Sikkim].

Canada

Origin: Exotic

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

United States

Origin: Exotic

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

Afghanistan, Himalaya (Kashmir to NEFA), Tibet, N. Burma, W. China.

Distribution: Afghanistan(?), Himalayas (India, Pakistan), Xizang, N. Myanmar and Western China.

Subshrubs. Stems 80-100 cm, much branched, angulate, pubescent, sometimes glabrous. Petiole large, ca. 1 cm; leaf blade gray-green abaxially, green adaxially, broadly lanceolate, oblong-lanceolate, or lanceolate, 6-17 × 3-7 cm, abaxially densely pubescent, adaxially sparsely pubescent, base hastate-cordate or subtruncate, apex acuminate; ocrea lax, dark brown, tubular, oblique, 3-4 cm, membranous, densely pubescent, not ciliate. Inflorescence terminal, paniculate, spreading; rachis and branches pubescent. Perianth white or pinkish, 5-parted, ca. 4 mm in diam.; tepals unequal; outer 2 tepals small; inner 3 tepals broadly obovate, large, ca. 3 mm; bracts ovate, membranous, pubescent, apex acute. Pedicels longer than bracts, slender, glabrous or sparsely pubescent, apex articulate. Stamens 8, included; anthers purple. Styles 3, free; stigmas capitate. Achenes included in persistent perianth, brown, ovoid, trigonous, ca. 2.5 mm, smooth. Fl. Aug-Sep, fr. Sep-Oct.

2700-4200 m

Erect, 30-100 cm high, branched shrubby perennial. Stem, glabrous to pubescent with short internodes. Leaves 2-15 x 0.5-3.5 cm, oblong-lanceolate, acuminate, base cordate-truncate, hairy on veins, glabrous above sparsely to densely tomentose beneath, subsessile to petiolate. Ochrea tube-like, dark brown 1-2 cm long, membranous. Inflorescence thyrsoid panicles, spreading, pubescent, large with reddish axis. Ochreolae pubescent, ovate, acuminate c. 2 x c. 1.5 mm, pubescent. Flowers 3-5 mm across, very fragrant, pedicel 2-3.5 mm long, selender, jointed. Tepals 5, biseriate, white-cream coloured, unequal, inner ± broadly obovate-spathulate, obtuse, 3-3.5 (-4) mm long, outer 2, oblong, acute, smaller than the inner ones. Stamens 7-8, unequal. Ovary trigonous with 3, free styles and capitate stigma. Nuts trigonous, 3-3.5 x 1.5 mm, shining.

Polygonum polystachyum Wall. ex Meisn. in Wall., Pl. As. Rar. 3: 61. 1832; Hook. f., Fl. Brit. Ind. 5: 50. 1886, including var. glabrum and var. pubescens Wall. ex Meisn. l.c.; Webb & Chater in Tutin et al., Fl. Europ. 1: 80. 1964; R.R.Stewart, Ann. Cat. Vasc. Pl. W. Pak. & Kashm. 208. 1972; Bhopal & Chaudhri in Pak. Syst. 1: 71. 1977; Persicaria polystachya (Wall. ex Meisn.) H. Gross in B. Jahrb. 49: 315. 1913; Hara in Fl. E. Himal. 73. 1966; in Hara et al., Enum. Fl. Pl. Nepal 3: 177. 1982; Aconogonon polystachyum (Meisn.) Haradson in Symb. Bot. Upsal. 22(2): 69. 1978; Grierson & D.G.Long, Fl. Bhutan 1(1): 162. 1983; Pleuropteropyrum polystachyum (Wall. ex Meisn.) Munshi & Javeid, Syst. Stud. Polygon. Kashm. Himal. 78. 1986.

Polygonum polystachyum Wallich ex Meisner in N. Wallich, Pl. Asiat. Rar. 3: 61. 1832, not Persicaria polystachya Opiz 1852; Aconogonon polystachyum (Wallich ex Meisner) M. Král; Pleuropteropyrum polystachyum (Wallich ex Meisner) Munshi & G. N. Javied; Reynoutria polystachya (Wallich ex Meisner) Moldenke; Rubrivena polystachya (Wallich ex Meisner) M. Král

Forests, valleys; 2200-4500 m.

Grows on rocks, slopes, slightly drier places between 1500-3000 m.

Fl. Per.: June-September.

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 2
Species With Barcodes: 1

Canada

Rounded National Status Rank: NNA - Not Applicable

United States

Rounded National Status Rank: NNA - Not Applicable

Rounded Global Status Rank: GNR - Not Yet Ranked

These species are introduced in Switzerland.