Persicaria wallichii |
Persicaria orientalis |
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garden knotweed, garden smartweed, Himalayan knotweed, Kashmir plume |
kiss-me-Over-the-garden-gate, Prince's-feather smartweed, princess-feather, renouée orientale |
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Habit | Plants annual, 6–25 dm; roots not also arising from proximal nodes; rhizomes and stolons absent. | |
Stems | erect, simple or branched distally, usually ribbed, strigose or glabrescent proximally, pilose to hirsute distally. |
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Leaves | ocrea brownish proximally, green distally, narrowly funnelform, 10–20 mm, chartaceous proximally, foliaceous distally, rarely chartaceous throughout, base inflated or not, margins truncate, ciliate with bristles 1–3 mm, surface densely strigose to hispid, not glandular-punctate; petiole 1–8.5(–14) cm, densely pilose to hirsute; blade without dark triangular or lunate blotch adaxially, ovate, 6–25(–30) × 3–17 cm, base cordate to truncate, margins scabrous to ciliate, apex acuminate, faces minutely strigose to densely hirsute, especially along veins abaxially, not glandular-punctate. |
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Inflorescences | mostly terminal, nodding or erect, uninterrupted, 10–150 × 8–18 mm; peduncle 20–100 mm, hirsute; ocreolae overlapping, margins ciliate with bristles 0.2–1 mm. |
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Pedicels | ascending to spreading, 1–4 mm. |
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Flowers | (1–)2–5 per ocreate fascicle, homostylous; perianth roseate to red, glabrous, not glandular-punctate, slightly accrescent; tepals 5, connate in proximal 1/3, obovate, 3–4.5 mm, veins prominent or not, not anchor-shaped, margins entire, apex obtuse to rounded; stamens 6–8, included or exserted; anthers pink or red, elliptic; styles 2, connate proximally. |
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Achenes | included, dark brown to black, discoid, 2.5–3.5 × 3–3.5 mm, shiny to dull, smooth to minutely granulate. |
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Persicaria wallichii |
Persicaria orientalis |
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Phenology | Flowering Jun–Oct. | |
Habitat | Moist waste places | |
Elevation | 0-500 m (0-1600 ft) | |
Distribution |
CA; MA; OR; BC; Asia
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AL; AR; CA; CT; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; NC; NE; NH; NJ; NY; OH; OK; OR; PA; RI; SC; TN; TX; VA; VT; WI; WV; NB; ON; QC; s Asia (India) [Introduced in North America]
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Discussion | Varieties 2 (1 in the flora). Persicaria wallichii is an ornamental that escapes infrequently in the flora area. A population in Nova Scotia apparently was ephemeral. Plants with leaf blades sparsely to densely pubescent abaxially and pedicels glabrous are var. wallichii, to which naturalized North American plants appear to be referable. Plants with leaf blades brownish-tomentose abaxially and pedicels usually pubescent are var. tomentosa S. P. Hong, which may be in cultivation in North America. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Persicaria orientalis was introduced as a garden ornamental. It often persists around homesteads and barnyards, and occasionally escapes and becomes weedy in moist waste places. A collection made in 1853 by F. V. Hayden at Fort Pierre, South Dakota (MO), is assumed to have come from a cultivated plant. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 5, p. 581. | FNA vol. 5, p. 591. |
Parent taxa | Polygonaceae > subfam. Polygonoideae > Persicaria > sect. Rubrivena | Polygonaceae > subfam. Polygonoideae > Persicaria > sect. Persicaria |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Polygonum polystachyum, Aconogonon polystachyum, Pleuropteropyrum polystachyum, Reynoutria polystachya, Rubrivena polystachya | Polygonum orientale |
Name authority | Greuter & Burdet: Willdenowia 19: 41. (1989) | (Linnaeus) Spach: Hist. Nat. Vég. 10: 537. (1841) |
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