Persicaria wallichii |
Persicaria capitata |
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garden knotweed, garden smartweed, Himalayan knotweed, Kashmir plume |
Himalayan smartweed, Japanese knotweed, pink bubble persicaria, pink-head knotweed, pink-head persicaria, pinkhead smartweed |
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Habit | Plants annual or perennial, 0.5–5 dm; roots also often arising from proximal nodes. | |
Stems | prostrate, glabrous or glandular-pubescent. |
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Leaves | ocrea brown or reddish brown, cylindric to funnelform, 5–12 mm, chartaceous, base inflated or not, margins oblique, eciliate or ciliate with bristles to 1.5 mm, surface lanate, sometimes also glandular-pubescent; petiole 2–5 mm, winged distally; blade ovate to elliptic, 1.5–4(–6) × 0.6–2.5(–3.3) cm, base cuneate or tapering, margins ciliate with reddish, multicellular hairs, apex acute, faces glandular-pubescent abaxially and adaxially, not glandular-punctate. |
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Inflorescences | terminal, 5–20 × 7-18 mm; peduncle 10–40 mm, glabrous or stipitate-glandular in distal 1/5; ocreolae overlapping, margins eciliate. |
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Pedicels | spreading, 0.5–1 mm. |
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Flowers | 1–5 per ocreate fascicle; perianth greenish white proximally, pinkish distally, urceolate, glabrous, nonaccrescent; tepals 5, elliptic, 2–3 mm, apex acute to obtuse; stamens 8, filaments distinct, free; anthers pink to red, elliptic; styles 3, connate to middle or distally. |
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Achenes | included, reddish brown to brownish black, 3-gonous, 1.5–2.2 × 1–1.5 mm, shiny, smooth or minutely punctate. |
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Persicaria wallichii |
Persicaria capitata |
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Phenology | Flowering Jun–Sep. | |
Habitat | Disturbed, urban places | |
Elevation | 0-500 m (0-1600 ft) | |
Distribution |
CA; MA; OR; BC; Asia
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CA; LA; OR; Asia (Bhutan, w China, n India, Nepal) [Introduced in North America; introduced also in the Pacific Islands (Hawaii)]
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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 capitata is planted as a garden groundcover. It escapes infrequently in the flora area; once established outside of cultivation it can be difficult to eradicate. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 5, p. 581. | FNA vol. 5, p. 579. |
Parent taxa | Polygonaceae > subfam. Polygonoideae > Persicaria > sect. Rubrivena | Polygonaceae > subfam. Polygonoideae > Persicaria > sect. Cephalophilon |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Polygonum polystachyum, Aconogonon polystachyum, Pleuropteropyrum polystachyum, Reynoutria polystachya, Rubrivena polystachya | Polygonum capitatum |
Name authority | Greuter & Burdet: Willdenowia 19: 41. (1989) | (Buchanan-Hamilton ex D. Don) H. Gross: Bot. Jahrb. Syst. 49: 277. (1913) |
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