Persicaria wallichii |
Persicaria robustior |
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garden knotweed, garden smartweed, Himalayan knotweed, Kashmir plume |
r enouée robuste, stout dotted smartweed, stout smartweed |
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Habit | Plants perennial, 3–20 dm; roots also sometimes arising from proximal nodes; rhizomes present, stolons sometimes present. | |
Stems | ascending, usually branched proximally, scarcely ribbed, glabrous, glandular-punctate; branches sometimes creeping and rooting at nodes. |
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Leaves | ocrea light brown, cylindric, 10–15 mm, chartaceous, base inflated, margins truncate, ciliate with bristles 3–12 mm, surface strigose, glandular-punctate; petiole 0.2–2 cm, glandular-punctate; blade without dark triangular or lunate blotch adaxially, lanceolate to elliptic-lanceolate, 4–20 × 2–4.5 cm, base tapered, margins antrorsely strigose, apex acute to acuminate, faces glabrous or main veins scabrous, glandular-punctate. |
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Inflorescences | terminal and axillary, erect, uninterrupted, 20–80 × 5–10 mm; peduncle 5–40 mm, glandular-punctate; ocreolae usually overlapping, margins eciliate or proximal ones sometimes ciliate with bristles to 1 mm. |
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Pedicels | ascending to spreading, 2–5 mm. |
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Flowers | 2–4 per ocreate fascicle, homostylous; perianth greenish proximally, white distally, glandular-punctate with punctae ± uniformly distributed, slightly accrescent; tepals 5, connate ca.1/3 their length, obovate, 3.2–4.2 mm, veins prominent or not, not anchor-shaped, margins entire, apex obtuse to rounded; stamens 6–8, included; anthers pink or red, elliptic; styles 3, connate proximally. |
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Achenes | included or apex exserted, dark brown to brownish black, 3-gonous, 2.7–3.6 × 2–2.5 mm, shiny, smooth. |
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Persicaria wallichii |
Persicaria robustior |
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Phenology | Flowering Jul–Oct. | |
Habitat | Peaty shores, often in water on coastal plain or near coast | |
Elevation | 0-1500 m (0-4900 ft) | |
Distribution |
CA; MA; OR; BC; Asia
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CT; DE; FL; IN; KY; MA; MD; ME; MI; MO; NH; NJ; NY; OH; PA; RI; TX; VA; NS; ON; QC; Central America; South America; West Indies
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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 robustior often is synonymized with P. punctata. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 5, p. 581. | FNA vol. 5, p. 584. |
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 punctatum var. robustius, P. punctata var. robustior, Polygonum punctatum var. majus, Polygonum robustius |
Name authority | Greuter & Burdet: Willdenowia 19: 41. (1989) | (Small) E. P. Bicknell: Bull. Torrey Bot. Club 36: 455. (1909) |
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