Polygonum parryi |
Polygonum humifusum |
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Parry's knotweed, Parry's or prickly knotweed, prickly knotweed |
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Habit | Herbs, compact, often cushion-like. | |
Stems | erect, green-brown, simple or branched from base, not wiry, 2–5(–8) cm, glabrous. |
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Leaves | ± uniformly distributed, dense, not articulated to ocreae, basal leaves ± persistent, distal leaves gradually reduced to bracts; ocrea 2–4(–5) mm, glabrous, proximal part cylindric, distal part deeply lacerate, disintegrating into white, curled fibers; petiole absent; blade 3-veined, without pleats, linear-lanceolate, subulate, 5–13(–20) × 0.4–1 mm, margins revolute, smooth, apex spine-tipped. |
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Inflorescences | axillary; cymes in most axils, 1-flowered. |
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Pedicels | absent. |
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Flowers | closed; perianth 1.5–2(–2.5) mm; tube 6–15% of perianth length; tepals overlapping, usually reddish with white margins, petaloid, oblong, navicular, apex acute; midveins unbranched; stamens 8. |
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Achenes | slightly exserted from perianth at maturity, dark brown, ovate, 1.2–1.6(–2) mm, faces subequal, shiny, smooth. |
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Polygonum parryi |
Polygonum humifusum |
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Phenology | Flowering May–July. | |
Habitat | Vernally moist, open, sandy or rocky places | |
Elevation | 500-2000 m (1600-6600 ft) | |
Distribution |
CA; WA
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AK; NT; NU; YT; e Asia |
Discussion | Subspecies 2 (1 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 5, p. 563. | FNA vol. 5, p. 555. |
Parent taxa | Polygonaceae > subfam. Polygonoideae > Polygonum > sect. Duravia | Polygonaceae > subfam. Polygonoideae > Polygonum |
Sibling taxa | ||
Subordinate taxa | ||
Name authority | Greene: Bull. Torrey Bot. Club 8: 99. (1881) | C. Merck ex K. Koch: Linnaea 22: 205. (1849) |
Web links |
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