Polygonum parryi |
Polygonum bidwelliae |
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Parry's knotweed, Parry's or prickly knotweed, prickly knotweed |
Bidwell knotweed, Bidwell's knotweed |
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Habit | Herbs, compact, often cushion-like. | Herbs. |
Stems | erect, green-brown, simple or branched from base, not wiry, 2–5(–8) cm, glabrous. |
erect, green, simple or divaricately branched, ± wiry, 2–20 cm, minutely papillose-scabridulous. |
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. |
crowded at branch tips, not articulated to ocreae, basal leaves caducous or persistent, distal leaves abruptly reduced to bracts; ocrea 8–13 mm, papillose-scabridulous, proximal part cylindric, distal part overlapping and obscuring leaves and flowers, silvery, entire or shallowly dentate; petiole absent; blade 3-veined, without pleats, linear, 5–15(–20) × 0.5–1.5(–2) mm, margins revolute, papillose-denticulate, apex spine-tipped. |
Inflorescences | axillary; cymes in most axils, 1-flowered. |
axillary; cymes in distal axils, 1-flowered. |
Pedicels | absent. |
absent. |
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. |
closed; perianth 2–3 mm; tube 10–18% of perianth length; tepals overlapping, pink with pink or white margins, petaloid, elliptic, navicular, apex acute to acuminate; midveins unbranched; stamens 8. |
Achenes | slightly exserted from perianth at maturity, dark brown, ovate, 1.2–1.6(–2) mm, faces subequal, shiny, smooth. |
enclosed in perianth at maturity, light brown to brown, ovate-elliptic, 1.8–2.3 mm, faces subequal, shiny, smooth. |
Polygonum parryi |
Polygonum bidwelliae |
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Phenology | Flowering May–July. | Flowering May–Jun. |
Habitat | Vernally moist, open, sandy or rocky places | Thin volcanic soils, chaparral, montane woodland valleys, grasslands |
Elevation | 500-2000 m (1600-6600 ft) | 60-1200 m (200-3900 ft) |
Distribution |
CA; WA
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CA
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Discussion | Polygonum bidwelliae occurs in the Cascade Range and northeastern Sacramento Valley in Butte, Shasta, and Tehama counties. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 5, p. 563. | FNA vol. 5, p. 565. |
Parent taxa | Polygonaceae > subfam. Polygonoideae > Polygonum > sect. Duravia | Polygonaceae > subfam. Polygonoideae > Polygonum > sect. Duravia |
Sibling taxa | ||
Name authority | Greene: Bull. Torrey Bot. Club 8: 99. (1881) | S. Watson: Proc. Amer. Acad. Arts 14: 294. (1879) |
Web links |
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