Polygonum parryi |
Polygonum paronychia |
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Parry's knotweed, Parry's or prickly knotweed, prickly knotweed |
beach knotweed, beach or black or dune knotweed, black knotweed, dune knotweed |
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Habit | Herbs, compact, often cushion-like. | Shrubs or subshrubs. |
Stems | erect, green-brown, simple or branched from base, not wiry, 2–5(–8) cm, glabrous. |
prostrate or ascending, brown, branched, rooting at nodes, not wiry, 10–100 cm, glabrous, covered with remains of lacerate, hyaline ocreae. |
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, articulated to ocreae, basal leaves caducous or persistent, distal leaves not reduced in size; ocrea 15–20 mm, glabrous, proximal part cylindric to funnelform, distal part silvery, entire or slightly lacerate, disintegrating into persistent white-gray curly fibers; petiole 0–0.5 mm; blade 1-veined, without pleats, linear to oblanceolate, (5–)10–20(–33) × 3–8 mm, coriaceous, margins revolute, smooth, apex acute or mucronate. |
Inflorescences | axillary; cymes in most axils, 1-flowered. |
axillary; cymes crowded in distal axils, 2–5-flowered. |
Pedicels | absent. |
enclosed in ocreae, erect to spreading, 2–5 mm. |
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. |
semi-open or open; perianth (4.5–)6–10 mm; tube 22–48% of perianth length; tepals partially overlapping, uniformly pink or white, reddish brown when dried, petaloid, oblong-ovate to ± lanceolate, apex rounded; midveins pinnately branched; stamens 8. |
Achenes | slightly exserted from perianth at maturity, dark brown, ovate, 1.2–1.6(–2) mm, faces subequal, shiny, smooth. |
enclosed in or slightly exserted from perianth, black, ovate, 4–5 mm, faces subequal, shiny, smooth. |
Polygonum parryi |
Polygonum paronychia |
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Phenology | Flowering May–July. | Flowering Mar–Sep. |
Habitat | Vernally moist, open, sandy or rocky places | Coastal sands, scrub along coast |
Elevation | 500-2000 m (1600-6600 ft) | 0-50 m (0-200 ft) |
Distribution |
CA; WA
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CA; OR; WA; BC
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Discussion | Polygonum paronychia may be cultivated in rock gardens in open sites with sandy soil. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 5, p. 563. | FNA vol. 5, p. 562. |
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) | Chamisso & Schlechtendal: Linnaea 3: 51. (1828) |
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