Polygonum parryi |
Polygonum californicum |
|
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Parry's knotweed, Parry's or prickly knotweed, prickly knotweed |
California knotweed |
|
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, 4–40 cm, 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. |
uniformly distributed, not articulated to ocreae, basal leaves usually caducous, distal leaves abruptly reduced to bracts; ocrea 5–10 mm, glabrous or papillose-scabridulous, proximal part cylindric, distal part white or tawny, disintegrating into ± bristly-fringed fibers; petiole absent; blade 3-veined, without pleats, linear, 5–25(–30) × 0.5–2 mm, margins revolute, papillose-denticulate or smooth, apex mucronate or weakly 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. |
open or closed; perianth 2.5–3.5 mm; tube 10–20% of perianth length; tepals overlapping, uniformly white to pink, 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 or slightly exserted from perianth, brown, narrowly elliptic, 1.8–2.2 mm, faces subequal, shiny, smooth. |
Polygonum parryi |
Polygonum californicum |
|
Phenology | Flowering May–July. | Flowering May–Sep. |
Habitat | Vernally moist, open, sandy or rocky places | Open places, including serpentine |
Elevation | 500-2000 m (1600-6600 ft) | 40-1200 m (100-3900 ft) |
Distribution |
CA; WA
|
CA; OR
|
Source | FNA vol. 5, p. 563. | FNA vol. 5, p. 564. |
Parent taxa | Polygonaceae > subfam. Polygonoideae > Polygonum > sect. Duravia | Polygonaceae > subfam. Polygonoideae > Polygonum > sect. Duravia |
Sibling taxa | ||
Synonyms | Duravia californica, P. greenei | |
Name authority | Greene: Bull. Torrey Bot. Club 8: 99. (1881) | Meisner: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 14: 100. (1856) |
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