Polygonum parryi |
Polygonum austiniae |
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Parry's knotweed, Parry's or prickly knotweed, prickly knotweed |
Austin's knotweed, Mrs. Austin's knotweed, Rebecca Austin'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. |
ascending to erect, green to purplish, much-branched from base, not wiry, 5–10(–20) 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, articulated to ocreae, basal leaves persistent, distal leaves abruptly reduced to bracts, articulated to ocreae; ocrea 3–5 mm, papillose-scabridulous or glabrous, proximal part funnelform, distal part lacerate; petiole 0.1–2 mm; blade 1-veined, not pleated, ovate to elliptic or obovate, 5–15 × 4–7 mm, margins flat or narrowly revolute, papillose-denticulate, apex acute or mucronate. |
Inflorescences | axillary; cymes in most axils, 1-flowered. |
axillary and terminal, spikelike, slender; cymes spaced along branches, 1–4-flowered. |
Pedicels | absent. |
exserted from ocreae, reflexed, 1–2.5 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. |
closed; perianth (1.8–)2–2.6 mm; tube 20–28% of perianth length; tepals overlapping, green or purple, with narrow whitish margins, petaloid or sepaloid, oblong, cucullate, navicular, apex rounded; 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, black, elliptic to obovate, 2–2.5 mm, faces subequal, shiny, ± smooth. |
Polygonum parryi |
Polygonum austiniae |
|
Phenology | Flowering May–July. | Flowering Jun–Sep. |
Habitat | Vernally moist, open, sandy or rocky places | Dry to moist flats on banks, sagebrush plains, and ponderosa pine forests |
Elevation | 500-2000 m (1600-6600 ft) | 1300-1600 m (4300-5200 ft) |
Distribution |
CA; WA
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CA; ID; MT; NV; OR; WA; WY; AB; BC
|
Source | FNA vol. 5, p. 563. | FNA vol. 5, p. 569. |
Parent taxa | Polygonaceae > subfam. Polygonoideae > Polygonum > sect. Duravia | Polygonaceae > subfam. Polygonoideae > Polygonum > sect. Duravia |
Sibling taxa | ||
Synonyms | P. douglasii subsp. austiniae | |
Name authority | Greene: Bull. Torrey Bot. Club 8: 99. (1881) | Greene: Bull. Calif. Acad. Sci. 1: 212. (1885) |
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