Polygonum austiniae |
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Austin's knotweed, Mrs. Austin's knotweed, Rebecca Austin's knotweed |
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Habit | Herbs. |
Stems | ascending to erect, green to purplish, much-branched from base, not wiry, 5–10(–20) cm, papillose-scabridulous. |
Leaves | 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 and terminal, spikelike, slender; cymes spaced along branches, 1–4-flowered. |
Pedicels | exserted from ocreae, reflexed, 1–2.5 mm. |
Flowers | 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 | enclosed in perianth, black, elliptic to obovate, 2–2.5 mm, faces subequal, shiny, ± smooth. |
Polygonum austiniae |
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Phenology | Flowering Jun–Sep. |
Habitat | Dry to moist flats on banks, sagebrush plains, and ponderosa pine forests |
Elevation | 1300-1600 m (4300-5200 ft) |
Distribution |
CA; ID; MT; NV; OR; WA; WY; AB; BC
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Source | FNA vol. 5, p. 569. |
Parent taxa | Polygonaceae > subfam. Polygonoideae > Polygonum > sect. Duravia |
Sibling taxa | |
Synonyms | P. douglasii subsp. austiniae |
Name authority | Greene: Bull. Calif. Acad. Sci. 1: 212. (1885) |
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