Polygonum austiniae

Greene

Bull. Calif. Acad. Sci. 1: 212. 1885.

Common names: Mrs. Austin’s knotweed
Endemic
Synonyms: Polygonum douglasii subsp. austiniae (Greene) E. Murray
Treatment appears in FNA Volume 5. Treatment on page 569. Mentioned on page 562, 568.

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.


Phenology: Flowering Jun–Sep.
Habitat: Dry to moist flats on banks, sagebrush plains, and ponderosa pine forests
Elevation: 1300-1600 m

Distribution

V5 1165-distribution-map.gif

Alta., B.C., Calif., Idaho, Mont., Nev., Oreg., Wash., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Polygonum austiniae"
Mihai Costea +, François J. Tardif +  and Harold R. Hinds† +
Greene +
Mrs. Austin’s knotweed +
Alta. +, B.C. +, Calif. +, Idaho +, Mont. +, Nev. +, Oreg. +, Wash. +  and Wyo. +
1300-1600 m +
Dry to moist flats on banks, sagebrush plains, and ponderosa pine forests +
Flowering Jun–Sep. +
Bull. Calif. Acad. Sci. +
Polygonum douglasii subsp. austiniae +
Polygonum austiniae +
Polygonum sect. Duravia +
species +