Polygonum douglasii ssp. austiniae

Polygonum douglasii subsp. austiniae (Greene) A.E. Murray:
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.

Polygonum douglasii var. austiniae (Greene) M.E. Jones:
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.

Polygonum austiniae Greene:
China (Asia)
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.

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

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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 obo-vate, 2-2.5 mm, faces subequal, shiny, ± smooth.

Polygonum douglasii Greene subsp. austiniae (Greene) E. Murray

There are many similar-appearing annual species of POLYGONUM. The typical P. DOUGLASII has leaves that are less than 1/3 as wide as they are long and achenes that are ca. 3 mm long. Many other species of POLYGONUM have erect flowers. A technical key and hand lens may be required for positive determination.

Dry to moist flats on banks, sagebrush plains, and ponderosa pine forests; 1300-1600m.

Flowering Jun-Sep.

Rounded Global Status Rank: T4 - Apparently Secure

Canada

Rounded National Status Rank: N2 - Imperiled

United States

Rounded National Status Rank: NNR - Unranked