Polygonum sawatchense subsp. sawatchense

Endemic
Synonyms: Polygonum douglasii subsp. johnstonii Polygonum douglasii var. johnstonii Munz Polygonum exile Coolidge Polygonum triandrum
Treatment appears in FNA Volume 5. Treatment on page 568.

Stems green to brownish, usually branched from base, 4–50 cm, glabrous. Leaves basal leaves caducous or persistent, distal leaves abruptly reduced to bracts, rarely much longer than flowers; ocrea glabrous; blade linear-lanceolate to narrowly oblong or oblanceolate, 15–45 × 2–8(–12) mm, margins usually revolute, smooth. Inflorescences axillary or axillary and terminal, long, open, racemes, 5–15 cm; cymes (1–)2–4-flowered. Pedicels 1–4 mm. Flowers closed; perianth (2.5–)3–3.5 mm; tube 25–40% of perianth length; tepals greenish or reddish with white or pink margins, oblong; midveins greenish or brown, unbranched or with few branches at base; stamens 3–8. Achenes ovate or elliptic, 2.5–3 mm.


Phenology: Flowering Jun–Aug.
Habitat: Dry meadows, pastures, sagebrush and forests on sandy, gravelly, or rocky substrates
Elevation: 800-3500 m

Distribution

V5 1162-distribution-map.gif

Alta., Sask., Ariz., Calif., Colo., Idaho, Mont., Nebr., Nev., N.Mex., N.Dak., S.Dak., Utah, Wash., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.
Mihai Costea +, François J. Tardif +  and Harold R. Hinds† +
Alta. +, Sask. +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, Nebr. +, Nev. +, N.Mex. +, N.Dak. +, S.Dak. +, Utah +, Wash. +  and Wyo. +
800-3500 m +
Dry meadows, pastures, sagebrush and forests on sandy, gravelly, or rocky substrates +
Flowering Jun–Aug. +
Bull. Torrey Bot. Club +
Polygonum douglasii subsp. johnstonii +, Polygonum douglasii var. johnstonii +, Polygonum exile +  and Polygonum triandrum +
Polygonum sawatchense subsp. sawatchense +
Polygonum sawatchense +
subspecies +