Polygonum sawatchense


Bull. Torrey Bot. Club 20: 213, plate 156. 1893.

Treatment appears in FNA Volume 5. Treatment on page 568. Mentioned on page 561, 562.
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Herbs. Stems erect, green to brownish, simple or branched from base, not wiry, 4–50 cm, glabrous or papillose-scabrid-ulous. Leaves uniformly distributed, articulated to ocreae, basal leaves persistent or caducous, distal leaves abruptly or gradually reduced to bracts; ocrea 4–10 mm, glabrous or papillose-scabridulous, proximal part cylindric, distal part lacerate or disintegrating into a few persistent fibers; petiole 0.1–2 mm; blade 1-veined, not pleated, linear or narrowly oblong to oblanceolate, 8–45 × 2–8(–12) mm, margins revolute or flat, smooth or papillose-denticulate, apex acute, mucronate, rarely obtuse. Inflorescences axillary or axillary and terminal, spikelike, elongate; cymes widely spaced along branches, 2–4-flowered. Pedicels enclosed in or exserted from ocreae, erect, 1–4 mm. Flowers closed or at least some open; perianth (2.5–)4 mm; tube 20–40% of perianth length; tepals overlapping, greenish or reddish, sometimes flushed with purple, with white or pink margins, sepaloid or petaloid, oblong or oblong-elliptic, cucullate, navicular, apex rounded; midveins unbranched or with few branches at base; stamens 3–8. Achenes enclosed in perianth, black, elliptic or ovate, 2.5–3.3 mm, faces subequal, shiny, smooth.


V5 1161-distribution-map.gif

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


Subspecies 2 (2 in the flora).

Selected References



1 Stems and ocreae glabrous; leaf blades linear-lanceolate to narrowly oblong or oblanceolate, margins smooth; flowers closed Polygonum sawatchense subsp. sawatchense
1 Stems and ocreae papillose-scabridulous; leaf blades elliptic or oblong-elliptic, margins papillose-denticulate; at least some flowers open Polygonum sawatchense subsp. oblivium
... more about "Polygonum sawatchense"
Mihai Costea +, François J. Tardif +  and Harold R. Hinds† +
Alta. +, B.C. +, Sask. +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, N.Dak. +, N.Mex. +, Nebr. +, Nev. +, Oreg. +, S.Dak. +, Utah +, Wash. +  and Wyo. +
Bull. Torrey Bot. Club +
Undefined sect. Duravia +  and Polygonum sect. Monticola +
Polygonum sawatchense +
Polygonum sect. Duravia +
species +