Polygonum douglasii Greene
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Polygonaceae
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Scientific Name
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Description
Species Description - Slender annual, 2–6 dm, with numerous ascending branches; lvs linear-oblong to narrowly lanceolate, 2–5 cm × 2–8 mm, subulate-tipped, flat, often somewhat revolute; fls remote, only 1–3 per ocrea; pedicels 2–3 mm, exsert and soon reflexed; perianth 3–4 mm, cleft nearly to the base; achene black, shiny, 3–4 mm; 2n=40. Open, rocky or gravelly soil; Que. and n. N. Engl. to ne. Minn. and Io.; widespread in w. U.S.