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Annual or occasionally perennial herb from a taproot; stems prostrate, ascending or sometimes erect, several, usually 3-angled, at least when young, usually branched, the main branches 10-80 cm tall/long.
Basal leaves narrowly lanceolate to oblong-lanceolate, pale or bluish-green, the blades 5-15 mm long, unstalked, jointed at the base; stem leaves alternate, stem and branch leaves usually similar, reduced upwards; sheathing stipules silvery, 4-6 mm long, ragged.
Inflorescence of 1-5 flowers in axillary clusters; perianths 2-3 mm long, green with pink or white margins, 5-lobed more than 1/2 the distance to the base.
Achenes, with one side concave and two sides convex, brown, dull, pimply in lines,1.6-2.2 mm long.
Often mistaken for P. aviculare, a species having stem and branch leaves dissimilar.
Source: The Illustrated Flora of British Columbia