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General:
Annual herb from a rhizome; stems prostrate to erect, solitary from the rooted rhizome, few to numerous, 30-100 cm tall/long.
Leaves:
Basal leaves lacking; stem leaves alternate, lanceolate, mostly smooth, 5-10 cm long, short-stalked; stipules sparsely hairy, 10-15 mm long, sometimes fringed with bristly hairs at the tops.
Flowers:
Inflorescence of axillary and terminal, spikelike, interrupted racemes; perianths greenish with white margins, glandular-dotted, 5-lobed to about 1/2 the distance to the base; stamens usually 8.
Fruits:
Achenes, 2- to 3-angled, deep brownish-black to black, smooth, shiny.
Notes:
Closely related to P. hydropiper.
Source: The Illustrated Flora of British Columbia
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