E-Flora BC: Electronic Atlas of the Flora of British Columbia

Polygonum spergulariiforme Meisn. ex Small
spurry knotweed
Polygonaceae (Buckwheat family)

Introduction to Vascular Plants

© Dave Ingram  Email the photographer   (Photo ID #5420)

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Distribution of Polygonum spergulariiforme
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Species Information

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General:
Annual herb from a small taproot; stems ascending to erect, numerous, simple to freely branched, 10-40 cm tall.
Leaves:
Basal leaves lacking; stem leaves alternate, linear to narrowly oblong, egg-shaped or elliptic, the blades 1-8 cm long, unstalked or nearly so, sometimes reduced to bracts above; stipules short-sheathing, 5-12 mm long, clear, becoming ragged.
Flowers:
Inflorescence of few flowers in elongate axillary racemes; perianths 1.5-5 mm long, greenish with white or pinkish margins, 5-lobed nearly to the base.
Fruits:
Achenes, lanceolate to egg-shaped, sometimes 3-angled, black, smooth and shiny, 2-4 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to dry gravelly sites in the lowland and steppe zones; common on S Vancouver Island, the Gulf Islands and adjacent coast; S to ID, CO and CA.

Source: The Illustrated Flora of British Columbia

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Polygonum douglasii subsp. spergulariiforme (Meisn. ex Small) J.C. Hickman

Taxonomic and Nomenclatural Links

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Related Databases

General References