Polygonum polygaloides |
Polygonum austiniae |
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Austin's knotweed |
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Habit | Glabrous, erect or ascending, usually freely branched annual 6-20 cm. tall. | |
Leaves | Linear, 10-25 mm. long, 1-2 mm. broad, basally jointed; stipules lacerate, 4-8 mm. long. |
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Flowers | Crowded in groups of 1-4 on the branch tips, the branches arising from the axils of obovate, prominent, strongly white-margined bracts that have a green mid-rib; perianth 2.5 mm. long, divided over half the length, the 5 segments oblong-lanceolate, with greenish center and prominent white to pink margins. |
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Fruits | Achene with three sharp angles, dark brown, dull, longitudinally striate, 2 mm. long. |
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Polygonum polygaloides |
Polygonum austiniae |
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Identification notes | Achene 3-angled, black, smooth, shining, 2.5 mm. long, ovate in outline but tapered at both ends. | |
Flowering time | June-August | June-August |
Habitat | Meadows, vernal pools and rocky ridges, lowlands to mid-elevations in the mountains. | Dry to moist banks and flats, from sagebrush plains to lower mountains, often with ponderosa pine. |
Distribution | Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
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Occurring east of the Cascades crest in Washington; British Columbia to California, east to Alberta and Wyoming.
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Origin | Native | Native |
Conservation status | Not of concern | Threatened in Washington (WANHP) |
Sibling taxa | ||
Subordinate taxa | ||
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