UW Burke Herbarium species comparison

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Polygonum parryi

Polygonum austiniae

Parry's knotweed, prickly knotweed

Austin's knotweed

Polygonum parryi

Polygonum austiniae
Identification notes Achene 3-angled, black, smooth, shining, 2.5 mm. long, ovate in outline but tapered at both ends.
Flowering time June-July June-August
Habitat Vernal pools, seasonally damp ground at low elevations. Dry to moist banks and flats, from sagebrush plains to lower mountains, often with ponderosa pine.
Distribution
Occurring in the east end of the Columbia River Gorge in Washington; south-central Washington to California.
[WildflowerSearch map]
[BONAP county map]
Occurring east of the Cascades crest in Washington; British Columbia to California, east to Alberta and Wyoming.
[WildflowerSearch map]
[BONAP county map]
Origin Native Native
Conservation status Threatened in Washington (WANHP) Threatened in Washington (WANHP)
Sibling taxa
P. achoreum, P. austiniae, P. aviculare, P. californicum, P. douglasii, P. erectum, P. fowleri, P. majus, P. minimum, P. nuttallii, P. paronychia, P. polygaloides, P. ramosissimum, P. sawatchense, P. spergulariiforme
P. achoreum, P. aviculare, P. californicum, P. douglasii, P. erectum, P. fowleri, P. majus, P. minimum, P. nuttallii, P. paronychia, P. parryi, P. polygaloides, P. ramosissimum, P. sawatchense, P. spergulariiforme
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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