UW Burke Herbarium species comparison

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Polygonum parryi

Polygonum sawatchense

Parry's knotweed, prickly knotweed

Polygonum parryi

Polygonum sawatchense
Flowering time June-July June-August
Habitat Vernal pools, seasonally damp ground at low elevations. Dry to moist forest openings and meadows from moderate elevations to the subalpine.
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 the Great Plains.
[WildflowerSearch map]
[BONAP county map]
Origin Native Native
Conservation status Threatened in Washington (WANHP) Not of concern
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. austiniae, 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. spergulariiforme
Subordinate taxa
P. sawatchense ssp. oblivium, P. sawatchense ssp. sawatchense
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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