UW Burke Herbarium species comparison

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Polygonum polygaloides

Polygonum polygaloides ssp. confertiflorum

close-flowered knotweed
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.

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.

Fruits

Achene with three sharp angles, dark brown, dull, longitudinally striate, 2 mm. long.

Polygonum polygaloides

Polygonum polygaloides ssp. confertiflorum
Flowering time June-August May July
Habitat Meadows, vernal pools and rocky ridges, lowlands to mid-elevations in the mountains. Meadows, vernal pools and dry open ground, lowlands to mid-elevations in the mountains
Distribution
Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
[WildflowerSearch map]
[BONAP county map]
Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Origin Native Native
Conservation status Not of concern 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. parryi, P. ramosissimum, P. sawatchense, P. spergulariiforme
P. polygaloides ssp. kelloggii, P. polygaloides ssp. polygaloides
Subordinate taxa
P. polygaloides ssp. confertiflorum, P. polygaloides ssp. kelloggii, P. polygaloides ssp. polygaloides
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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