UW Burke Herbarium species comparison

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Polygonum achoreum

Polygonum fowleri

Blake's knotweed

Fowler's knotweed
Habit Very leafy annual or biennial, the stems prostrate or spreading, freely branched, 1-3 dm. long.
Leaves

Leaves alternate, usually overlapping, gradually reduced upward, the short petiole jointed;

leaf blades elliptic-linear to elliptic-oblanceolate, rounded, 1.5-3 cm. long and 3-10 mm. wide, firm;

stipules sheathing, lacerate, 3-6 mm. long.
Flowers

Flowers in closely packed, short, few-flowered, axillary racemes, exceeded by the bracts; pedicles 1-3 mm. long; the 5 perianth segments 3 mm. long, attached 1/3 their length, greenish with pink margins, oblong;

styles 3, very short.

Polygonum achoreum

Polygonum fowleri
Identification notes Achene 3-angled, lance-ovoid, olive green to yellowish-brown, smooth and shining.
Flowering time July-November
Habitat Coastal salt marshes.
Distribution
[WildflowerSearch map]
[BONAP county map]
Occurring west of the Cascades in Washington; Alaska south to California, east across northern Canada to northeastern North America.
[WildflowerSearch map]
[BONAP county map]
Origin Native Native
Conservation status Not of concern Not of concern
Sibling taxa
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. sawatchense, P. spergulariiforme
P. achoreum, P. austiniae, P. aviculare, P. californicum, P. douglasii, P. erectum, P. majus, P. minimum, P. nuttallii, P. paronychia, P. parryi, P. polygaloides, P. ramosissimum, P. sawatchense, P. spergulariiforme
Subordinate taxa
P. fowleri ssp. fowleri
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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