Common blue violet
Viola sororia Willd. [Violaceae]
Amerikasumiresaishin (アメリカスミレサイシン, 亜米利加菫細辛)
Lifeform: deciduous forb
Distribution: Native to eastern North America (extotic to Japan)
Habitat: sunny to semi-shaded sites, e.g., roadsides and meadows (Native habitats: moist to mesic black soil prairies, open woodlands, woodland edges, savannas, and wooded slopes along rivers or lakes)
Varieties
Many cultivars
Synonyms
V. palmata L. var. sororia (Willd.) Pollard
V. priceana Pollard
Viola sororia in Hokkaido
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[1/2] In May 24 2010 at a parking lot in N25/E2, East Ward, Sapporo. Flowers emerge directly from the rhizomes and form a basal rosette. [3/4] a white-flowered cultivar found at N27/W2 on May 26 2011. Probably escaped from a garden.