kingdom Plantae - plants »  divisio Magnoliophyta - flowering plants »  class Rosopsida - eudicots » order Malpighiales »  family Violaceae »  tribus Violeae > genus Viola > Viola sect. Plagiostigma Godr.  > Viola subsect. Adnatae W. Becker 

Viola shikokiana Makino

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Common Name:  四国菫; シコクスミレ shikoku-sumire, hakone-sumire   

Synon.: 

Description: Perennial herb, 5-6 cm. Short rhizome giving rise to long, thin, white runners. which produce new feet at their ends. Elliptical leaves, acuminate apex, cordate base, protruding ribs. In April-May, white flowers Ø 8 mm, the lateral and lower petals are streaked with purple. Very short spur (2 mm), pocket-shaped.

Distributional Range:  Native Asia-Temperate EASTERN ASIA: Japan [Honshu, Kyushu, Shikoku]

Habitat: Broad leaved forest. 

References:

1. Igari, M. 1996. Wild violets of Japan Note: book almost entirely in Japanese

2. Iwatsuki, K. et al. 1993-. Flora of Japan.

3. Ohwi, J. 1965. Flora of Japan (Engl. ed.).