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

Viola utchinensis Koidz.

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Critically Endangered (CR)) 

Common name: オキナワスミレ, 沖縄菫 [meaning: Okinawa viola] 

Description: Plants ca. 10-20cm tall. Flowers pale blue or white, flowering mainly in February to March. Evergreen. Perennial plants. 

Distributional Range: Native Asia-Temperate EASTERN ASIA: Japan [Okinawa: it grows it in the shore of the middle part of Okinawa Island]

Habitat: Seaside limestome rocks .  The habitat is extremely restrictive.   

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. Yokota, M. et al. 1988. Viola stoloniflora (Violaceae), a new species from the Ryukyus. Bot. Mag. (Tokyo) 101:5.