kingdom Plantae - plants »  divisio Magnoliophyta - flowering plants »  class Rosopsida - eudicots » order Malpighiales »  family Violaceae »  tribus Violeae > genus Viola > Viola sect. Melanium  Ging. 

Viola gracilis Sm. 

Synon.: Viola calcarata Munby non L.; Viola calycina Boiss. & Heldr.; Viola cornuta Desf. non L.; Viola elongata A.Huet ex Nyman; Viola olimpia Beggiat.; Viola olympica Boiss.; Viola valderia Rchb.

BioLib  GRIN 

Distributional Range: Native Asia-Temperate WESTERN ASIA: Turkey Europe SOUTHEASTERN EUROPE: Albania, Bulgaria, Former Yugoslavia.

Morphology and biology. Perennial herbaceous plant. Stems numerous, up to 25 cm high, ascending or erect, hispid. Leaves rounded, broadly ovate, ovate or elongate-elliptical, dentate, on the veins and along the edges hairy or rarely glabrous throughout, with palmate or pinnatifid stipules. Flowers single in the leaf axils, with long peduncles. Side and upper petals yellow or blue violet, lower petal yellow, blue violet or pale violet, yellowish orange at the base, with 5–7 darker veins and 6–10 mm long spur. 

Habitats and populations. Dry, grassy and stony places. Occurs usually individually, but in some places large groups are found with a good number of individuals and a high density.  1250 - 2100 m 

References:

1. Davis, P. H., ed. 1965-1988. Flora of Turkey and the east Aegean islands. Note: lists as Viola gracilis Sibth. & Sm.

2. Encke, F. et al. 1984. Zander: Handwörterbuch der Pflanzennamen, 13. Auflage

3. Huxley, A., ed. 1992. The new Royal Horticultural Society dictionary of gardening Note: lists as Viola gracilis Sibth. & Sm.

4. Liberty Hyde Bailey Hortorium. 1976. Hortus third. Note: lists as Viola gracilis Sibth. & Sm.

5. Tutin, T. G. et al., eds. 1964-1980. Flora europaea. Note: lists as Viola gracilis Sibth. & Sm.