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

Viola arsenica Beck 

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Distributional Range: Native Europe SOUTHEASTERN EUROPE: Macedonia (Allchar.)

Habitat: Viola arsenica is  one of the Macedonian endemic plants. It grows only in one place Allchar (Kozuf Mt,  K avadarci Municipality of North Macedonia). Very interesting about this plant is that the soil where Viola arsenica grow is very rich with arsenic 

References:

• Baceva K, Stafilov T, Matevski V.(2014) Bioaccumulation of heavy metals by endemic Viola species from the soil in the vicinity of the As-Sb-Tl mine "allchar' Republic of Macedonia. Int J Phytoremediation. 16(4):347-65.

• K. Bačeva, T. Stafilov, V. Matevski. (2014) Bioaccumulation of Heavy Metals by Endemic Viola Species from the Soil in the Vicinity of the As-Sb-Tl Mine “Allchar”, Republic of Macedonia. International Journal of Phytoremediation 16:4, pages 347-365.  

• Huxley, A., ed. 1992. The new Royal Horticultural Society dictionary of gardening

1. Tutin, T. G. et al., eds. 1964-1980. Flora europaea.