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Androsace
''Androsace'' is a genus in the family Primulaceae, second only to ''Primula'' in number of species. It is a predominantly Arctic–alpine genus with many species in the Himalayas (where the genus originated), the mountains of central Asia, the Caucasus, and the southern and central European mountain systems, particularly the Alps and the Pyrenees.
Plants of this genus are sometimes known as ''rock jasmines'' or ''fairy candelabras'' and are widely cultivated for their dense cushions covered in white or pink flowers. There are about 110 species.〔(Jepson Manual Treatment )〕〔(Flora of China )〕
==Taxonomy==
Recent molecular studies show that the genera ''Douglasia'' (found in north-western North America and easternmost Siberia), ''Pomatosace'' (an Himalayan endemic) and ''Vitaliana'' (a European endemic) are nested within ''Androsace''.〔〔Trift I., Anderberg A. A. and Källersjö M. 2002. The monophyly of ''Primula'' (Primulaceae) evaluated by analysis of sequences from the chloroplast gene rbcL. Systematic Botany 27(2):396-407〕 Phylogenetic studies have also demonstrated that the ancestor of ''Androsace'' first appeared about 35 Mya ago and was most probably an annual species. Evolution towards the denser morphology of cushions took place two times independently in Asia and in Europe.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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