According to the World Checklist of Selected Plant Families,, there are 17 species in the genus:
According to the World Checklist of Selected Plant Families, the genus contains the following species:
According to the World Checklist of Selected Plant Families, there are 28 species in the genus:
According to the World Checklist of Selected Plant Families, the genus contains 11 species and one interspecific hybrid.
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