Clarkella is a monotypic genus of flowering plants in the family Rubiaceae. The genus contains only one species, viz. Clarkella nana, which is native to India, China, Uttarakhand, the Western Himalayas, Burma and Thailand. References Rubioideae Flora of West Himalaya Flora of Myanmar Flora of Thailand Flora of China Environment of Uttarakhand Monotypic Rubiaceae genera