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Two morphological forms of Oropetium were collected from a single locality in India. One of them, O. thomaeum, is a known Indian native and is diploid (2n =18). The other is tetraploid (2n = 36). Their nuclear DNA amounts are in a simple 1:2 ratio and, together with morphological characters, suggest a close diploid/autotetraploid relationship between the two forms. The tetraploid is morphologically indistinguishable from O. minimum, which is native in East Tropical Africa and southern Arabia. It either constitutes a new record for O. minimum in India, or it is an autotetraploid O. thomaeum which resembles O. minimum because of morphological changes brought about by its polyploidy.
Kew Bulletin © 1995 Royal Botanic Gardens, Kew