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A new species Cyanandrium osmanthum Nayar is described from Borneo with illustrations. Additional notes and illustrations have been given for the first time for the following species: C. guttatum Stapf, C. rufum Stapf, C. jacobsianum Nayar and C. glabrum Nayar. A key to the species so far known is also presented.
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M. P. Nayar (2024) studied this question.
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