Notes on New World Zingiberaceae
Acta botanica neerlandica , Volume 24 - Issue 5/6 p. 469- 480
12 New species of Costus and 22 new species of Renealmia are described and various new combinations are made. All these species will be more intensively dealt with by the author in his forthcoming treatment of the genera Renealmia and Costas for Flora Neotropica (to be published in 1976).
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