| The related neotropical genera Cymbopetalum and Porcelia (Annonaceae), are revised on the basis of herbarium and field studies. Twenty-eight species are recognized in Cymbopetalum; 14 of them are described here as new: C. abacophyllum, C. aequale, C. amazonicum, C. coriaceum, C. duckei, C. fosteri, C. loretoyacuense, C. macrospermum, C. mathiasiae, C. oppositiflorum, C. parviflorum, C. pulchellum, C rugulosum, C. sanchezii, and C. schunkei. In addition, one new subspecies, C. hintonii subsp. septentrionale, is described. Studies of the floral biology of several species revealed numerous adaptations, both structural and physiological, to pollination by scarab beetles, primarily of the genus Cyclocephala. Fruit maturation and seed dispersal were observed in Cymbopetalum baillonii, which, like other species of Cymbopetalum, has a suite of characteristics that promote dispersal of its seeds by birds. Six species of Porcelia are recognized, one of them, P. discolor of Peru, described here as new. Porcelia exhibits a pollination syndrome analogous to that of Cymbopetalum; its seeds are adapted for dispersal by mammals. |
