Aspectos de la biología reproductiva de dos especies de chamaecrista moench (caesalpinioideae - leguminosae)

due to the scant knowledge about the reproductive biology of the genus chamaecrista (caesalpinioideae-leguminosae), the two herbaceous species ch. serpens and ch. nictitans subsp. patellaria var. paraguariensis were studied in order to produce basic information about their breeding and mating systems, considering the pollen/ovule ratio, floral biomass allocation to floral functions, atural efficiency in fruit and seed production and reproductive efficacy. the results show that both species are parcially self-compatible and partially autogamous. nevertheless, the high polen/ovule ratio and the biomass allocation mainly to attraction and male functions showed the necessity of the visit of pollinators, which seem to be quite effective in the studied populations due to the high natural efficiency in fruit and seed production and the high reproductive efficacy showed by both species.