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Abstract
Sarcocornia quinqueflora in New Zealand consists of populations of hermaphrodite plants except in Golden and Tasman Bays, at Foxton, and on the Otago Peninsula where the species is gynodioecious. Among Nelson populations the frequency offemale plants (F) ranged from 0.12 to 0.53; at Aramoana, Otago Harbour, females were not as frequent lying within the values 0.05 < F < 0.10. S. quinqueflora is protogynous and in the gynodioecious populations stigma exsertion from female flowers coincides with anther exsertion from hermaphrodite flowers. Gynodioecism is found in other Southern Hemisphere species of Sarcocornia; the possible evolutionary pathway to gynodioecism is outlined. Other reproductive systems found in the Salicornieae are discussed and related to the frequency of gynodioecism.
