Abstract
Summary We report a study of the reproductive biology of the dioecious shrub Corema album in Galicia (N-W Spain). Male flowers were larger and heavier than female flowers, though the overall investment in sexual reproduction by females was higher. Population pollen-to-ovule ratio was very high (about 173 000:1). Flowering phenology was synchronous between males and females. The relative spatial distribution of the sexes appears to be random. Fruit set was not significantly dependent on either distance to the nearest male or sum of distances to the nearest five males. However, our results suggest that fruit set is higher in population nuclei with high population densities. Furthermore, mean single—fruit weight was higher in the population nucleus with highest fruit set than in the other nuclei studied.
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