Abstract
Abstract Male and female colonies are of equal frequency and of equal size in S. sericeus in New Zealand. This sex ratio is consistent with counts in other dioecious grasses including S. sericeus in Australia. Dioecism, its evolution and the a~sociated selection pressures, is discussed. Androdioecism which is described for several species S. considered relative to the strict dioecism of S. sericeus in New Zealand.
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