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Functional andromonoecy in Euphorbia
The presence of staminate cyathia in Euphorbia is revealed as a common phenomenon by Narbona et al. (pp. 571-577). These cyathia are more frequent at the first levels of the pleiochasia. Perennial species produce higher proportions of staminate cyathia than annuals. The selective forces causing this secondary sex segregation in Euphorbia are discussed.
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