Variation in sex expression of Taxus brevifolia in western Oregon

Sex expression of Taxus brevifolia Nutt. was studied at four sites in western Oregon. Of 115 trees examined, 17 were cosexual. All cosexual trees had predominantly male sex expression, suggesting that male sterility is much more constant than female sterility for T. brevifolia. Some implications of the observed patterns are discussed, along with suggestions for further research.