The ontogeny of gender of Cupressus sempervirens L.

Cupressus sempervirens is sequentially monoecious. Young trees and new growth are female. Stressed trees are male or show a tendency toward male predominance. Female cone production starts in some plants during year 2 of growth, male cones are produced in some plants from year 4 on. Monoecy is completed at age 10. Young trees are pollinated only by adults, thus ensuring foreign pollination in the early years of reproduction. Unisexuality in the 1st years of reproduction reduces the reproductive effort. -from Authors