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Botany · Ch 4 — Reproductive Morphology

Plant sex

4.2.3

Plant sex

Plant sex describes how flowers of different sexes are distributed across the individual plants of a species, independent of any single flower's own sex. A hermaphroditic plant bears only bisexual flowers throughout. A monoecious plant (Greek: 'one house') bears separate unisexual male and female flowers, but both on the same individual plant, as in coconut. A dioecious plant (Greek: 'two houses') bears male flowers on one individual and female flowers on an entirely separate individual, as in papaya and Palmyra palm. A polygamous plant bears a mixture of bisexual and unisexual (staminate/pistillate) flowers on the same plant, as in banana (Musa) and mango (Mangifera); this condition is further subdivided by exactly which combination of flower types occurs and on how many individuals - andromonoecious (male + bisexual flowers on one plant), gynomonoecious (female + bisexual on one plant), polygamomonoecious/trimonoecious (male + female + bisexual all on one plant), androdioecious (male flowers on one individual, bisexual on another), gynodioecious (female flowers on one individual, bisexual on anoth …

Figure 4.12Monoecious, Dioecious and Polygamous plants

What this figure shows. (a) A monoecious plant (coconut) shown bearing both a separate male flower and a separate female flower on the same individual plant. (b) A dioecious pair (papaya-type) shown as two separate individual plants, one bearing only male flowers and the other bearing only female flowers. (c) A polygamous plant shown bearing a mix of bisexual flowers alongside unisexual (male or female) flowers on …