Cell cycle arrest characterizes the transition from a bisexual floral bud to a unisexual flower
in Phoenix dactylifera.
Deceitful pollination by anther-mimicking stigma had been known earlier only in cases of species with unisexual flowers
Developmental analyses reveal early arrests of the spore-bearing parts of reproductive organs in unisexual flowers
of cucumber (Cucumis sativus L.
americanus, has been described as having dioecious, unisexual flowers
with either stamens or gynoecium aborting (Green 1958; Nesom 2012).
1990) and the occurrence of unisexual flowers
in certain species almost restricted to Theligoneae and Anthospermae (Robbrecht, 1988).
The individual unisexual flowers
lack a perianth, the pistillate flower consisting of 1 (rarely 2) pistil(s) subtended by a scale, and the staminate flower consisting of 1-3 stamens borne in a scale.
Historically, the designation "male" and "female" parts have often been applied to the stamens and carpels, respectively, and thus with unisexual flowers
one might see reference to the male or female flower.
Different flower sexes and breeding systems have been reported for Bromeliaceae (Table 1) ranging from bisexual flowers to unisexual flowers
and from xenogamy to cleistogmy.
Organ initiation and the development of unisexual flowers
in the tassel and ear of Zea mays.
Monoecious A plant having unisexual flowers
(staminate and pistillate) on the same plant.
Differential floral rewards and pollination by deceit in unisexual flowers
Deviations from this common pattern include spatial segregation of the sexes into different unisexual flowers
on the same plant (monoecy), unisexual flowers
on different plants (dioecy), or intermediate combinations including gynodioecy, where female and hermaphroditic plants occur in populations.