Search results
Results From The WOW.Com Content Network
In plants with bisexual flowers, the anthers and carpels may mature at different times, plants being protandrous (with the anthers maturing first) or protogynous (with the carpels mature first). [citation needed] Monoecious species, with unisexual flowers on the same plant, may produce male and female flowers at different times. [citation needed]
It is a monomorphic sexual system comparable with gynomonoecy, andromonoecy and trimonoecy, and contrasted with dioecy where individual plants produce cones or flowers of only one sex and with bisexual or hermaphroditic plants in which male and female gametes are produced in the same flower.
One example is that male flowers are often larger than female flowers, at least in some species. Although this is presumably achieved through resource allocation mechanisms, it is unlikely that resource allocation from lower cost of androecium than gynoecium leading to higher expenditure on corolla in males, is a general and complete ...
In angiosperms unisexual flowers evolve from bisexual ones. [32] Dioecy occurs in almost half of plant families, but only in a minority of genera, suggesting recent evolution. [ 33 ] For 160 families that have dioecious species, dioecy is thought to have evolved more than 100 times.
These flowers are described by botanists as being perfect, bisexual, or hermaphrodite. In some species of plants, the flowers are imperfect or unisexual: having only either male (stamen) or female (carpel) parts. If unisexual male and female flowers appear on the same plant, the species is called monoecious.
Evergreen trees with tiny bisexual or unisexual flowers [75] ... Unisexual and bisexual shrubs and small trees, with a few vines [199] Crossosomatales:
Where both bisexual and unisexual flowers exist on the same plant, it is called polygamous. Polygamous plants may have bisexual and staminate flowers (andromonoecious), bisexual and pistillate flowers (gynomonoecious), or both (trimonoecious). Other combinations include the presence of bisexual flowers on some individual plants and staminate on ...
The flowers are often unisexual. Many species are monoecious or have mixed inflorescences of bisexual and unisexual flowers. Some species are dioecious, like Spinacia, Grayia, Exomis microphylla, and Atriplex. In several species of tribe Atripliceae, the female flowers are without perianth, but enclosed by two bracts.