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Protogynous: (of dichogamous plants) having female parts of flowers developed before male parts, e.g. having flowers that function first as female and then change to male or producing pollen after the stigmas of the same plant are receptive. [6] Subandroecious: having mostly male flowers, with a few female or bisexual flowers. [24]
Autoicous – produces male and female sex organs on the same plant but on separate inflorescences. Bract – leaf is present below the flower. Cladautoicous – male and female inflorescences are on separate branches of the same plant. Dioicous – having two forms of gametophyte, one form bearing antheridia and one form bearing archegonia.
The reproductive parts consist of both male and female parts (hermaphrodite). The androecium has six yellow-brown stamens that are free of the perianth and form two groups, each of about 5–8 mm (1 ⁄ 4 – 3 ⁄ 8 in), with filaments that are simple and flattened and oblong anthers that are 2–4 mm (1 ⁄ 16 – 3 ⁄ 16 in).
The gametophyte is the multicellular structure (plant) that is haploid, containing a single set of chromosomes in each cell. The gametophyte produces male or female gametes (or both), by a process of cell division, called mitosis. In vascular plants with separate gametophytes, female gametophytes are known as mega gametophytes (mega=large, they ...
The male reproductive structures of Polytrichum juniperinum. The sporophyte of Polytrichum juniperinum. It is a dioecious plant, meaning that the male and female gametophytes are on separate plants. Juniper haircap moss have very obvious male and female parts.
The oviducts of the female join to form a common duct (called the 'oviductus communis') which leads to the vagina. [3] [5] When copulation takes place, the male butterfly or moth places a capsule of sperm (referred to as 'spermatophore') in a receptacle of the female (called the 'corpus bursae').
The column, or technically the gynostemium, is a reproductive structure that can be found in several plant families: Aristolochiaceae, Orchidaceae, and Stylidiaceae. It is derived from the fusion of both male and female parts ( stamens and pistil ) into a single organ. [ 1 ]
Dioecy evolves due to male or female sterility, [30] although it is unlikely that mutations for male and female sterility occurred at the same time. [31] 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]