Filament Ventral view Dorsal view Anther: Upper swollen part with microsporangia. Filament : Stalk of stamen Connective : Tissue connecting anther lobes with filament Anther typically contains two com partments called thecae (singular theca).Each theca consists of two microsporangia.Two microsporangia fused to form a locule. Sterile stamens are called Staminodes . Example: Cassia.
Distinct: stamens which do not fuse to one another. Free: stamens which do not fuse with other parts of flower. Apostemonous: flowers with stamens that are free and distinct. .
. Fusion of stamens: The fusion of stamens fusing among themselves or with other parts of flower. They are of two types. .
Connation and . Adnation . Connation : Refers to the fusion of stamens among themselves. It is of types.
a. Adelphy. b. Syngenecious.
c. Synandrous. a. Adelphy : Filaments connate into one or more bundles but anthers are free.
It may be the following types. . Monadelphous : Filaments of stamens connate into a single bundle.Example: Malvaceae (Chinarose, Cotton). D.
Quincuncial: It is a type of imbricate aestivation in which two petals are external and two internal and one petal with one margin internal and the other margin external. Example: Guava, Calyx of Ipomoea, Catharanthus. C. Imbricate: Sepals and petals irregularly overlap on each other; one member of the whorl is exterior, one interior and rest of the three having one margin exterior and other interior.
Example: Cassia, Delonix There are types: . Ascendingly imbricate; . Quincuncial; . Vexillary.
E. Vexillary: Large posterior petals both margins overlap lateral petals. Lateral petals other margin overlaps anterior petals. Example: Pea, Bean.
A. Valvate: Margins of sepals or petals do not overlap but just touch each other. Example: Calyx in members of Malvaceae, Calotropis, Annona. B.
Twisted or Convolute or Contorted: One margin of each petal or sepal overlapping on the other petal. Example: Petals of Chinarose. Aestivation: Arrangement of Sepals and Petals in the flower bud . Diadelphous : Filaments of stamens connate into two bundles.
Example: Fabaceae (pea) and Clitoria . . Polyadelphous : Filaments connate into many