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Parts.— Anther, the enlarged and essential portion.

Filament, the stem holding the anther.

Pollen, the fertilizing powder found in the anther.

Kinds.—Sessile, anther without filament.

Sterile, filament without anther.

Connivent, converging.

Exserted, protruding out of corolla.

Included, entirely within the corolla.

Didẏnamous, four in number, two long and two short.

Tetradẏnanious, six in number, four long and two short.

Cohesion.—Syngenesious, united by their anthers.

Monodelphous, united by their filaments into one set.

Diadelphous, united into two sets.

Polyadelphous, united into many sets.

Adnation.—Hypógynous, borne on the receptacle.

Perígynous, borne on the calyx.

Epipétalous, borne on the corolla.

Alternate, with the lobes.

Opposite, in front of the lobes.

Epígynous, borne on the ovary at its summit.

Gynándrous, borne on the style (Orchid).