The flowers are generally regular, or symmetrical. They are hermaphroditic, actinomorphic (radially symmetrical, like in "Geranium") or slightly zygomorphic (with a bilateral symmetry, like in "Pelargonium"). The calyx and the corolla are both pentamerous (with five lobes), petals are free while sepals are connate or united at the base. The androecium consists in two whorls of five stamens each, some of which can be unfertile; the pistil consists of five (less commonly three) merged carpels. The linear stigmas are free, and the ovary is superior. The nectaries are localised at the bases of the antesepalous stamens and are formed by the receptacle. "Pelargonium" has only one nectary gland on the adaxial side of the flower. It is hidden in a tube-like cavity which is formed by the receptacle. Flower morphology is conserved within Geraniaceae, but there is a large diversity in floral architecture. Flowers are usually grouped in cymes (e.g. in "Geranium"), umbels (e.g. in "Pelargonium") or, more rarely, spikes.