Geraniaceae Stock Video Footage


geraniaceae

Geraniaceae are herbs or subshrubs. The Sarcocaulon are succulent, but other members of the family generally are not. Leaves are usually lobed or otherwise divided, sometimes peltate, opposite or alternate and usually have stipules. The flowers are generally regular, or symmetrical. They are hermaphrodite, 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. Geraniaceae are normally pollinated by insects, but self-pollination is not uncommon. The fruit is a unique schizocarp made of five (or three) achenes, in the lower part the achenes are inside the calyx, while the upper part (the stylar beak) i...




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