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The leaves are alternate, and generally coriaceous and shining; calyx gamosepalous and persistent, with three or six equal divisions; corolla with imbricated divisions.

The sepals are sometimes free or separate from each other, at other times they are united to a greater or less extent; in the former case, the calyx is polysepalous, in the latter gamosepalous or monosepalous.

The venation is useful as pointing out the number of leaves which constitute a gamosepalous calyx.

In a gamosepalous calyx the sepals are united in various ways, sometimes very slightly, and their number is marked by the divisions at the apex.

Gamosepalous, formed of united sepals, 89.