Ivy, a genus of plants belonging to the pentandria clasf; and in the natural method giving name to the 46th order, Hederaceae. See BOTANY Index.

HEDERACEÆ (from hedera, "ivy"), the name of the 46th order in Linnaeus's fragments of a natural method, consisting of ivy, and a few other genera, which from their general habit and appearance seem nearly allied to it. See BOTANY Index.