Ivy, a genus of plants belonging to the pentandrae class; and in the natural method giving name to the 46th order, Hederaeae. 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.