selected vouchers: WTU
Notes: The taxonomy of Hedera is disputed, here we follow the taxonomy of Stace (1997). The subspecies are distinguished by the aspect and color of their stellate hairs, and to a lesser degree by the leaf lobing of sterile shoots. An abundant weed in western Washington (Murai 1999; Jacobson 2001). In the horticultural trade generally called CV 'Hibernica' or simply (and incorrectly) English ivy.