*Hedera Linnaeus. Common name: Ivy.
A genus of 15 species, lianas, distributed from Mediterranean Europe west to e. Asia (Plunkett et al. 2018b).
ID notes: The leaves of Hedera are dimorphic, sometimes confusing observers; "juvenile" leaves (those of the sterile branches) are about as wide as long and (in H. helix) palmately 3-5-lobed, those of the fertile branches (less commonly seen) are obovate or elliptic. Juvenile leaf lobing can sometimes be subtle (e.g. H. algeriensis).
References: Ackerfield & Wen (2002); Ballou et al. (2023); Frodin & Govaerts (2003); Graham (1966); Green, Ramsey, & Ramsey (2011); Stace (2010); Staff of the Bailey Hortorium (1976); Wen (2024f) In Flora of North America Editorial Committee (2024). Show full citations.
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