|Hedera rhombea, Aizu, Fukushima pref., Japan|
Ivy, plural ivies (Hedera) is a genus of 12–15 species of evergreen climbing or ground-creeping woody plants in the family Araliaceae, native to western, central and southern Europe, Macaronesia, northwestern Africa and across central-southern Asia east to Japan and Taiwan.
- Trichomes scale-like
- Hedera algeriensis Hibberd – Algerian Ivy. Algeria, Tunisia (Mediterranean coast).
- Hedera canariensis Willd. – Canaries Ivy. Canary Islands.
- Hedera colchica (K.Koch) K.Koch – Persian Ivy. Alborz, Caucasus, Turkey.
- Hedera cypria McAllister – Cyprus Ivy (syn. H. pastuchovii subsp. cypria (McAll.) Hand). Cyprus (Troodos Mts.)
- Hedera iberica (McAllister) Ackerfield & J.Wen – Iberian Ivy. SW Iberian coasts.
- Hedera maderensis – Madeiran Ivy. Madeira.
- Hedera maroccana McAllister – Moroccan Ivy. Morocco.
- Hedera nepalensis K.Koch – Himalayan Ivy (syn. H. sinensis (Tobl.) Hand.-Mazz.). Himalaya, SW China.
- Hedera pastuchowii G.Woronow – Pastuchov's Ivy. Caucasus, Alborz.
- Hedera rhombea (Miq.) Siebold ex Bean – Japanese Ivy. Japan, Korea, Taiwan.
- Trichomes stellate
The species of ivy are largely allopatric and closely related, and many have on occasion been treated as varieties or subspecies of H. helix, the first species described. Several additional species have been described in the southern parts of the former Soviet Union, but are not regarded as distinct by most botanists.
The only verified hybrid involving ivies is the intergeneric hybrid × Fatshedera lizei, a cross between Fatsia japonica and Hedera hibernica. This hybrid was produced once in a garden in France in 1910 and never successfully repeated, the hybrid being maintained in cultivation by vegetative propagation. Despite the close relationship between Hedera helix and H. hibernica (until relatively recently considered conspecific), no hybrids between them have yet been found.
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- ↑ McAllister, H. (1982). New work on ivies Int. Dendrol. Soc. Yearbook 1981: 106–109.
- ↑ Germplasm Resources Information Network Species Records of Hedera
- ↑ Huxley, A., ed. (1992). New RHS Dictionary of Gardening 2: 60. Macmillan ISBN 0-333-47494-5.
- ↑ Metcalfe, D. J. (2005). Biological Flora of the British Isles no. 268 Hedera helix L. Journal of Ecology 93: 632–648.