Ivy Oil


Ivy Oil - Directory & Reference Resources

Ivy-From Wikipedia, the free encyclopedia

For other uses, see Ivy (disambiguation). "Hedera" redirects here. In typography, it is the name of a horticultural dingbat shaped like an ivy leaf.

Hedera

Hedera hibernica shoot with flower buds

Scientific classification

Kingdom: Plantae

Division: Magnoliophyta

Class: Magnoliopsida

Order: Apiales

Family: Araliaceae

Subfamily: Aralioideae

Genus: Hedera

L.

Species

Hedera algeriensis – Algerian Ivy

Hedera azorica – Azores Ivy

Hedera canariensis – Canaries Ivy

Hedera caucasigena

Hedera colchica – Caucasian Ivy

Hedera cypria

Hedera helix – Common Ivy

Hedera hibernica – Irish Ivy

Hedera maderensis – Madeiran Ivy

Hedera maroccana

Hedera nepalensis – Himalayan Ivy

Hedera pastuchowii – Pastuchov's Ivy

Hedera rhombea – Japanese Ivy

Hedera sinensis

Hedera taurica

Hedera (English name ivy, plural ivies) is a genus of 15 species of climbing or ground-creeping evergreen woody plants in the family Araliaceae, native to the Atlantic Islands, western, central and southern Europe, northwestern Africa and across central-southern Asia east to Japan. On suitable surfaces (trees and rock faces), they are able to climb to at least 25–30 metres above the basal ground level.

They have two leaf types, with palmately lobed juvenile leaves on creeping and climbing stems, and unlobed cordate adult leaves on fertile flowering stems exposed to full sun, usually high in the crowns of trees or the top of rock faces. The juvenile and adult shoots also differ, the former being slender, flexible and scrambling or climbing with small roots to affix the shoot to the substrate (rock or tree bark), the latter thicker, self-supporting, and without roots. The flowers are produced in late autumn, individually small, in 3–5 cm diameter umbels, greenish-yellow, and very rich in nectar, an important late food source for bees and other insects; the fruit are small black berries ripening in late winter, and are an important food for many birds, though poisonous to humans. The seeds are dispersed by birds eating the fruit. The leaves are eaten by the larvae of some species of Lepidoptera such as Angle Shades, Lesser Broad-bordered Yellow Underwing, Scalloped Hazel, Small Angle Shades, Small Dusty Wave (which feeds exclusively on ivy), Swallow-tailed Moth and Willow Beauty.

Contents

1 Taxonomic note

2 Uses and cultivation

3 See also

4 References

5 Gallery

 Taxonomic note

The species are largely allopatric and closely related, and all 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.

 Uses and cultivation

Ivies are very popular in cultivation within their native range, both for attracting wildlife, and for their evergreen foliage; many cultivars with variegated foliage and/or unusual leaf shape have been selected. They are particularly valuable for covering unsightly walls. Ivies have however proved to be a serious invasive weed in the parts of North America where winters are not severe, and their cultivation there is now discouraged in many areas. Similar problems exist in Australia where the plant was originally cultivated in gardens.

Much has been argued as to whether ivy climbing trees will harm the tree or not; the consensus in Europe is that they do not harm trees significantly, though they may compete for ground nutrients and water to a small extent, and trees with a heavy growth of ivy can be more liable to windthrow. Problems are greater in North America, where trees may be overwhelmed by the ivy to the extent they are killed; this could be because ivy in North America, being introduced, is without the natural pests and diseases that control its vigour in its native areas. A more serious problem is that ivy creates a vigorous, dense, shade-tolerant evergreen groundcover (precisely the characteristics for which it is often cultivated) that can spread over large areas and outcompete native vegetation.

Similar concerns are expressed about damage to walls. It is generally considered that a soundly mortared wall is impenetrable to the climbing roots of ivy and will not be damaged, and is also protected from further weathering by the ivy keeping rain off the mortar. Walls with already weak or loose mortar may however be badly damaged, as the ivy is able to root into the weak mortar and further break up the wall. Subsequent removal of the ivy can be difficult, and is likely to cause more damage than the ivy itself. Modern mortars that contain portland cement and little lime are stronger than older mortar mixes that were largely composed of just sand and lime. Most mortar mixes changed to contain portland cement in the 1930s. Soft mortar is still used when laying softer brick.

Regional English names for ivy include Bindwood and Lovestone (for the way it clings and grows over stones and brickwork).

 See also

Poison ivy - unrelated to this genus

 References

McAllister, H. (1982). New work on ivies. Int. Dendrol. Soc. Yearbook 1981: 106-109.

 Gallery

Hedera helix leaves

Hedera helix berries

Hedera colchica flowers

Hedera colchica foliage

Variegated Ivy

Tempelherrenhaus Weimar

Wikimedia Commons has media related to:

HederaLook up ivy in Wiktionary, the free dictionary.Retrieved from "http://en.wikipedia.org/wiki/Ivy"

Categories: Araliaceae | Garden plants

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