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  1. Almond
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  149. Zucchini

 

 
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FRUITS AND VEGETABLES
This article is from:
http://en.wikipedia.org/wiki/Juniper

All text is available under the terms of the GNU Free Documentation License: http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License 

Juniper

From Wikipedia, the free encyclopedia

 
For other uses, see Juniper (disambiguation).

Junipers are coniferous plants in the genus Juniperus of the cypress family Cupressaceae. Depending on taxonomic viewpoint, there are between 50-67 species of juniper, widely distributed throughout the northern hemisphere, from the Arctic, south to tropical Africa in the Old World, and to the mountains of Central America in the New World.

Cones and leaves of Juniperus communis
Cones and leaves of Juniperus communis

Junipers vary in size and shape from tall trees, 20-40 m tall, to columnar or low spreading shrubs with long trailing branches. They are evergreen with either needle-like and/or scale-like leaves. They can be either monoecious or dioecious. The female seed cones are very distinctive, with fleshy, fruit-like coalescing scales which fuse together to form a "berry"-like structure, 4-27 mm long, with 1-12 unwinged, hard-shelled seeds. In some species these "berries" are red-brown or orange but in most they are blue; they are often aromatic (for their use as a spice, see juniper berry). The seed maturation time varies between species from 6-18 months after pollination. The male cones are similar to those of other Cupressaceae, with 6-20 scales; most shed their pollen in early spring, but some species pollinate in the autumn.
 

Detail of Juniperus chinensis shoots, with juvenile (needle-like) leaves (left), and adult scale leaves and immature male cones (right)
Detail of Juniperus chinensis shoots, with juvenile (needle-like) leaves (left), and adult scale leaves and immature male cones (right)

Many junipers (e.g. J. chinensis, J. virginiana) have two types of leaves: seedlings and some twigs of older trees have needle-like leaves 5-25 mm long; and the leaves on mature plants are (mostly) tiny (2-4 mm long), overlapping and scale-like. When juvenile foliage occurs on mature plants, it is most often found on shaded shoots, with adult foliage in full sunlight. Leaves on fast-growing 'whip' shoots are often intermediate between juvenile and adult.

In some species (e.g. J. communis, J. squamata), all the foliage is of the juvenile needle-like type, with no scale leaves. In some of these (e.g. J. communis), the needles are jointed at the base, in others (e.g. J. squamata), the needles merge smoothly with the stem, not jointed.

The needle-leaves of junipers are hard and sharp, making the juvenile foliage very prickly to handle. This can be a valuable identification feature in seedlings, as the otherwise very similar juvenile foliage of cypresses (Cupressus, Chamaecyparis) and other related genera is soft and not prickly.

Juniper is the exclusive food plant of the larvae of some Lepidoptera species including Bucculatrix inusitata and Juniper Carpet and is also eaten by the larvae of other Lepidoptera species such as Chionodes electella, Chionodes viduella, Juniper Pug and Pine Beauty.

Classification

The number of juniper species is disputed, with two recent studies giving very different totals, Farjon (2001) accepting 52 species, and Adams (2004) accepting 67 species. The junipers are divided into several sections, though (particularly among the scale-leaved species) which species belong to which sections is still far from clear, with research still on-going. The section Juniperus an obvious monophyletic group though.

  • Juniperus sect. Juniperus: Needle-leaf junipers. The adult leaves are needle-like, in whorls of three, and jointed at the base (see below right).
    • Juniperus sect. Juniperus subsect. Juniperus: Cones with 3 separate seeds; needles with one stomatal band.
      • Juniperus communis - Common Juniper
        • Juniperus communis subsp. alpina - Alpine Juniper
      • Juniperus conferta - Shore Juniper (syn. J. rigida var. conferta)
      • Juniperus rigida - Temple Juniper or Needle Juniper
    • Juniperus sect. Juniperus subsect. Oxycedrus: Cones with 3 separate seeds; needles with two stomatal bands.
      • Juniperus brevifolia - Azores Juniper
      • Juniperus cedrus - Canary Islands Juniper
      • Juniperus deltoides - Eastern Prickly Juniper
      • Juniperus formosana - Chinese Prickly Juniper
      • Juniperus luchuensis - Ryukyu Juniper
      • Juniperus navicularis - Portuguese Prickly Juniper
      • Juniperus oxycedrus - Western Prickly Juniper or Cade Juniper
      • Juniperus macrocarpa (J. oxycedrus subsp. macrocarpa) - Large-berry Juniper
    • Juniperus sect. Juniperus subsect. Caryocedrus: Cones with 3 seeds fused together; needles with two stomatal bands.
      • Juniperus drupacea - Syrian Juniper
Juniper needles, magnified. Left, Juniperus communis (Juniperus sect. Juniperus; note needles 'jointed' at base). Right, Juniperus chinensis (Juniperus sect. Sabina; note needles merging smoothly with the stem, not jointed at base).
Juniper needles, magnified. Left, Juniperus communis (Juniperus sect. Juniperus; note needles 'jointed' at base). Right, Juniperus chinensis (Juniperus sect. Sabina; note needles merging smoothly with the stem, not jointed at base).
Juniperus phoenicea on El Hierro, Canary Islands
Juniperus phoenicea on El Hierro, Canary Islands
An Eastern Juniper in October laden with ripe cones.
An Eastern Juniper in October laden with ripe cones.
  • Juniperus sect. Sabina: Scale-leaf junipers. The adult leaves are mostly scale-like, similar to those of Cupressus species, in opposite pairs or whorls of three, and the juvenile needle-like leaves are not jointed at the base (including in the few that have only needle-like leaves; see below right). Provisionally, all the other junipers are included here, though they form a paraphyletic group.
    • Old World species
      • Juniperus chinensis - Chinese Juniper
        • Juniperus chinensis var. sargentii - Sargent's Juniper
      • Juniperus convallium - Mekong Juniper
      • Juniperus excelsa - Greek Juniper
        • Juniperus excelsa subsp. polycarpos - Persian Juniper
      • Juniperus foetidissima - Stinking Juniper
      • Juniperus indica - Black Juniper
      • Juniperus komarovii - Komarov's Juniper
      • Juniperus phoenicea - Phoenicean Juniper
      • Juniperus procera - East African Juniper
      • Juniperus procumbens - Ibuki Juniper
      • Juniperus pseudosabina - Xinjiang Juniper
      • Juniperus recurva - Himalayan Juniper
        • Juniperus recurva var. coxii - Cox's Juniper
      • Juniperus sabina - Savin Juniper
        • Juniperus sabina var. davurica - Daurian Juniper
      • Juniperus saltuaria - Sichuan Juniper
      • Juniperus semiglobosa - Russian Juniper
      • Juniperus squamata - Flaky Juniper
      • Juniperus thurifera - Spanish Juniper
      • Juniperus tibetica - Tibetan Juniper
      • Juniperus wallichiana - Himalayan Black Juniper
    • New World species
      • Juniperus angosturana - Mexican One-seed Juniper
      • Juniperus ashei - Ashe Juniper
      • Juniperus barbadensis - West Indies Juniper
      • Juniperus bermudiana - Bermuda Juniper
      • Juniperus blancoi - Blanco's Juniper
      • Juniperus californica - California Juniper
      • Juniperus coahuilensis - Coahuila Juniper
      • Juniperus comitana - Comitán Juniper
      • Juniperus deppeana - Alligator Juniper
      • Juniperus durangensis - Durango Juniper
      • Juniperus flaccida - Mexican Weeping Juniper
      • Juniperus gamboana - Gamboa Juniper
      • Juniperus horizontalis - Creeping Juniper
      • Juniperus jaliscana - Jalisco Juniper
      • Juniperus monosperma - One-seed Juniper
      • Juniperus monticola - Mountain Juniper
      • Juniperus occidentalis - Western Juniper
        • Juniperus occidentalis subsp. australis - Sierra Juniper
      • Juniperus osteosperma - Utah Juniper
      • Juniperus pinchotii - Pinchot Juniper
      • Juniperus saltillensis - Saltillo Juniper
      • Juniperus scopulorum - Rocky Mountain Juniper
      • Juniperus standleyi - Standley's Juniper
      • Juniperus virginiana - Eastern Juniper
        • Juniperus virginiana subsp. silicicola - Southern Juniper

Cultivation and uses

Many of the earliest prehistoric people lived in or near juniper forests which furnished them food, fuel, and wood for shelter or utensils. Many species, such as J. chinensis (Chinese Juniper) from eastern Asia, are extensively used in landscaping and horticulture, and as one of the most popular species of bonsai. It is also a symbol of longevity.

Juniper berries are used in the distillation of gin and Jenever and the brewing of sahti. Juniper was also occasionally used in gruit, a mix of herbs used for flavouring beer prior to the use of hops.

The berries and needles are slightly poisonous and can cause irritation after ingestion or contact with the skin.

Some junipers are susceptible to Gymnosporangium rust disease, and can be a serious problem for those people growing apple trees, the alternate host of the disease.

Some junipers are sometimes misleadingly called cedars, correctly the vernacular name for species in the genus Cedrus, family Pinaceae.

References

  • Adams, R. P. (2004). Junipers of the World: The genus Juniperus. Trafford. ISBN 1-4120-4250-X
  • Farjon, A. (2001). World Checklist and Bibliography of Conifers. Kew. ISBN 1-84246-025-0
  • Farjon, A. (2005). Monograph of Cupressaceae and Sciadopitys. Royal Botanic Gardens, Kew. ISBN 1-84246-068-4
  • Junipers of the world
  • Gymnosperm Database - Juniperus
  • Arboretum de Villardebelle Photos of cones and foliage of selected species
Retrieved from "http://en.wikipedia.org/wiki/Juniper"