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Juniperus procera

(African Pencil Cedar)

Common Names

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Common Names in English:

African Juniper, African Pencil Cedar

Description

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Family Cupressaceae

Trees or shrubs evergreen , monoecious or dioecious. Leaves decussate or in whorls of 3, scalelike and then often dimorphic with flattened facial leaves and keeled lateral leaves, or needlelike particularly in juvenile plants , often with an abaxial resin gland . Pollen cones terminal or axillary , solitary, maturing and shed annually; microsporophylls 6-16, decussate or whorled , each bearing (2 or) 3-6(-9) pollen sacs ; pollen wingless. Seed cones usually terminal, solitary, globose , ovoid , or oblong , dehiscent or indehiscent when mature in 1st or 2nd(or 3rd) year; cone scales developing after ovules originate in bract axils; bracts almost completely enveloped by cone scales, free only at apex; ovules 1-numerous per bract axil, erect ; cone scales of mature cones 3-16, flat or peltate, woody, leathery, or succulent, 1-20-seeded. Seeds winged or not; wings derived from seed coat . Cotyledons usually 2, rarely 3-6. Germination epigeal.

Nineteen genera and ca. 125 species: worldwide; eight genera (one introduced ) and 46 species (16 endemic, 13 introduced) in China.[1]

Genus Juniperus

Shrubs or trees evergreen . Branchlets terete , 3--6 angled , variously oriented, but not in flattened sprays . Leaves opposite in 4 ranks or in whorls of 3. Adult leaves closely appressed to divergent, scalelike to subulate , free portion to ca. 10 mm (to ca. 15 mm in Juniperus communis ) ; abaxial gland visible or not, elongate to hemispheric ( J. ashei ), sometimes exuding white crystalline deposit. Pollen cones with 3--7 pairs or trios of sporophylls, each sporophyll with 2--8 pollen sacs . Seed cones maturing in 1 or 2 years, globose to ovoid and berrylike, 3--20 mm, remaining closed , usually glaucous; scales persistent , 1--3 pairs, peltate, tightly coalesced , thick and fleshy or fibrous to obscurely woody. Seeds 1--3 per scale, round to faceted , wingless; cotyledons 2--6. x = 11.

Species ca. 60: primarily Northern Hemisphere, 1 in e Africa.

Juniperus is the only dioecious (sometimes monoecious) genus of Cupressaceae in the flora . Cones, generally terminal , are axillary in J. communis.

Numerous cultivars of Juniperus species are widely used for landscaping. Mutants , or "sports," affecting plant habit and foliage are present in all species and are likely related to single-gene mutations . Many have been given formal names or incorrectly ascribed to hybridization. Gymnocarpy (bare seeds protruding from the cone), caused by insect larvae (T. A. Zanoni 1978), is occasionally found in most junipers, particularly in the southwestern United States. Specimens with such aberrations may be almost impossible to identify without chemical data.[2]

Physical Description

Habit: Evergreen .

Size/Age/Growth

Size: over 40' tall.

Habitat

Ecology: This large tree is found in mountainous areas on rocky ground , mostly between 1,750 and 2,500 m. [3]

Biology

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Growth

Culture: Space 20-30' apart.

Sunlight: Sun Exposure: Full Sun .

Moisture: Drought Tolerance: High

Temperature: Cold Hardiness: 8a, 8b, 9a, 9b, 10a, 10b, 11. (map)

Taxonomy

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Unambiguous Synonyms

  1. Juniperus abyssinica hort. ex K. Koch
  2. Juniperus hochstetteri Antoine
  3. Sabina procera (Hochst. Ex Endl.) Antoine

Notes

Name Status: Accepted Name . Latest taxonomic scrutiny: Farjon A., 11-Jan-2006

Similar Species

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Members of the genus Juniperus

ZipcodeZoo has pages for 913 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them:

J. abyssinica · J. alba · J. alpina · J. alvordensis · J. angosturana · J. arborea · J. argaea · J. argentea · J. arizonica · J. armstrongi · J. aromatica · J. ashei (Ashe´s Juniper) · J. attica · J. badia · J. barbadensis · J. barbadensis L. var. barbadensis · J. barbadensis var. barbadensis · J. barbadensis var. lucayana · J. bedfordiana · J. bermudiana (Bermuda Juniper) · J. biasoletti · J. blancoi · J. blancoi var. blancoi · J. blancoi var. mucronata · J. bregeoni · J. bregeonii · J. brevifolia · J. caesia · J. californica (California Juniper) · J. californica utahensis · J. californica var. osteosperma · J. californica var. siskiyouensis · J. californicus · J. canadensis · J. canescens · J. caucasica · J. cedrosiana · J. cedrus (Canary Islands Juniper) · J. cerrosianus · J. chinensis (Gold Tip Pfitzeriana Juniper) · J. chinensis 'Alba Recurva' · J. chinensis 'Ames' · J. chinensis L. 'Ames' (Chinese Juniper) · J. chinensis 'Armstrong' · J. chinensis 'Aurea' (Gold Coast Chinese Juniper) · J. chinensis 'Aureo-globosa' · J. chinensis L. 'Aureovariegata' · J. chinensis 'Bakaurea' (Gold Star® Juniper) · J. chinensis 'Belvedere' · J. chinensis L. 'Blaauws Varietat' · J. chinensis 'Blaauw' · J. chinensis L. 'Blauws' · J. chinensis 'Blue Alps' (Chinese Juniper) · J. chinensis 'Blue and Gold' · J. chinensis L. 'Blue Cloud' · J. chinensis 'Blue Point' (Blue Point Juniper) · J. chinensis 'Blue Vase' · J. chinensis L. var. chinensis · J. chinensis 'Columnaris' · J. chinensis 'Columnaris Glauca' · J. chinensis 'Compressa' (Chinese Juniper) · J. chinensis 'Daub' (Daub's Frosted Juniper) · J. chinensis 'Densa' · J. chinensis 'Densa Spartan' · J. chinensis L. 'Den Boer' · J. chinensis 'Dropmore' · J. chinensis 'Echiniformis' · J. chinensis L. 'Excelsior' · J. chinensis 'Expansa Aureospicata' · J. chinensis 'Expansa Variegata' · J. chinensis L. 'Fairview' · J. chinensis 'Fastigiata' · J. chinensis 'Femina' (Chinese Juniper) · J. chinensis 'Ferngold' · J. chinensis L. var. gaussenii (W.C.Cheng) Silba · J. chinensis globosa · J. chinensis 'Globosa Cinerea' · J. chinensis 'Golden Blaauw' (Chinese Juniper) · J. chinensis L. 'Golden Sovereign' · J. chinensis 'Gold Coast' (Chinese Juniper) · J. chinensis 'Gold Lace' · J. chinensis 'Gold Star' · J. chinensis 'Gold Tip' · J. chinensis 'Hetzii' · J. chinensis 'Hetzii Columnaris' (Hetzs Green Columnar Juniper) · J. chinensis 'Hetzii Glauca' (Hetz Chinese Juniper) · J. chinensis L. 'Hicksii' · J. chinensis holbert (Chinese Juniper) · J. chinensis 'Hook's #6' (Hook's #6 Juniper) · J. chinensis 'Iowa' · J. chinensis L. 'Jacobiniana' · J. chinensis L. 'Japonica Aurea' · J. chinensis 'Japonica Aureovariegata' · J. chinensis 'Japonica Variegata' · J. chinensis 'Kaizuka' (Chinese Juniper) · J. chinensis 'Kaizuka Variegata' (Variegated Hollywood Juniper) · J. chinensis 'Keteleeri' · J. chinensis L. 'Keteleerii' · J. chinensis 'Kuriwao Gold' · J. chinensis 'Kuriwao Sunbeam'

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal November 20, 2007:

Identifiers

Footnotes

  1. Liguo Fu, Yong-fu Yu, Robert P. Adams & Aljos Farjon "Cupressaceae". in Flora of China Vol. 4 Page 62. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  2. Robert P. Adams "Juniperus". in Flora of North America Vol. 2. Oxford University Press. Online at EFloras.org. [back]
  3. World Conservation Monitoring Centre 1998. In IUCN 2008. 2008 IUCN Red List of Threatened Species. IUCNRedList.org. Downloaded July 19, 2008. [back]
Last Revised: 7/2/2009