Canadian juniper
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Canadian juniper ( Juniperus communis var. Depressa ) |
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| Juniperus communis var. Depressa | ||||||||||||
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The Canadian juniper ( Juniperus communis var. Depressa ) is a variety of the commons juniper ( Junipuers communis ) from the family of cypress plants (Cupressaceae). It is native to much of North America.
description
The Canadian juniper usually grows as an evergreen , multi-stemmed, prostrate shrub, more rarely as a small tree. The shrub shape reaches heights of growth of up to 3 meters, the trees are up to 6, in exceptional cases up to 10 meters high. The fibrous bark flakes off in thin strips and is initially brown, but turns gray over time. The branches go straight or ascending from the trunk.
The needle-shaped leaves are 0.8 to 1.5 centimeters long and have a pointed or pointed tip. They have blue-green stomatal ligaments .
The Canadian juniper is dioecious ( dioecious ). The female berry cones are 0.6 to 0.9 centimeters thick. Each of the cones bears three seeds.
The number of chromosomes is 2n = 22.
Distribution and location
The natural range of the Canadian juniper is in Canada and large parts of the USA. In Canada, the species is found in all provinces and territories. In the USA the distribution area reaches the northernmost point in Alaska and the southernmost point in California , Arizona and New Mexico . It also extends from the west to the east coast. Fossil remains of the species from the cold period known in North America as the Wisconsin glaciation have been found in the southern Appalachian Mountains .
The Canadian juniper thrives at altitudes from 0 to 2800 meters. It grows there on rocky soils on slopes and on mountain peaks.
Systematics
It was first described as Juniperus communis var. Depressa in 1814 by Frederick Traugott Pursh in Flora Americae Septentrionalis; or, a Systematic Arrangement and Description of the Plants of North America , Volume 2, pages 646-647. Synonyms for Juniperus communis var. Depressa Pursh are Juniperus communis subsp. depressa (Pursh) Franco and Juniperus depressa (Pursh) Raf.
swell
- Christopher J. Earle: Juniperus communis var. Depressa. In: The Gymnosperm Database. www.conifers.org, November 23, 2012, accessed on March 24, 2013 .
- Frank D. Watson, James E. Eckenwalder: Cupressaceae . Juniperus . In: Flora of North America Editorial Committee (Ed.): Flora of North America North of Mexico . Pteridophytes and Gymnosperms. Volume 2. Oxford University Press, New York a. a. 1993, ISBN 0-19-508242-7 , Juniperus communis var. Depressa (English, Juniperus communis var. Depressa - online - this work is online with the same text).
Individual evidence
- ↑ a b c d e Christopher J. Earle: Juniperus communis var. Depressa. In: The Gymnosperm Database. www.conifers.org, November 23, 2012, accessed on March 24, 2013 .
- ^ Frank D. Watson, James E. Eckenwalder: Cupressaceae . Juniperus . In: Flora of North America Editorial Committee (Ed.): Flora of North America North of Mexico . Pteridophytes and Gymnosperms. Volume 2. Oxford University Press, New York a. a. 1993, ISBN 0-19-508242-7 , Juniperus communis var. Depressa (English, Juniperus communis var. Depressa - online - this work is online with the same text).
- ↑ Juniperus communis var. Depressa at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed March 24, 2013.
