Juniperus horizontalis
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| Foliage and cones | |
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| Scientific classification Edit this classification | |
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| Binomial name | |
| Template:Taxon infoTemplate:Taxon italics Moench 1794
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| Natural range of Juniperus horizontalis | |
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| Synonyms[1] | |
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Juniperus horizontalis, the creeping juniper or creeping cedar,[4] is a low-growing shrubby juniper native to northern North America, throughout most of Canada from Yukon east to Newfoundland, and in some of the northern United States.
Description
Living up to both its scientific and common names, the species reaches only Page Template:Fraction/styles.css has no content.10–30 centimetres (3+7⁄8–11+3⁄4 in) tall but often spreading several metres wide. The shoots are slender, Page Template:Fraction/styles.css has no content.0.7–1.2 millimetres (1⁄32–1⁄16 in) diameter. The leaves are arranged in opposite decussate pairs, or occasionally in whorls of three; the adult leaf blades are scale-like, 1–2 mm long (to 8 mm on lead shoots) and Page Template:Fraction/styles.css has no content.1–1.5 mm (1⁄32–1⁄16 in) broad, and derive from an adnate petiole. The juvenile leaves (on young seedlings only) are needle-like, Page Template:Fraction/styles.css has no content.5–10 mm (3⁄16–3⁄8 in) long. The cones are berry-like, globose to bilobed, Page Template:Fraction/styles.css has no content.5–7 mm (3⁄16–9⁄32 in) in diameter, dark blue with a pale blue-white waxy bloom, and contain two seeds (rarely one or three); they usually have a curved stem and are mature in about 18 months. The male cones are Page Template:Fraction/styles.css has no content.2–4 mm (3⁄32–5⁄32 in) long, and shed their pollen in early spring. It is dioecious, producing cones of only one sex on each plant.
It is closely related to Juniperus virginiana, and often hybridizes with it where their ranges meet in southern Canada. Hybrids with Juniperus scopulorum also occur.
Distribution and habitat
The species is native to northern North America, throughout most of Canada from Yukon east to Newfoundland, and in the United States in Alaska, and continentally from Montana east to Maine, reaching its furthest south in Wyoming and northern Illinois. Amongst the sites it occupies are rocky areas of the east slopes of the Rocky Mountains.[5]
Cultivation and uses
Well over 100 different cultivars have been selected for use as ornamental plants in gardens, their strictly prostrate growth habit being valued for ground cover. Popular examples include 'Bar Harbor', 'Blue Acres', 'Emerald Spreader', 'Green Acres', and 'Wiltonii' ("Blue Rug Juniper"). Many of the most popular cultivars have strikingly glaucous foliage, while others are bright green, yellowish or variegated.
Gallery
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Plant at Pancake Bay sand dunes, Ontario, Canada
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Juniperus horizontalis 'Wiltonii' as a garden plant
References
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- ^ Juniperus horizontalis The Plant List (2010). Version 1. Published on the Internet; http://www.theplantlist.org/ 22 Nov. 2011
- ^ Template:Cite iucn
- ^ Page Module:Citation/CS1/styles.css has no content.NatureServe (2024). "Juniperus horizontalis". Arlington, Virginia. Retrieved 18 August 2024.
- ^ Bailey, L.H.; Bailey, E.Z.; the staff of the Liberty Hyde Bailey Hortorium. 1976. Hortus third: A concise dictionary of plants cultivated in the United States and Canada. Macmillan, New York.
- ^ Page Module:Citation/CS1/styles.css has no content.Arno, Stephen F.; Hammerly, Ramona P. (2020) [1977]. Northwest Trees: Identifying & Understanding the Region's Native Trees (field guide ed.). Seattle: Mountaineers Books. p. 174. ISBN 978-1-68051-329-5. OCLC 1141235469.
Further reading
- Adams, R. P. (2004). Junipers of the World: The genus Juniperus. Trafford Publishing Template:ISBN
External links
- USDA Plants Profile for Juniperus horizontalis (creeping juniper)
- Gymnosperm Database: Juniperus horizontalis Script error: No such module "webarchive".
- Flora of North America: Juniperus horizontalis
- Plantmaps.com: Interactive Distribution Map of Juniperus horizontalis Script error: No such module "webarchive".
- Lady Bird Johnson Wildflower Center, NPIN Database: Juniperus horizontalis (Creeping juniper, Creeping savin)
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