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|image_caption=Tetraclinis articulata in the mountains of Cartagena, Spain
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[[File:Alhucemas (9).JPG|left|300px|thumb|Tetraclinis forest at [[Al Hoceima National Park]]]]
'''''Tetraclinis''''' is a [[genus]] of [[evergreen]] [[Pinophyta|coniferous]] [[tree]] in the [[Cupressaceae|cypress]] family [[Cupressaceae]], containing only one species, '''''Tetraclinis articulata''''', also known as '''Sandarac''' or the '''Barbary thuja'''<ref>http://books.google.com/books?id=fuwBN04nF9QC&pg=PA118&lpg=PA118&dq=barbary+thuja&source=bl&ots=8IHOTJDovW&sig=GA6vr4pZ2ehEYozmp8Pc2Xl9Yu0&hl=en&ei=CeWZSerfKJ6DtwfTl5CcCw&sa=X&oi=book_result&resnum=1&ct=result</ref>, [[endemism|endemic]] to the western [[Mediterranean region]]. It grows at relatively low altitudes in a hot, dry subtropical [[Mediterranean climate]].<ref name=farjon>Farjon, A. (2005). ''Monograph of Cupressaceae and Sciadopitys''. Royal Botanic Gardens, Kew. ISBN 1-84246-068-4</ref>
[[File:Alhucemas (11).JPG|left|300px|thumb|Tetraclinis cones at [[Al Hoceima National Park]]]]
It is a small, slow-growing tree, to 6–15 m (rarely 20 m) tall and 0.5 m (rarely 1 m) trunk diameter, often with two or more trunks from the base. The foliage forms in open sprays with scale-like [[leaf|leaves]] 1–8 mm long and 1–1.5 mm broad; the leaves are arranged in opposite decussate pairs, with the successive pairs closely then distantly spaced, so forming apparent whorls of four. The [[conifer cone|cones]] are 10–15 mm long, green ripening brown in about 8 months from pollination, and have four thick scales arranged in two opposite pairs. The [[seed]]s are 5–7 mm long and 2 mm broad, with a 3–4 mm broad papery wing on each side.<ref name=farjon/><ref name=rushforth>Rushforth, K. (1999). ''Trees of Britain and Europe''. Collins ISBN 0-00-220013-9.</ref>
It is one of only a small number of conifers able to [[coppice]] (re-grow by sprouting from stumps), an adaptation to survive [[wildfire]] and moderate levels of browsing by animals. Old trees that have sprouted repeatedly over a long period form large burrs at the base, known as ''lupias''.<ref name=farjon/>
The species has also been used in [[Bonsai]]. It is grown as an [[ornamental tree]], valued in hot, dry climates; it can be trimmed as a [[hedge (barrier)|hedge]].<ref name=rushforth/>
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Callitris quadrivalvis, Vent. (Thuja articulata, Vahl). Arab-tree. Sandarach. Gum Tree. Small tree, with fragrant hard durable wood: branches jointed and spreading: Ivs. very small, flattened, distichous, reduced to scales at the nodes: cone 4-sided, small, the valves oval and with a protuberance near the tip. N. Afr., in the mts. —Furnishes varnish resin (gum sandarach).
Callitris quadrivalvis, Vent. (Thuja articulata, Vahl). Arab-tree. Sandarach. Gum Tree. Small tree, with fragrant hard durable wood: branches jointed and spreading: Ivs. very small, flattened, distichous, reduced to scales at the nodes: cone 4-sided, small, the valves oval and with a protuberance near the tip. N. Afr., in the mts. L.B.C. 9:844.—Furnishes varnish resin (gum sandarach).
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Image:Araar-root-burl-cup.jpg|A cup made of root burr wood from the Essaouira area of Morocco
Image:Koeh-270.jpg|Illustration from Koehler's ''Medicinal-Plants'' (1887)
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