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''Juniperus deppeana'' (alligator juniper or checkerbark juniper; Native American names include ''táscate'' and ''tláscal'') is a small to medium-sized tree reaching 10–15 m (rarely to 25 m) tall. It is native to central and northern Mexico (from Oaxaca northward) and the southwestern United States (Arizona, New Mexico, western Texas). It grows at moderate altitudes of on dry soils. The bark is usually very distinctive, unlike other junipers, hard, dark gray-brown, cracked into small square plates superficially resembling alligator skin; it is however sometimes like other junipers, with stringy vertical fissuring. The shoots are 1-1.5 mm diameter; the leaves are arranged in opposite decussate pairs or whorls of three; the adult leaves are scale-like, 1-2.5 mm long (to 5 mm on lead shoots) and 1-1.5 mm broad. The juvenile leaves (on young seedlings only) are needle-like, 5–10 mm long. The cones are berry-like, 7–15 mm in diameter, green maturing orange-brown with a whitish waxy bloom, and contain 2-6 seeds; they are mature in about 18 months. The male cones are 4–6 mm long, and shed their pollen in spring. It is largely dioecious, producing cones of only one sex on each tree, but occasional trees are monoecious. There are five varieties, not accepted as distinct by all authorities: *''Juniperus deppeana'' var. ''deppeana''. Throughout the range of the species. Foliage dull gray-green with a transparent or yellowish resin spot on each leaf; cones 7–12 mm diameter. *''Juniperus deppeana'' var. ''pachyphlaea'' (syn. ''J. pachyphlaea''). Arizona, New Mexico, northernmost Mexico. Foliage strongly glaucous with a white resin spot on each leaf; cones 7–12 mm diameter. *''Juniperus deppeana'' var. ''robusta'' (syn. ''J. deppeana'' var. ''patoniana''). Northwestern Mexico. Cones larger, 10–15 mm diameter. *''Juniperus deppeana'' var. ''sperryi''. Western Texas, very rare. Bark furrowed, not square-cracked, branchlets pendulous; possibly a hybrid with ''Juniperus flaccida''. *''Juniperus deppeana'' var. ''zacatecensis''. Zacatecas. Cones large, 10–15 mm diameter. ==References and external links== *Adams, R. P. (2004). Junipers of the World: The genus Juniperus. Trafford Publishing ISBN 1-4120-4250-X *(Gymnosperm Database: ''Juniperus deppeana'' ) *(Flora of North America: ''Juniperus deppeana'' ) *(USDA Plant Profile: ''Juniperus deppeana'' ) * 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Juniperus deppeana」の詳細全文を読む スポンサード リンク
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