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pinus johannis : ウィキペディア英語版
pinus johannis

''Pinus johannis'', the Johann's pine, is a pine in the pinyon pine group, native to North America. The range extends from southeast Arizona and southwest New Mexico, United States, south in Mexico along the Sierra Madre Occidental and the Sierra Madre Oriental to southern Zacatecas and San Luis Potosí. It occurs at moderate to high altitudes, from , in cool, dry climate conditions.
==Description==
''Pinus johannis'' is a small to medium-size tree, often just a shrub, reaching tall and with a trunk diameter of up to 50 cm. The bark is grey-brown, thin and scaly at the base of the trunk. The leaves ('needles') are in mixed fascicles of three and four, slender, 3–6 cm long, and deep green to blue-green, with stomata confined to a bright white band on the inner surfaces.
The cones are globose, 2–4 cm long and 2–3 cm broad when closed, green at first, ripening yellow-brown when 16–18 months old, with only a small number of thin, fragile scales, typically 6-12 fertile scales. The cones open to 3–5 cm broad when mature, holding the seeds on the scales after opening. The seeds are 9–12 mm long, with a thick shell, a white endosperm, and a vestigial 1–2 mm wing; they are dispersed by the Mexican jay, which plucks the seeds out of the open cones. The jay, which uses the seeds as a major food resource, stores many of the seeds for later use; some of these stored seeds are not used and are able to grow into new trees.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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