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Ulmus mexicana
''Ulmus mexicana'' (Liebm.) Planch., the Mexican elm, is a large tree endemic to Mexico and Central America. It is most commonly found in cloud forest and the higher elevations (800–2200 m) of tropical rain forest with precipitation levels of 2–4 m per annum,〔Moreira, I. & Arnaez, E. (2003) Ulmus mexicana (Liebm.) Planch., ''Tropical Tree Seed Manual'', p. 770–771, RNGR, USDA Forest Service, USA. ()〕 ranging from San Luis Potosi south to Chiapas in Mexico, and from Guatemala to Panama beyond. Natural regeneration is poor. The tree was first described botanically in 1873.〔(【引用サイトリンク】title=Plant Name Details for ''Ulmus mexicana'' )〕
==Description==
''Ulmus mexicana'' is probably the tallest of all the elm species, occasionally reaching a height of 84 m (273 feet), and a d.b.h. of 2.5 m (8 feet), certainly one of the tallest trees in Mexico.
Apart from its size, the tree is also distinguished by its deeply fluted grey trunk, supporting a deep crown, its dense foliage casting a heavy shadow. The leaves vary widely in size from 3–16 cm in length by 2–7 cm breadth, elliptic to obovate, surface glossy, but dull on the underside, with petioles 5–10 mm long. The tree is also distinguished by its long, racemose inflorescences (< 7 cm) comprising nine clusters of 40 perfect apetalous wind-pollinated flowers which emerge between December and February. The small samarae, 9.0 × 2.3 mm, are covered with long straight hairs, and are shed in March 〔Todzia, C. A. & Panero, J. L. (2006). A new species of Ulmus (Ulmaceae) from southern Mexico and a synopsis of the species in Mexico. ''Brittonia'', Vol 50, (3): 346〕 ().
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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