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Ulmus uyematsui
''Ulmus uyematsui'' Hayata, commonly known as the Alishan elm, is endemic to the forests (elevation ) of Alishan, Chiayi County (), central Taiwan,〔Fu, L., Xin, Y. & Whittemore, A. (2002). Ulmaceae, in Wu, Z. & Raven, P. (eds) ''Flora of China'', Vol. 5 (Ulmaceae through Basellaceae). Science Press, Beijing, and Missouri Botanical Garden Press, St. Louis, USA. ISBN 1930723407 ()〕 where it is considered one of the minor tree species.〔Hyun, S. K. (1969). White pines of Asia: ''Pinus koraiensis'' and ''Pinus armandii''. Biology of rust resistance in forest trees. Proceedings of a NATO-IUFRO Advanced Study Institute, Aug. 17 - 24, 1969. University of Idaho, USA. ''Misc. publication 1221'', p.141. USDA, Feb. 1972.〕〔(【引用サイトリンク】title=Plant Name Details for ''Ulmus uyematsui'' )〕 The tree was first named and described by the Japanese botanist Bunzō Hayata in 1913,〔Hayata, B. (1913). ''Icones Plantarum Formosanarum, Vol. 3.'' p. 174 (1913).〕 in the aftermath of the First Sino-Japanese War, when Formosa (now Taiwan) was ceded to Japan.
==Description==
The tree grows to a height of 25 m with a d.b.h. to 80 cm. The bark is grey, longitudinally fissured, and exfoliates in irregular flakes. The branchlets are brown, glabrous, though pubescent when young, and devoid of corky wings. The largely glabrous leaves are elliptic to oblong-elliptic 5–11 × 3–4.5 cm wide, typically caudate at the apex; the margins are doubly serrate (). Unlike most elms, the leaves are equal at the base, have short (2–6 mm) petioles,〔〔()〕 and are flushed dark-red on emergence. The perfect wind-pollinated apetalous flowers appear on second-year shoots in February, the obovate to orbicular samarae, 10–15 × 8–10 mm in March.〔
Hayata considered the tree similar to ''Ulmus castaneifolia'', differing only in the much thinner leaves, and absence of pubescence on the axils of the primary lateral veins.〔
Image: Ulmus uyematsui, emergent leaves.jpg|Emergent leaves with dark red colouration.
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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