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''Eucalypus expressa'', the Wollemi Stringybark, is a recently discovered Australian tree species.〔Bell, S.A.J. (2008) Rare or threatened vascular plant species of Wollemi National Park, central eastern New South Wales. Cunninghamia 10(3): 331-371.〕〔Binns, D. (1996) Flora Survey, Morisset Forestry District, Central Region, New South Wales. Forest Resource Series 35. State Forests of New South Wales, Pennant Hills.〕 It is a tall forest tree from at least seven populations in sheltered gullies in the sandstone ranges north-west of Sydney. A ROTAP rarity rating of 2KC has been proposed for this species.〔Poorly known species suspected of being at risk, occurring in a range of less than , at least partially conserved in a national park〕 Usually seen between tall, it is most closely related to ''Eucalyptus eugenioides'', and was previously known as ''E.'' sp. aff. ''eugenioides'' (Bees Nest Ridge).〔 The specific epithet ''expressa'' is from the Latin ''expressus'', which means “prominent and clearly exhibited”. This refers to the long, narrow and prominently external valves of the gumnuts. Another interesting feature of this plant is the somewhat scalloped or irregularly toothed leaf edges. It occurs in and near Wollemi National Park and Yengo National Park. The original specimen was collected beside the Putty Road. The trunk is cylindrical and tall, grey brown, with reddish stringybark tinges. Adult leaves are thin and broad-lanceolate in shape, long by wide on a leaf stem. Uneven at the base and with an intramarginal leaf vein. The veins at arise at an angle of 30 to 40 degrees to the midrib. The leaf is the same colour green above as below, and the leaf margins are scalloped. The gumnuts measure on a stem. Truncate globose or hemispherical, they have 3 or occasionally 4 valves, extending beyond the rim of the gumnut. There is little information yet available about the flowering of this species.〔Klaphake, V. (2010) Eucalyptus of the Sydney Region. Second edition〕 ==See also== * Wollemi Pine * Wollemi Mint Bush 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「Eucalyptus expressa」の詳細全文を読む スポンサード リンク
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