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Ulmus americana 'Lewis & Clark' = Prairie Expedition
The American Elm cultivar ''Ulmus americana'' 'Lewis & Clark' (selling name ) is a relatively new development from the North Dakota State University (NDSU) Research Foundation breeding programme, released in 2004 to commemorate the 200th anniversary of the eponymous expedition (). The cultivar was cloned from a tree discovered in 1994 along the Wild Rice River south west of Fargo, ND., where all those around it had succumbed to Dutch elm disease; the tree remains in perfect health (2008).
==Description==
is distinguished in maturity by its broad umbrella crown and dark green foliage. () The clone grows moderately quickly, averaging an increase of > 1 m in height per annum when young, reaching a height of <17 m in 25 to 30 years (). The leaves are < 13 cm in length by 9 cm broad, coarsely-toothed, and with a 4 mm petiole.
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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