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Ulmus americana 'Penn Treaty'
The American Elm cultivar ''Ulmus americana'' 'Penn Treaty' was raised by the Plant Sciences Data Center of the American Horticultural Society. Plants under that name were propagated by the Morris Arboretum, Pennsylvania, Philadelphia, from grafts made in 1945 from a tree at Haverford College, itself a graft from the Shackamaxon Treaty Elm (felled by a storm in 1810) in what was later named Penn Treaty Park, Kensington, Pa.〔Santamour, F. S., & Bentz, S. E. Updated checklist of elm (Ulmus) cultivars for use in North America. ''Journal of Arboriculture'', 21(3): May, 1995.〕
==Description==
The elm at Haverford, planted in 1840, measured 90 ft (28 m) in height, with a crown diameter of 120 ft (37 m) 100 years later.
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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