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Ulmus americana 'Iowa State' : ウィキペディア英語版 | Ulmus americana 'Iowa State'
The American Elm cultivar ''Ulmus americana'' 'Iowa State' was cloned from a tree discovered by Professor Alexander (Sandy) McNabb of Iowa State University as the sole survivor in of diseased elm at Burlington.〔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 tree is possessed of a fastigiate, thickly-branched habit, but has relatively weak branch unions owing to acute angles of attachment leading to bark inclusions. One of the original plantings (1978) in the Dean Park area of Minneapolis had to be felled in 2012, 34 years later, after serious defects developed.〔 Blair, (2013). Goodbye to 'Iowa State'. ''Elm Archives - Trees''. University of Minnesota. () 〕
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