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The American Elm Ulmus americana cultivar 'Markham' was cloned from "an outstanding tree" growing naturally at Avon, New York before 1950 [1]. The original tree, now long dead, was of great size, and possessed an extremely pendulous branching habit [2]. It is not known if 'Markham' remains in cultivation.
[edit] References
- ^ Green, P. S. (1964). Registration of cultivar names in Ulmus. Arnoldia, Vol. 24. Arnold Arboretum, Harvard University. [1]
- ^ Peattie. (1950). A Natural History of Trees of Eastern and Central North America, p. 240.
