Ulmus americana
American elm, orme d'amérique, white elm
light brown to gray, deeply fissured or split into plates.
pendulous, old-growth branches smooth, not winged;
twigs brown, pubescent to glabrous.
brown, apex acute, glabrous;
scales reddish brown, pubescent.
blade oval to oblong-obovate, 7-14 × 3-7 cm, base oblique, margins doubly serrate, apex acute to acuminate;
surfaces abaxially glabrous to slightly pubescent, tufts in axils of veins, adaxially glabrous to scabrous.
fascicles, less than 2.5 cm, flowers and fruits drooping on elongate pedicels;
pedicel 1-2 cm.
calyx shallowly lobed, slightly asymmetric, lobes 7-9, margins ciliate;
stamens 7-9;
anthers red;
stigmas white-ciliate, deeply divided.
thickened, not inflated.
soft.
yellow-cream when mature, sometimes tinged with reddish purple (s range of species), ovate, ca. 1 cm, narrowly winged, margins ciliate, cilia yellow to white, to 1 mm.
= 56.
Ulmus americana
Ulmus americana is reported as widely escaped in Idaho, which is not part of the natural range of this taxon. It is occasionally cultivated outside its native distribution, and it has escaped sporadically from cultivation. It is also reported as naturalized in Arizona, but I have seen no specimens.
Ulmus americana is the state tree for Massachusetts and for North Dakota.
The American elm is susceptible to numerous diseases, including Dutch elm disease. Ulmus americana has been a street and shade tree of choice because of its fast growth and pleasant shape and size. The species still exists in substantial numbers both as shade trees and in nature.
Numerous infraspecific taxa have been recognized in Ulmus americana (A. J. Rehder 1949; P. S. Green 1964).
Native American tribes frequently used parts of Ulmus americana for a variety of medicinal purposes, including treatment of coughs and colds, sore eyes, dysentary, diarrhea, broken bones, gonorrhea, and pulmonary hemorrhage, as a gynecological aid, as a bath for appendicitis, and as a wash for gunwounds (D. E. Moerman 1986).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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