Trees , 21-35 m; crowns spreading, commonly vase-shaped. Bark light brown to gray, deeply fissured or split into plates. Wood soft. Branches pendulous, old-growth branches smooth, not winged; twigs brown, pubescent to glabrous. Buds brown, apex acute, glabrous; scales reddish brown, pubescent. Leaves: petiole ca. 5 mm, glabrous to pubescent. Leaf 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. Inflorescences fascicles, less than 2.5 cm, flowers and fruits drooping on elongate pedicels; pedicel 1-2 cm. Flowers: calyx shallowly lobed, slightly asymmetric, lobes 7-9, margins ciliate; stamens 7-9; anthers red; stigmas white-ciliate, deeply divided. Samaras 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. Seeds thickened, not inflated. 2 n = 56. Flowering winter-early spring. Alluvial woods, swamp forests, deciduous woodlands, fencerows, pastures, old fields, waste areas; planted as street trees; 0-1400 m; Man., N.B., N.S., Ont., P.E.I., Que., Sask.; Ala., Ark., Conn., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Mont., Nebr., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Okla., Pa., R.I., S.C., S.Dak., Tenn., Tex., Vt., Va., W.Va., Wis., Wyo. 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).

PLANT: Naturalized trees to 35 m tall; buds lance ovoid; bark of mature trunk gray, furrowed. LEAVES: blade ovate oblong to obovate, 7 15 cm long, 3 7.5 cm wide, the base asymmetrical, the apex acuminate, glabrous to scabrous above, pubescent to sub glabrous below, with tufts of hairs and/or domatia in vein axils; margins twice serrate; 1 12 of the lateral veins forking per side in ours. INFLORESCENCE: pendulous fascicles, appearing before the leaves, the pedicels 1 2 cm long. FLOWERS: calyx 7 9 lobed; stamens 7 9. SAMARAS: ovate to elliptic, flat, ca. 1 cm long, deeply notched apically, ciliate. 2n = 56. NOTES: Widely cultivated, apparently naturalized at only 2 AZ localities: Canyon de Chelly, Apache Co., 1747 m (5730 ft), and Tempe, Maricopa Co., ca. 350 m (1100 ft); winter to early spring; native to e U.S. and se Can., e of the Rocky Mts., cultivated there and elsewhere, reportedly escaped in other places such as ID. Valued shade tree. Susceptible to Dutch elm disease. REFERENCES: Brasher, Jeffrey W. 2003. Ulmaceae. J. Ariz. – Nev. Acad. Sci. Volume 35(2).