Ulmus americana

Linnaeus

Sp. Pl. 1: 226. 1753.

Common names: American elm orme d'Amérique
EndemicIllustrated
Synonyms: Ulmus americana var. aspera Chapman Ulmus americana var. floridana (Chapman) Little Ulmus floridana
Treatment appears in FNA Volume 3.

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. 2n = 56.


Phenology: Flowering winter–early spring.
Habitat: Alluvial woods, swamp forests, deciduous woodlands, fencerows, pastures, old fields, waste areas, planted as street trees
Elevation: 0-1400 m

Distribution

V3 188-distribution-map.gif

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.

Discussion

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).

Selected References

None.

Lower Taxa

None.
... more about "Ulmus americana"
longitudinal +
acute +  and acuminate +
Susan L. Sherman-Broyles +
Linnaeus +
light-brown;gray +
fissured +
rounded;cuneate +
slender;stout +
thick-walled +
yellow +  and white +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
American elm +  and orme d'Amérique +
vase--shaped +
subsessile +  and pedunculate +
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. +  and Wyo. +
0-1400 m +
curved +  and straight +
absent;scanty +
sigmoid +  and curved +
distinct +  and free +
sessile +  and pedicellate +
Alluvial woods, swamp forests, deciduous woodlands, fencerows, pastures, old fields, waste areas, planted as street trees +
0 cm0 mm <br />0 m <br /> (?) +  and 2.5 cm25 mm <br />0.025 m <br /> (?) +
pinnate +  and palmate-pinnate +
7 cm70 mm <br />0.07 m <br /> (14 cm140 mm <br />0.14 m <br />) +
oval;oblong-obovate +
distichous +  and alternate +
deciduous +
toothed +, crenate +  and serrate +
amphitropous +, anatropous +  and pendulous +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
glabrous +  and pubescent +
5 cm50 mm <br />0.05 m <br /> (?) +
Flowering winter–early spring. +
2(-3)-carpellate +
subsessile +  and pedunculate +
tinged with reddish purple;yellow-cream +
reddish-brown +
not inflated +
valvate +  and imbricate +
persistent +
Endemic +  and Illustrated +
hypogynous +
persistent +
distinct +
2-lobed +
abaxially glabrous +  and slightly pubescent +
Ulmus americana var. aspera +, Ulmus americana var. floridana +  and Ulmus floridana +
Ulmus americana +
species +
adaxially glabrous;scabrous +
pubescent;glabrous +