Ulmus crassifolia |
Ulmus americana |
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cedar elm |
American elm, orme d'amérique, white elm |
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Habit | Trees, 24-27 m; crowns rounded to narrow. | Trees, 21-35 m; crowns spreading, commonly vase-shaped. |
Bark | light brown with shallow ridges and large plates. |
light brown to gray, deeply fissured or split into plates. |
Branches | often with opposite corky wings; twigs reddish brown, pubescent. |
pendulous, old-growth branches smooth, not winged; twigs brown, pubescent to glabrous. |
Buds | brown, apex acute, pubescent; scales dark brown, shiny, glabrous. |
brown, apex acute, glabrous; scales reddish brown, pubescent. |
Leaves | blade ovate to elliptic, 2.5-5 × 1.3-2 cm, base oblique or rounded to cuneate, margins crenate to doubly serrate, apex obtuse; surfaces abaxially softly pubescent, adaxially harshly 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. |
Inflorescences | fascicles, 2-5-flowered, 0.5 cm; pedicel 0.75-1 cm. |
fascicles, less than 2.5 cm, flowers and fruits drooping on elongate pedicels; pedicel 1-2 cm. |
Flowers | calyx deeply lobed, more than 1/2 its length, lobes 6-9, hairy; stamens 5-6, anthers reddish purple; stigmas white, pubescent, exserted and spreading. |
calyx shallowly lobed, slightly asymmetric, lobes 7-9, margins ciliate; stamens 7-9; anthers red; stigmas white-ciliate, deeply divided. |
Seeds | somewhat thickened, not inflated. |
thickened, not inflated. |
Wood | hard. |
soft. |
Samaras | green to tan, elliptic to oval, ca. 0.75-1 cm, pubescent, margins ciliate, cilia ca. 0.5 mm. |
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. |
2n | = 28. |
= 56. |
Ulmus crassifolia |
Ulmus americana |
|
Phenology | Flowering late summer–early fall. | Flowering winter–early spring. |
Habitat | Stream banks, low woods, low hillsides, roadsides, waste places, sometimes shade trees | Alluvial woods, swamp forests, deciduous woodlands, fencerows, pastures, old fields, waste areas, planted as street trees |
Elevation | 0-500 m (0-1600 ft) | 0-1400 m (0-4600 ft) |
Distribution |
AR; FL; LA; MS; OK; TN; TX; n Mexico
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AL; AR; CT; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; ND; NE; NH; NJ; NY; OH; OK; PA; RI; SC; SD; TN; TX; VA; VT; WI; WV; WY; MB; NB; NS; ON; PE; QC; SK
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Discussion | Except for the Suwanee River valley in Florida, Ulmus crassifolia has not been found east of Webster County, Mississippi. It hybridizes with U. serotina. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ulmaceae > Ulmus | Ulmaceae > Ulmus |
Sibling taxa | ||
Synonyms | U. americana var. aspera, U. americana var. floridana, U. floridana | |
Name authority | Nuttall: Trans. Amer. Philos. Soc., n.s. 5: 169. (1837) | Linnaeus: Sp. Pl. 1: 226. (1753) |
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