Ulmus glabra
Ulmus crassifolia
broad-leaf elm, Scotch elm, wych elm
cedar elm
gray, smooth, furrowed with age.
light brown with shallow ridges and large plates.
spreading to pendulous, glabrous, branchlets lacking corky wings;
twigs ash-gray to red-brown, villous when young.
often with opposite corky wings;
twigs reddish brown, pubescent.
obtuse;
scales reddish brown, glabrous to marginally white-ciliate.
brown, apex acute, pubescent;
scales dark brown, shiny, glabrous.
blade elliptic to obovate, (4-)7-14(-16) × (3-)4.5-8(-10) cm, base strongly oblique with lowermost lobe strongly overlapping, covering petiole, margins doubly serrate, apex long-acuminate to cuspidate, sometimes with 3 acuminate lobes at broad apex;
surfaces abaxially pale green, villous with woolly tufts in vein axils, adaxially dark green, strigose to scabrous, margins not ciliate.
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.
dense fascicles, 8-20-flowered, less than 2.5 cm, flowers and fruits not pendulous;
pedicel short, 0.4-0.8 mm, densely pubescent.
fascicles, 2-5-flowered, 0.5 cm;
pedicel 0.75-1 cm.
calyx lobed to ca. 1/2 length, lobes 4-8, reddish pubescent;
stamens 5-6, purplish;
stigmas reddish, with white pubescence.
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.
thickened, not inflated.
somewhat thickened, not inflated.
hard.
hard.
light greenish brown, elliptic to obovate with blunt or rounded tip, 1.5-2.5 × 1-1.8 mm, broadly winged, pubescent only along central vein of wing, apical cleft minute, obscured by persistent, curved styles.
green to tan, elliptic to oval, ca. 0.75-1 cm, pubescent, margins ciliate, cilia ca. 0.5 mm.
= 28.
= 28.
Ulmus glabra
Ulmus crassifolia
In the absence of carefully documented naturalized populations, the North American distribution of Ulmus glabra is very poorly known. The species is established locally in British Columbia and California, and probably elsewhere. It has been reported from Newfoundland, Nova Scotia, Ontario, District of Columbia, Illinois, Iowa, Michigan, Minnesota, Missouri, Pennsylvania, and Virginia.
Ulmus glabra is similar to U. rubra in leaf morphology but may be readily distinguished by its smooth bark and glabrous samaras. Some of the weeping elms found in cultivation are varieties of U. glabra. The common name wych is derived from Gallic and means "drooping."
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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