Ulmus glabra
Ulmus thomasii
broad-leaf elm, Scotch elm, wych elm
cork elmorme, liège, orme de Thomas, rock elm
gray, smooth, furrowed with age.
gray, deeply fissured with broad, flattened ridges.
spreading to pendulous, glabrous, branchlets lacking corky wings;
twigs ash-gray to red-brown, villous when young.
short-spreading, young branches pubescent, old-growth with 3-5 prominent, irregular, corky wings;
twigs reddish, pubescent.
obtuse;
scales reddish brown, glabrous to marginally white-ciliate.
brown, ovoid, acute, pubescent;
scales brown, pilose on outer surface, ciliate on margins.
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 obovate to oblong-oval, (2.5-)9-11(-16) × 2.5-5 cm, base oblique, margins doubly serrate, apex short-acuminate;
surfaces abaxially white-pubescent, pubescence not tufted in axils of veins, adaxially dark green, usually glabrous, sometimes scabrous.
dense fascicles, 8-20-flowered, less than 2.5 cm, flowers and fruits not pendulous;
pedicel short, 0.4-0.8 mm, densely pubescent.
racemose cymes, long-pendulous, (7-)10(-13)-flowered, to 5 cm;
pedicel 0.5-1 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, divided nearly to middle, lobes 7-8;
stamens 5-8;
anthers dark purple;
stigmas greenish, pubescent.
thickened, not inflated.
inflated, not thickened.
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.
elliptic to oval, 1.5-2.2 cm, narrowly winged, pubescent, margins short-ciliate, apex shallowly notched.
= 28.
= 28.
Ulmus glabra
Ulmus thomasii
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.)
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