familyUlmaceae
genusUlmus

Ulmus thomasii

Sargent

Silva 14: 102. 1902.

Common names: Rock elm orme de Thomas
EndemicIllustrated
Basionym: Ulmus racemosa Thomas 1831
Treatment appears in FNA Volume 3.

Trees, to 30 m; crowns oblong. Bark gray, deeply fissured with broad, flattened ridges. Wood hard. Branches short-spreading, young branches pubescent, old-growth with 3-5 prominent, irregular, corky wings; twigs reddish, pubescent. Buds brown, ovoid, acute, pubescent; scales brown, pilose on outer surface, ciliate on margins. Leaves: petiole ca. 5 mm, pubescent. Leaf 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. Inflorescences racemose cymes, long-pendulous, (7-)10(-13)-flowered, to 5 cm; pedicel 0.5-1 cm. Flowers: calyx deeply lobed, divided nearly to middle, lobes 7-8; stamens 5-8; anthers dark purple; stigmas greenish, pubescent. Samaras elliptic to oval, 1.5-2.2 cm, narrowly winged, pubescent, margins short-ciliate, apex shallowly notched. Seeds inflated, not thickened. 2n = 28.


Phenology: Flowering spring.
Habitat: Rocky slopes, limestone outcrops, rich woods, flood plains, stream banks
Elevation: 30-900 m

Distribution

V3 488-distribution-map.gif

Ont., Ark., Ill., Ind., Iowa, Kans., Ky., Mich., Minn., Mo., Nebr., N.H., N.J., N.Y., Ohio, S.Dak., Tenn., Vt., W.Va., Wis.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Ulmus thomasii"
Susan L. Sherman-Broyles +
Sargent +
Ulmus racemosa +
Rock elm +  and orme de Thomas +
Ont. +, Ark. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, Mich. +, Minn. +, Mo. +, Nebr. +, N.H. +, N.J. +, N.Y. +, Ohio +, S.Dak. +, Tenn. +, Vt. +, W.Va. +  and Wis. +
30-900 m +
Rocky slopes, limestone outcrops, rich woods, flood plains, stream banks +
Flowering spring. +
Endemic +  and Illustrated +
Ulmus thomasii +
species +