Ulmus thomasii Sarg.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Tree to 30 m, the thinly hairy twigs often becoming irregularly winged with 2 or more plates of cork after their second year; buds thinly hairy; lvs oblong to obovate, 8–14 cm, distinctly cordate on one side at base, glabrous above; fls in slender racemes to 4 cm; cal merely lobed; fr elliptic, 1.5–2.3 cm, pubescent on the sides, the stipe 1 mm; 2n=28. Rich upland woods; sw. Que. to Minn., s. to N.J., W.Va., w. Va., Tenn., and n. Ark. (U. racemosa Thomas)