37 
THOMAS’ ELM. 
ULMUS racemosAj (Thomas;) foliis ovatis acuminatis dupli- 
cato-serratis glabris subtus pubescentibus; floribus racemo- 
sis fasciculatis . 
Ulmus racemosa, flowers in racemes; pedicels in distinct 
fascicles, united at their bases; leaves ovate, acuminate, doubly 
serrate, glabrous above, [minutely] pubescent beneath; stig- 
mas recurved. Eaton’s North Am. Bot. (ed. 8.) p. 464. 
Thomas, in Silliman’s Journ. Sci., vol. 19. p. 170, with a Plate. 
This species, confounded with our other Elms, is, ac- 
cording to Professor Torrey, an abundant species in the 
western part of the State of New York, and probably of 
the Western States generally. Mr. Thomas, its disco- 
verer, found it in Cayuga county, in the State of New 
York, and in the adjacent country. According to G. B. 
Emerson, Esq., Mr. Oakes, he believes, has obtained 
specimens from Vermont, collected by Dr. Robbins, so 
that it is probably a northern and western species. 
The lower stout branches, according to Mr. Thomas, 
produce corky excrescences like the Wahoo Elm. 
Leaves broad-ovate acuminate, obliquely auriculated on 
one side, doubly serrate, smooth, and somewhat shining 
above, with the under surface and ribs minutely pubes- 
cent. The flowers, unlike any other Elm, are disposed 
in racemes, composed of several clusters of 2 to 4 
together and extending to the length of 1 to 2J inches, 
often furnished with one or two small but perfect leaves 
before the terminal buds are open; the flowers dis- 
tinctly pedicellate. Calyx 7 to 8 cleft. Stamens 7 to 
10. Stigmas 2, recurved. Samara elliptic, large and 
very pubescent, with the margin thickly fringed, and 
the membrane more extended on one side as indicative 
of a second but abortive cell. 
Plate XII. 
A branch of the natural size, a . The flower, b. A branch 
with the corky bark. 
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