724 ARBORETUM EY FRUVICELTUM BRITANNICUM. 
¥* 8. U. amprica’na L. The American Elm.. 
Identification. Lin. Sp. Pl., 327. ; Pursh Sept., 1. p. 199. 
Synonymes. The white Elm, dmer.; the Canadian Elm, the American white Elm. 
Engravings. Michx. North Amer. Sylva, 3. t. 126. ; and our fig. 1401. 
Spec. Char., §c. Leaf with the petiole ] in. tol}in. long, and 
hairy with short hairs; and the disk unequal at the base, 
4 in. to 5in. long, inclusive of a long acuminate point, 2 in. 
to 24 in. broad, serrate, and mostly doubly so ; the axils 
of the veins underneath joined bya membrane. Flowers 
peduncled, effuse, purple; peduncles short, glabrous. 
Stamens 5 and 8. Samara fringed at the edge with 
hairs, ovate, acute. This species is readily distinguish- 
able from others by the membrane which appears at the \ 
axils of the veins. (Willd.) Young branches brown, 
with short very fine hairs. Leaves deeply green above, ; 
almost glossy, rough; beneath, pale, downy. Flowers {,\\\\ 
like those of U. efftsa. A large tree. New England to LN 
Carolina. Height 80 ft. to 100ft. Introduced in 1752; x 
but rarely flowering, and never ripening seeds in England. 1401. v. americana. 
Varieties. 
* U.a. lraubra Ait. Hort. Kew. i. p. 319. — Branches red. Leaves 
ovate, rugose, rough. 
¥ U.a. 2 élba Ait. Hort. Kew. i. p.319., Marsh, p. 250. ? U. molli- 
folia (Rem. et Schult.) — Branches whitish. Leaves oblong, rough. 
* U.a. 3 péndula Pursh Sept. i. p. 200., Ait. Hort. Kew. i. p. 319. 
— Branches pendulous. 
¥ U.a. 4incisa Hort. (Plate in Ard. Brit., 1st edit., vol. vii.) — This 
variety differs from the other varieties, in having the leaves some- 
what more deeply serrated, and rather smaller, approaching nearer 
to those of U. effisa. Horticultural Society’s Garden. 
¥ U.a. 5 foliis variegdtis Hort.—Leaves variegated. Hort. Soc. Garden. 
The white elm delights in low humid situations. The wood is used for the 
same purposes as that of the European elm, but it is decidedly inferior in 
strength and hardness; it has also less compactness, and splits more readily. 
Propagated by grafting on U. montana, but not common in collections. 
¥ 9. U.(s.) Fu’LvA Miche. The tawny-budded, or slippery, Elm. 
Identification. Michx. Fl. Bor. Amer., 1. p. 172.; Pursh Sept., 1. p. 200. 
Synonymes. U. ribra Michz, Arb.3. p. 278. ; Orme gras, French of Canada and Upper Louisiana ; 
red Elm, red-wooded Elm, Moose Elm. : 
Engravings. Michx. North Amer. Sylva, 3. t. 128.; and our fig. 1402. 
Spec. Char., §c. Resembles the Dutch elm. Branches rough, whitish. 
Leaves ovate-oblong, acuminate, nearly equal at the base, more or less 
cordate there; serrate with unequal teeth, rugose, very rough, hairy on 
both surfaces: they are larger, thicker, and 
rougher than those of U. americana, Leaf buds 
tomentose, with a tawny dense tomentum : they 
are larger and rounder than those of U. ameri- 
cana. Scales of the buds that include the flowers 
downy. Peduncles of flowers short. Samara 
not fringed, very like that of U. campéstris; 
orbicular, or obovate. (Michr.) Leaves variable 
in shape and serratures, but more downy than 
the other North American elms. Stamens 5—7. 
Stigmas purplish. Samara, when young, downy 
on both sides. A tree bearing a strong resem- 
blance to the Dutch elm. Canada to Carolina. 
Height 50 ft. to 60 ft. Introduced ? 1815. 
Flowers and samara as in preceding species. 
