39 °] ENGELMANN—OAKS OF THE UNITED STATES. 
J 9 
elliptical to obovate, entire or often coarsely 3-dentate at the apex, occa¬ 
sionally with a few teeth on the sides; 4-7 inches long, 2 or 3 wide; 
base rounded or acutish; upper surface dark, shining green, lower one 
pale, and in September not quite glabrous; petiole 4-10 lines long. Acorns 
closely sessile; the hemispherical, turbinate, canescent cup about half¬ 
enclosing the globose nut. 
5. cinereo-Catesbcei ; J^. sinuata, Walt. Car. 235, DC. l. c. 74. It is 
quite probable that in the tree observed by Dr. Mellichamp, several 
years since, near Bluffton, S, C., and not far from Walters’ abode, we 
meet with Walters’ obscure and long ignored species. Mr. Ravenel has 
also observed a similar form in South Carolina, and indicated cinerea as 
one of the parents. Dr. M.’s tree grows on a sandy ridge with Catesbcei, 
falcata. , and virens; cinerea not far off, but rare; it is 40 feet high and 
well grown, has a “very dark, deeply cracked bark, which is red inside 
like Catesbcei.'” Leaves 4, rarely 5-6 inches long, about half as wide, 
attenuated at base into a partially margined petiole, 3-6 lines long; leaf 
itself oblong to obvate, sometimes almost rhombic; sinuate with shallow 
obtuse lobes to divaricately dentate-lobed; lobes obtuse, or acute and bris¬ 
tle-pointed, dark green and shining on upper surface, paler but glabrous 
and with some axillary down beneath. In early youth both sides, the lower 
more than the upper, are covered with the rusty, articulated pubescence of 
Catesbcei , and are as it seems imbricative in vernation. Male flowers with 
4 large, pointed anthers. Acorns sessile; cup hemispherical, turbinate, 
8-10 lines wide, 5 or 6 high; nut oval, 8-9 lines high and 6-8 thick, £ or 
£ covered by the cup.—One of the parents is doubtless Catesbcei , as the 
other cinerea, falcata , or perhaps aquatica , present themselves; falcata 
would produce very different leaves, aquatica grows in a different soil and 
would not probably mix with the “barren oak”; so that cinerea with its 
entire leaves remains, though rare there, as the most probable other parent. 
6. falcato-cinerea is quite a late discovery of the same successful 
explorer, who found it in the viqinity of the last mentioned hybrid. It 
still more distinctly shows its parentage.—Leaves oblong, usually obtuse 
or cordate at base; often entire or with one or a few teeth, or divaricately 
trilobed, some of them exactly resembling forms of falcata var. triloba ; 
leaves 3-5, usually 4 inches long, 1^-2 and the lobed ones over 3 inches 
wide; petiole 6-9 lines long. The upper surface of the leaves is not reticu¬ 
lated as in most allied oaks, but almost entirely smooth, like cinerea ; 
pale green ; lower side whitish canescent. Young fruit subsessile; no ma¬ 
ture acorns seen. 
<^. coccineo-ilicifolia , Gray, Man. ed. 5, p. 454, foiind by Dr. Robbins 
in Massachusetts, is unknown to me. 
Several forms of oaks have at one time or another been consid¬ 
ered as hybrids which most probably are varieties or sports of 
of one or the other of the well-established species, or, in one in¬ 
stance, seem to claim the rank of species themselves. 
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. ■ . Botanical 
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