46 BULLETIN OF THE 
Cupulifere. 
24. Quercus Haydingert, Ett. 2 specimens. 
25. Quercus straminea? Lx. The leat which I refer to this species is oval, 
apparently denticulate near the apex, and narrower than those figured in the 
U.S. Geol. Surv. of the Terr., VII., Plate XIX. figs. 6,7. It may therefore 
belong to a different species. The facies and nervation are the same, and in 
these last two leaves the upper part is destroyed. 2 specimens, 
26. Quercus viburnifolia, Lx. 11 specimens. 
27. Quercus pseudo-alnus, Ett. 1 specimen. 
28. Quercus celastrifolia, sp.nov. Leaves subcoriaceous, oval, equally nar- 
rowed at both ends, obtusely pointed; secondaries very oblique, distant, par- 
allel from the base, curving in passing toward the borders, ascending along 
them, nearly simple, passing upward under the teeth and joined to them by 
short branches. 
The teeth are acute, turned upward, one at the end of each of the secon- 
daries which are subopposite in 5 or 6 pairs ; nervilles thin, at right angles to 
the medial nerve, except near the borders, where they turn upward like thin 
tertiary nerves. The leaves are 5-6 cm. long, 3-3} cm. broad, the angle of 
divergence 30-35°. 3 specimens. 
29. Quercus coloradensis, sp. nov. Leaves subcoriaceous, entire, oblong, 
obtuse, rounded at the base and abruptly decurring in joining the petiole 
(broken) ; secondaries 5-6 pairs, at an acute angle of divergence, campto- 
drome, the lower ones branching, all connected by distinct though thin ner- 
villes and running high up along the borders which are parallel in the middle. 
By the size and form of the leaves, 5 to 6 cm. long, 3 to 4 em. broad in the 
middle where they are somewhat contracted, the species is related to Quercus 
Oreadum, Sap., Fl. de Cumi, Ann. Soc. Nat., Plate II. fig. 11. 2 specimens. 
30. Quercus Whiter, sp. nov. Leaves of medium size, membranous, ovate- 
lanceolate, cuneiform to the base, short-petioled, regularly more or less deeply 
dentate; secondaries straight, oblique, equidistant, simple, parallel, each en- 
tering one of the teeth which are gibbous on the back. 
This fine species is closely allied to Q. elymodrys, Massal., Foss. FI., PL 
XXIL., XXIIL., fig. 10, 12, especially with the variety described as Castellinensis 
by Capellini, Form Gessosa, p. 52, Plate V. fig. 1. It is also allied to Q. fur- 
cinervis, Rossm., differing from both by the subdentate or umbonate teeth, 
resembling those of @. platonia, Heer. The secondaries at an angle of 40° are 
straight, the upper ones only slightly curved. The teeth, short upon some 
leaves, as long as 4 cm. upon others, are always distant and bossed on the back. 
The leaves average 7 cm. long, and 4 cm. broad in the middle. 6 specimens. 
Salicineze. 
31. Populus Ungeri, Lx. The specimen referred to this species is a frag- 
ment, the lower half of a leaf, apparently round, entire on the borders and 
