14 FOSSIL FLORA OF THE SIERRA NEVADA. 
undeveloped leaf with reflexed borders, scarcely dentate, a mere variety 
of the normal form. The essential difference of this species from P. 
occidentalis is in the narrower shape of the leaves, longer than broad, 
and in the deeper, acute divisions. As is generally the case in leaves 
of Platanus, some are five palmately nerved, and accordingly five-lobed, 
while others have the nerves and divisions only in three. The leaves 
are not as large as in the former species; the largest one figured here 
being only fifteen centimeters long, and about twelve centimeters broad 
between the points of the lobes. 
Habitat. — Chalk Bluffs, California. Professor J. D. Whitney. More 
common in the same formation at Table Mountain, Tuolumne County. 
Voy’s Collection. 
LIQUIDAMBAR, Linn. 
Liquidambar Californicum, sp. nov. 
Pl Vi fig. (te. PUVIL fee, 
Leaves coriaceous or subcoriaceous, comparatively small, three, rarely five lobed, den- 
ticulate, lobes short, ovate, pointed, or acuminate. 
Acer denticulatum, LrsQx., Mss. 
The species is represented by many more or less fragmentary leaves, 
the more complete of which have been figured. The largest of all 
(Fig. 3) is the only one divided in five lobes. It is about twelve cen- 
timeters long, and fourteen centimeters broad between the points of the 
upper lateral lobes, deeply cordate at the base, with the borders minutely 
and equally denticulate all around. The size of the other leaves varies 
from five to eight centimeters, both ways; they are all trilobate, gen- 
erally ‘truncate or rounded to the petiole; minutely denticulate. The 
long slender petiole of some of the leaves induced me to refer them to 
Acer, in my first note on these fossil plants. Count Saporta, to whom I 
owe valuable information on the relation of some of the species described 
here, is, however, of the opinion that they represent a new JLiguidambar, 
closely allied to Z. Europeum Al. Br. of the Miocene, and still more to 
two living species recently discovered; JZ. acerifolium, Maxim., of Japan, 
and L. jauvanensis, Ol, of China, both with coriaceous, minutely denticu- 
late, three or five lobed leaves. We might also consider the Californian 
fossil species as a mere variety of L. Europewm, which, though generally 
