FOSSIL FLORA. 733 



Celastrus hslequalis n. sp. 

 PI. XCVIII, fig. 3. 



Leaf of firm texture, elliptical-obovate in outline, strongly unequal- 

 sided, rounded, obtuse above, and narrowed below into an apparently 

 winged petiole; margin strongly sinuate-dentate from above the lower 

 third or half of the blade ; niidrib thin, approximately straight ; secondaries 

 10 or 12 pairs, lower pairs opposite, others alternate, two lower pairs, 

 and about 6 secondaries on the larger side of the blade at right angles to 

 the midrib, those on narrow side of blade and in upper portion of other 

 side from right angle to 45° or more, all camptodrome, arching upward 

 abruptly near the margin and apparently joining, sending branches from 

 the outside to the teeth and other parts of the margin; nervilles and finer 

 nervation obsolete. 



This species, as exemplified by the specimen figured, is very peculiar. 

 It is 7 cm. long- and a little more than 4.5 cm. wide. It is abruptly obtuse 

 at apex and appears to be expanded at base into a winged petiole. 



The margin in the lower portion is quite entire, while above it is 

 strongly sinuate-toothed. The nervation is markedly peculiar. The lower 

 secondaries are at right angles with the midrib, as are several more on the 

 broader margin, while those on the narrow side of the blade all arise at 

 a less angle and curve abruptly near the margin. Those in the extreme 

 tip of the blade curve very much after the manner of Cornus. All send 

 branches from the outside to the teeth. The finer nervation is not 

 preserved. 



This species is wholly unlike any with which I am familiar. It 

 possesses the character described by Professor Ward 1 as especially 

 characteristic of the American fossil forms of this genus, namely, the 

 arching of the secondary nerves near the extremities, with short subsidiary 

 nerves to the marginal teeth. Its unequal-sidedness, winged petiole, 

 and sinuate teeth above the middle of the blade seem to still further 

 characterize it. 



Habitat: Yellowstone River, one-half mile below the mouth of Elk 

 Creek, base of bluff; collected by F. H. Knowlton, August, 1888. 



1 Types of the Laramie PL, p. 78. 



