Kirchner — The Fossil Flora of Florissant, Colorado. 185 



character of the leaf. In many cases where the margins of 

 the leaves are entire the nervation is camptodrome. Phmts 

 with compound leaves are not uncommon. The specimen 

 shows three leaflets, and although the leaf was probably trifo- 

 liolute, since the petiole has been broken off there remains the 

 possibility that it might have been odd-pinnate. The leaflets 

 are a little less than one centimeter long. The primary nerve 

 is strong, especially toward the base. The secondary nerves, 

 making an angle of 35°-65°, are confluent with the primary, 

 mostly curved in passing to the borders, and camptodrome. 

 The tertiary nerves are somewhat curved and form a polygo- 

 nal net-work. This leaf is comparable with R. villosa, of 

 Linnaeus. 



EBENACEAE. 



DiOSPYROS. 



13. DiOSPYROS cuspiDATA, sp. nov. (Plate XII. fig. 1). 

 Calyx thick, coriaceous, four-lobed ; lobes deeply cut» 



ovate-lanceolate, concave ; peduncle comparatively long. 



The lobes of the calyx, about one centimeter long and less 

 than half as broad, are cut nearly to the base. Their nerva- 

 tion is indistinct. On account of the overlapping of one of 

 the lobes by the opposite one, there appear to be but three 

 divisions; on closer examination, however, the remains of the 

 four sepals can be distinctly made out. In the general char- 

 acter the calyx might be compared with Macreightia crassa, 

 Lesqx., although this species is described as having only 

 three lobes. Two other species, D. brachysepala^ Al. Br., 

 and D. Copeana, Lesqx., represented by their leaves, have 

 been found at Florissant. 



SALICACEAE. 



POPULUS. 



14. PopuLUS PYRiFOLiA, sp. nov. (Plate XV. fig. 4). 



Leaf membranaceous, ovate-lanceolate, very obtuse at the 

 base, (apparently) crenulate, palmately seven-nerved; cen- 

 tral, and upper lateral primary nerves strong and straight, at 



