282 UXITED STATES GEOLOGICAL SURVEY— TERTIARY FLORA. 



Habitat. — The first specimens were communicated by Dr. J. L. LeConte 

 from the upper end of Purgatory Canon, New Mexico. I found some later 

 at Golden, Colorado, and small fragments at Evanston, Wyoming. These 

 last, very incomplete, may be referable to the following species. 



Kliamnus intermedins, Lesqx. 

 Plate LIV, Fig. 3. 



Rhamnus inlermedius, Lesqx., Annual Report, 1871, p. 286. 



Leaf oblong-elliptical, somewhat thick, very entire; Becondary nerves close and nnmeroas, thick, 

 camptodrome. 



By its close nervation, this leaf, the only one found, is allied to the former 

 species, differing evidently, however, by the thick lateral veins, slightly more 

 curved in traversing the lamina, and by the bows, which, though close to the 

 borders, are easily discernible. The shape is elliptical; the top and base 

 being apparently obtuse. It rather resembles a Berchemia than a Rhamnus. 

 Tlie characters are intermediate between those of the former and of the 

 following species. 



Habitat. — Near Bridger's Pass, Wyoming, with Platamis Haydeniiy 

 Magnolia species, etc., a station referable to the first or second group. 



Blianinns salicifolius, Lesqx. 



Plate LIII, Figs. 9, 10. 



Rhamnus salidfoUus, Lesqx., Aunaal Report, 1869, p. 196 ; 1872, p. 400. 



Leaves narrowly lanceolate, acuminate, narrowed to a short petiole, entire ; secondary veins at 

 an acute angle of divergence; nervilles close, very thin. 



These leavei5 are comparatively longer and narrower than those of the 

 former species, the lateral nerves less numerous, more variable in distance, at 

 an angle of divergence of 25° to 30°. They are slightly more curved in 

 joining the midrib, and not as thick, becoming nearly indistinct close to the 

 borders. Tliis species is closely related, by the characters of its leaves, to 

 11. Carolinianus, Walt., a species now inhabiting the swamps of the Southern 

 States. The direction of the lateral nerves is the same as in R. rectinervls, 

 from which it differs by the borders being entire at the narrowly tapering 

 point. 



Habitat. — Marshall's Mine, Colorado {Dr. F. V. Hayden). The speci- 

 men represented in fig. 10 was communicated by Prof. F. B. Meek from Black 

 Buttes, Wyoming. 



