FOSSIL FAUNA AND FLORA OF THE FLORISSANT SHALES 1 73 



deri (P. balsamoides (?) latijolia Lx.') has very large broad leaves; of the same 

 general type, but smaller, more obtuse, and with different veining, is P. ardica 

 Heer, which Kirchner lists from Florissant, but probably in error. Knowlton, 

 however, says it is abundant from the Laramie to the Miocene; no doubt the name 

 has been used to designate leaves of this type, which may or may not be conspe- 

 cific. P. pyrijolia Kirchner, and P. oxyphylla Sap., Lx., probably represent large 

 and small leaves of the same species. In view of the general improbability of our 

 species being identical with that of Saporta, I should prefer to use Kirchner's name. 

 Still another species, represented by leaves not unlike the smaller and shorter ones of 

 P. lesquereuxi, is referred to P. zaddachi Heer, but is said not to be typical. 



Of Salix, Lesquereux has described S. libbeyi and 5. amygdalcefolia, the latter 

 also said to occur in the John Day Miocene. Kirchner lists four others, but they 

 represent obsolete or dubious identifications. A fine leaf of an apparently new 

 species was found by Messrs. Henderson and Ramaley. 

 MyricacecR (about 10 species) 



Comptonia is represented by C. insignis (Myrica insignis Lx.) and C. acuii- 

 loba {Myrica latiloba acutiloba Lx.); the latter I should think merely a small leaf 

 of the former, except that the veining does not seem quite the same. Two species, 

 described as Myrica, can be segregated under Morella, following Dr. Small. These 

 are Morella hendersoni (Ckll.), based on an excellent specimen secured by Messrs. 

 •Henderson and Ramaley, and M. bolanderi {Myrica bolanderi Lx., 1878; Ilex 

 imdulata Lx., 1874, not of Heer, 1859). The locality of the latter is not entirely 

 without doubt. 



There remain, still in Myrica, six species described by Lesquereux, and four 

 others recognized as pertaining to species described from Europe by Unger, Saporta 

 and Schimper. Judging from the figures, I should think that M. jallax Lx., M. 

 obscura Lx., and M. rigida Lx., might very well represent variations of M. dry- 

 tneja (Lx.) Knowlton; Lesquereux suggests this possibility in regard to jallax. 

 M. scottii Lx., is very like the narrower Planera leaves, but the venation differs. 

 M. amygdalina Sap., Lx., is perhaps too near M. acuminata Ung., Lx., M. poly- 

 morpha Schimp., Lx., exceedingly like M. scotti. M. zachariensis Sap., is figured 

 both from Florissant and Alkali Station, Wyo., but the figures seem to me to repre- 

 sent different things. 



JuglandacecB (4 or 5 species) 



An involucre, not figured, is referred to Engelhardtia oxyptera Saporta. Hie- 

 aria juglandiformis (Sternb.) Knowlton, a species described from Europe, is recog- 

 nized from good specimens of the leaves; it is also reported from the Miocene of 

 California. Two others European species are hypothetically recognized from 

 nuts. Of Juglans we have /. affinis ELirchner, /. florissanti Lx. (not figured) 



' The name latijolia was earlier (1794) employed in this genus by Moench, for a tree now considered a 

 variety of P. balsamijera. 



