174 UNIVERSITY OF COLORADO STUDIES 



and a form which is referred to the European /. costata Ung. In addition, Kirch- 

 ner lists /. thermalis Lx., and /. crossii Knowlton. Of these, the former belongs 

 to the Denver beds (Golden etc.,) and has apparently never been found at Floris- 

 sant; while the latter, heretofore reported from Wyoming and Montana, is recog- 

 nized in a Florissant specimen which is figured, and certainly looks like crossii. 

 It is to be remarked that /. crossii is a substitute name for /. denticulata Heer, 

 preoccupied; hence it belongs to the European plant, not to the American, should 

 the two be really distinct. 



Pterocarya americanahx., seems doubtful as to locality, and Lesquereux himself 

 says "it would be more advisable to consider the fragment as that of a leaflet 

 of Carya or of Juglans." 



Cupulijerae (about lo species) 



Of Carpinus we have C. fraterna Lx. and C. attenuata Lx. A greatly elon- 

 gated leaf of C. fraterna was found by Messrs. Henderson and Ramaley; the allied 

 modern C. americana exhibits a similar variation. In addition, C. grandis Ung., 

 is reported; but the figures appear to indicate that the Florissant leaves so-called 

 are fraterna, and are quite distinct from the plant from Elko Station, Nevada, referred 

 to C. grandis, or probably more correctly called C. elkoana (Quercus elkoana Lx.) 



Castanea intermedia Lx., is listed by Kirchner from Florissant; Lesquereux 

 and Knowlton say Middle Park. Ostrya betuloides Lx. is described, but not figured. 



Of Quercus we have Q. ramaleyi Ckll., allied to a recent species of New Mexico; 

 Q. pyrifolia Lx.; Q. osbornii Lx., having a curiously close resemblance to Rhus 

 acuminata; and Q. elcenoides Lx., also occurring in the Miocene of California. 

 The last is, I suppose, the plant reported in 1883 as Q. elana Ung. The following 

 European species are also recognized, but the first two, at any rate, are doubtful: Q. 

 neriifolia, Al. Br., Q. drymeja Ung., Q. mediterranea Ung., and Q. serra Ung. 



MoNOCOTYLEDONEs (about 5 spccies) 

 Palm(B 

 An object something like a hazel nut is described as Palmocarpon (?) glob- 

 osum Lx., its connection with the palms is quite hypothetical. Flabellaria floris- 

 santi Lx., a genuine palm, is not from Florissant, notwithstanding its name. It 

 is from the Green River beds of Wyoming, and suggests that the Green River period 

 had a warmer climate than that of Florissant. 



Lemnacece (i species) 

 Lemna penicillata Lx. ^^Spirodela penicillata. 



AracecB (i species) 

 Acorus affinis Lx., afterwards referred to A. brachystachys Heer, is a rather 

 dubious plant. 



