162 Trans. Acad. Sci. of St. Louis. 



The plants found at Florissant belong to the Tertiary period 

 and to that division known as the Green River group. The 

 shales in which the fossil plants occur are composed of vol- 

 canic sand and ash, and are mostly drab, light-gray or light- 

 brown in color. Some of the plants have been beautifully 

 preserved. 



In the enumeration of species of the Green River group, 

 Mr. Lesquereux states that out of 228 species 152 were found 

 at Florissant. From the present catalogue it will be seen 

 that the list has been increased and that 213 species can now 

 with apparent safety be included in the flora of Florissant. 



I am greatly indebted to our paleontologist. Dr. G. Ham- 

 bach, for the privilege of examining his private collection 

 and for the kind assistance he has rendered in the preparation 

 of this work. To a number of others who have enabled me 

 to carry on the work, I should also like to extend ray sincere 

 thanks. 



In the nomenclature of some of the species, I have been 

 permitted to use the names of Dr. Gustav Hambach, Professor 

 Edmund A. Engler, President of the Academy of Science, 

 and Mr. D. S. Brown, who by his munificence has materially 

 aided the department of Natural Science in Washington 

 University. 



CATALOGUE OF PLANTS. 



CRYPTOGAMAE. 

 Char ACE AE. 



1. Chara? glomerata, Lesqx. Rept. U. S. Geol. Surv. 



8: 135. 



Musci. 



2. FoNTiNALis pristina, Lesqx. Rept. U. S. Geol. Surv. 



8:135. 



3. Htpnum Brownii, sp. nov. Infra, p. 178. PI. XII. fig. 



4, 4a. Z)?\ Hambach. 



4. H. Haydenii, Lesqx. Rept. U. S. Geol. Surv. 7:44. 



