COMPOSITION OF THE FLORA 



SYSTEMATIC RELATIONSHIPS 



The flora of the lower Medicine Bow formation, as here described, comprises 

 64 recognizable forms. Of these, 47 are referred to species previously described by 

 others, 11 are described as new species, and 6 are recorded as not specifically deter- 

 minable. The various divisions of the plant kingdom are represented as follows: 

 Dicotyledonse, 45 species; Monocotyledonse, 8 species; Coniferales, 2 species; 

 Equisetales, 1 species; Filicales, 3 species; position uncertain, 5 species. Within 

 most of these divisions, and in particular within the Dicotyledonae, the systematic 

 allocation to existing genera, and in some cases to famihes, is subject to revision. 

 As is discussed under each species in the section on Systematic Palseobotany, refer- 

 ences to modern genera have previously been made on the basis of leaf characters 

 which in many cascs seem only remotely comparable to the designated genera. 

 Such forms might better have been placed in non-committal form genera until con- 

 clusive evidence of their systematic status had been obtained, but are here included 

 under their assigned names to avoid confusion. 



In the following systematic list of species of the lower Medicine Bow flora, the 

 genera marked with an asterisk are of doubtful botanical significance. 



Pteridophyta 

 Filicales 



*Aspleni.umf coloradense Knowlt.on 

 *Dryopterisf carbonensis Knowlton 

 *Aneimia sp. 

 Equisetales 



Equisetum sp. 

 Spermatophyta 

 Gymnospcrmse 

 Coniferales 



Sequoia nordenskioldi Heer 

 *Scquoiaf acuminata Lesquereux 

 Angiospermse 

 Monocotyledonse 

 Typhaceae 



Typha sp. 

 Pandanaceae 



Pandanites corsoni Dorf 

 Cyperacese 



Cyperacites sp. 

 Palmse 



Sabalites montana (Knowlton) Dorf 

 Sabalites eocenica (Lesquereux) Dorf 

 *Palmocarponf subcylindricum Lesque- 

 reux 

 CannaceEe 



Canna cf. C.f magnifolia Knowlton 

 Zingiberacese 



*Zingiberites dubius Lesquereux 

 Dicotyledonse 

 Myricacese 



*Myrica torreyi Lesquereux 

 22 



Juglandaceie 



*Juglans leconteana Lesquereux 

 Juglans newberryi Knowlton 

 Juglans prccrugosa Knowlton 

 Fagacese 



Dryophyllum subfalcatum Lesquereux 

 *Que7Xus viburnifolia Lesquereux 

 Moracese 



Fictis planicostata Lesquereux 

 *Ficus cockerelli Knowlton 

 *Ficus trinervis Knowlton 

 *Ficus crossii Ward 

 *Ficus tesselata Lesquereux 

 Ficus coloradensis Cockerell 

 *Ficus cowanensis Knowlton 

 Platanacese 



Credneria protophylloides Knowlton 

 Nyctaginacese 



*Pisoniaf racemosa Lesquereux 

 Lauracese 



Cinnamomum linifolium Knowlton 

 Cinnamomum affi,ne Lesquercux 

 Laxirophyllum meeki Dorf 

 Laurus socialis Lesquereux? 

 Trochodendrace se 



Trochodendroides nebrascensis (New- 

 berry) Dorf 

 Magnoliacese 



Magnolia lakesii Knowlton 

 Magnolia dakotana Berry 



