LANCE FLORA OF EASTERN WYOMING 



97 



the remaining 2 species (Aneimia lanceolata and Platanus coloradensis) occur else- 

 where only in the Middle Park formation (Paleocene?) of Grand County, Colorado. 

 In addition to these typical Paleocene fiioral assemblages from the lower Fort 

 Union group of the Lance Creek area, Knowlton has identified another collection of 

 typical Paleocene species from somewhat higher beds of the Fort Union group a few 

 miles southwest of the Lance Creek area.^ 



COMPOSITION OF THE FLORA 

 SYSTEMATIG RELATIONSHIPS 



The fiora of the type Lance formation, as described in the present report, is 

 composed of 70 recognizable forms distributed among 32 families. The major 

 divisions of the plant kingdom are represented in the fiora as foUows: Dicotyledones, 

 55 species; Monocotyledones, 6 species; Coniferales, 2 species; Ginkgoales, 1 species; 

 Lycopodiales, 1 species; Equisetales, 1 species; FiHcales, 4 species. There are 56 

 forms referred to species previously known, 5 are described as new species, and 9 

 are given generic designation but are not specifically determinable. 



The task of allocating Upper Cretaceous species to their proper botanical 

 genera continues to be a difficult one. Many of the Lance species are still of very 

 uncertain systematic position. Others are believed to show only a family relation- 

 ship to existing forms. Not many can be shown to have a marked resemblance to 

 living genera. The systematic position of the Lance species, in so far as it is 

 beUeved to be determinable, is shown in the following list : 



Pteridophyta 

 Filicales 



Polypodiaceae 

 Asplenites tenelluni (Knowlton) Dorf, 



n. comb. 

 Woodwardial crenata Knowlton 

 Salviniaceae? 



Salvinial sp. 

 Position uncertain 



Filicites knowltoni Dorf, n. sp. 

 Equisetaies 

 Equisetacese 

 Equisetum sp. 

 Lycopodiales 

 Selaginellacese? 



Selaginellal falcata Lesquereux 

 Spermatophyta 

 Gymnospermae 

 Ginkgoales 

 Ginkgoacese 



Ginkgo adiantoides (Unger) Heer ? 

 Coniferales 

 Taxodiacese 



Sequoia dakotensis Brown 

 Araucariacese 



Araucarites longifolia (Lesquereux) 

 Dorf, n. comb. 



Angiospermae 

 Monocotyledones 

 Typhacese 



Typha sp. 

 Cyperacese 



Cyperacites sp. 

 Palmse 



Sabalites eocenica (Lesquereux) Dorf 

 Sabalites montana (Knowlton) Dorf 

 Aracese 



Pistia corrugata Lesquereux 

 Cannaceae 



Canna? niagmfolia Knowlton 

 Dicotyledones 

 Salicacese 



Salix lancensis Berry 

 Saliciphyllum wyomingensis (Knowl- 

 ton and Cockerell) Dorf, n. comb. 

 Fagaceae 



Dryophyllum subfalcatum Lesquereux 

 Quercophyllum gardneri (Knowlton) 

 Dorf, n. comb. 

 Moraceae 



Ficus planicostata Lesquereux 

 Platanaceae 



Platanophyllum montanum (Brown) 

 Dorf, n. comb. 



' Wincheeter. D. E., op. cit., 481-483, 1912. 



