246 The Upper Cretaceous Floras of the World 



Persea hayana Lesquereux 



Persea schimperi Lesquereux 



Persea sternbergii Lesquereux 



Perseophyllum hauthalianum Kurtz 



Platanus obtusiloba Lesquereux 



Platanus primwva grandidentata Lesquereux 



Populus acerifolia Newberry 



Populus cf. cicrophylla Newberry 



Populus cf. nebraseensis Newberry 



Populates lancastriensis Lesquereux 



Protophyllum cf. rugosum Lesquereux 



Quercus primorclialis Lesquereux 



Salis lesquereuxii Berry 



Sassafras acutilobum Lesquereux 



Sassafras cretaceum Newberry 



Sassafras rnudgei Lesquereux 



Sassafras mudgei yar. 



Sassafras subintegrifolium Lesquereux 



Sequoia brevifolia Heer 



The foregoing list comprises thirty-one forms including new species in 

 Abietites, Araucarites, and Perseophyllum. Eliminating these there are 

 twenty-eight forms, of which twenty-one, or seventy-five per cent, are 

 characteristic types of the Dakota flora. It is a significant fact that the 

 meager flora from the heretofore most southern known Dakota outcroj) 

 containing plants, namely, the Woodbine formation of Texas, contains 

 two species that are identical with Argentinean forms. Four identical 

 forms are found in the Magothy and three in the Earitan of the Atlantic 

 Coastal Plain, two occur in the Atane beds of the west coast of Green- 

 land and one occurs in the Patoot beds of the same region. Two forms 

 are common to the Cenomanian of Bohemia and one is found in the Seno- 

 ninan of Prussia and Bulgaria. Kurtz identifies one species with a basal 

 Eocene form of North America and another with a basal Eocene species 

 of Belgium. The remarkable similarity of this flora to that developed in 

 the central West during the mid-Cretaceous certainly points very strongly 

 to a community of origin. Were the evidence less convincing in its array 

 of forms it would be an easy matter to infer that Kurtz's Liriodendron 

 meekii was a leguminous leaflet, and that his species of Cinnamomum, 

 Litscea and Sassafras were simply the Upper Cretaceous precursors of the 

 lauraceous forms which occur so abundantly in the modern flora of 



