NO. 1884 FOSSIL PLANTS KNOWLTON 495 



that Sphenoptcris Bloiiistrandi Heer,*^ from the Miocene or upper 

 Kocene of Greenland, is at least con-generic with it. 



Deiuistcrdtia aincricana is characteristic of the Fort Union forma- 

 tion, never having been, so far as I know, found outside of it. 

 Following is a list of localities and collectors : 



Porcupine Creek, Saskatchewan ; British North American Boundary Com- 

 mission, 1875. 



Gilmore Station, North Dakota ( ?) ; Wm. Denton, about 1882. 



Black Butte, 45-50 miles south of Medora, North Dakota; Earl Douglass, 

 1905. 



Custer Trail Ranch, 5 miles south of INIedora, North Dakota; F. H. 

 Knowlton, 1907. 



Sentinel Butte, North Dakota ; F. H. Knowlton and A. C. Peale, 1907. 



Thirty-five miles southeast of Rock Springs, Wyoming, about 100 feet 

 above base of formation; C. A. Fisher, T. W. Stanton, and F. H. 

 Knowlton, July, 1908. 



* Fl. Foss. Arct, vol. I, 1868, p. 155, pi. xxix, figs, i, 5, 9 



