80 



United States it occurs in the Miocene of Chalk bluffs, California ; the Green River group of 

 Florissant, Colorado, and the Fort Union group of Montana and Dakota. 



"Well characterized fragments of this leaf have been met with in the Tertiary beds of the 

 Tranquille and Tulameen rivers of British Columbia. 



As elsewhere observed, the limitations of P. zaddachi are not well defined, and I have 

 selected as the type, those forms which Heer figures in his flora of Saghalien. The figures 

 given in his flora of Alaska deviate strongly, and should be assigned to P. cordifolia. 



Potamogeton sp. 



Bib : Trans. R.S.C., XIII, 1907, iv. 



From time to time, collections of Tertiary plants have embraced specimens of poorly 

 preserved plants apparently referable to the genus Potamogeton. In Dr. Daly's collection 

 from the Kettle river in 1905 there were fruits which seem to belong here. 



Potamogeton ? verticillatus, Lesq. 



Bib : Cret. and Tert. Fl., VIII., 142, pi. XXIII, f. 5, 6 : 



In 1883, Lesquereux described a specimen from the G-reen River group of Florissant, 

 Colorado, which he believed to be a Potamogeton, and assigned to it the name of P. verticilla- 

 tus. In Lambe's collections from the Tulameen river in 1906 there was a specimen which 

 seemed to be identical with Lesquereux's specimen. It may be described as follows : 



Leaves thin, slender, linear lanceolate, 45 mm long, whorled ; 2 mm broad, diminishing 

 slightly at the base ; slightly channelled above. 



Prunus merriami, Knowlton. , 

 Bib : U.S. Geol. Surv., Bull. 204, 67, pi. XI, f. 2, 3, 6, 7. 



This somewhat recently discovered species from the Miocene of Van Home's ranch, in 

 the John Day basin, Oregon, is represented by a single specimen in the Tertiary flora of 

 Quilchena, British Columbia. 



Pseudotsuga miocena, Penh. 

 Bib : Trans. R.S.C.,, VIII, 1902, iv, 68; IX, 1903, iv, 38. 



This species is represented altogether by the wood, and as yet it has not been found else- 

 where than in Canada. It was first observed in the Miocene of the Horsefly river, and in 

 1903 it was obtained from the Lignite Tertiary of Porcupine creek, Saskatchewan. 



Pteris sitchenns, Heer. 



Bib: Geol. Surv. Can., N. Ser., IV, 1888-89 : Trans. R.S.C, VII, 1889, iv, : Fl. Foss. 

 Alask., 1869, 21. 



This apparently northern type of fern was first obtained by Heer from Sitka, Alaska; 

 but it has since been recorded by Sir William Dawson from the Lignite Tertiary of the Bear 

 river, Mackenzie basin. 



