T. D. A. Cocker ell — Descriptions of Tertiary Plants. 539 



Florissant, Colorado, it is represented in the Miocene by H. 

 coloraclensis CklL, while in the Miocene of Europe, at 

 Padoboj, Heyderia salicomioides {Libocedrus salicornioides 

 Heer) is very well preserved. Other species, supposed to 

 belong here, are from the Upper Cretaceous of Greenland 

 and the Miocene of Spitzbergen. 



Angio sperms. 



Ailanthiis americana sp. no v. Fig. 3. 



Samara about 38 ujm long, 9 broad ; seed 6 mm long and a little 

 over 4 broad, placed with its long axis about 15 degrees from 



Fig. 



Fig. 4. 



Fig. 3. Ailanthus 



americana. 



Fig. 4. Quercus knowltoniana. 



axis of samara ; venation of wings well preserved, agreeing 

 with that of A. glandidosa L. ; apical part with a thickening 

 along one side, as in Lesquereux, Cret. and Tert. Floras, 

 PI. xl, f. 7. 



Florissant, Station 13 B, 1903. Type at University of 

 Colorado. 



Ailanthus (wrongfully called Alianthiis in Knowlton's Cat. 

 Cret. and Tert. PI.) is at present confined to Asia, with three 

 species. It is well represented in the Tertiary beds of Europe, 

 and is credited with two American Tertiary species, one from 

 the Miocene of Oregon, the other from the Green River beds 

 of Wyoming. The Oregon species is very distinct from ours ; 

 that from Wyoming is based on a supposed leaflet with a 

 remarkably long petiole, which seems to be doubtfully of this 



