DESCRIPTION OF SPECIES. 49 



It has also a (le«^ree of affinity to S. Bceuna Heer,' diffiTui;;- Ijy the more 

 coriaceous texture, the secondaries at a more open augle of divergence, the 

 areolation iireguhirl}' ])olygonal, etc. 



Habitat: Ellsworth County, Kansas. No. 788 of the collection of the 

 museum of the University of Kansas. Collected by E. P. West. 



Salix deleta, sp. uov. 

 PI. Ill, Fig. 8. 



Leaves subcoriaceous, subfalcate, ovate-lanceolate, tapering to a bhuit 

 apex, rapidly naiTOwed and cuneiform to the slightly inequilateral base, 

 entire, peuninerved; median nerve percuiTent, deeply marked but compara- 

 tively narrow; secondaries numerous, subopposite, parallel, distinctly camp- 

 todi-ome, curving in bows along the borders, separated by thinner tertiaries. 



The lateral nerves, which are all at the same angle of divergence of 

 50°, are not more than 5""° distant at the base, most of them separated by 

 an intermediate tertiary nerve vanishing above the middle in anastomosing 

 with the secondaries, or traversed at right angles by uervilles forming a 

 large quadrangular areolation. 



The appearance of the leaf is rather like that of a Ficus. The nerva- 

 tion, however, refers it to Salix, it being a jjcculiar species to which none ot 

 the willow leaves of more recent formations have any recognized affinity. 



Habitat : Pipe Creek, Cloud County, Kansas. No. 4096 of Mr. R. D. 



Lacoe's collection. 



Salix nbbvillosa Heer. 



Phyll. Cr^t. du Nebraska, p. 15, PI. i. Fig. 3. 



Salix peote^folia Lesq. 



Cret. and Tert. 71., p. 42, PI. i, Figs. 14-16; PI. xvi, Fig. 3; Cret. Fl., p. 60, PI. v. 



Figs. 1-4. 



There are so many of these leaves, and they show, taken altogether, 

 differences which, although too feeble to be considered as specific, niay l)e 

 placed under the following varieties : 



Salix prote^folia var. linearifolia Lesq. 

 PI. LXIV, Figs. 1-3. 



Leaves long, narrow, linear, sm-face smooth; texture somewhat thick; 

 secondaries not visible; midrib narrow. There are ten specimens from 

 Ellsworth County, Kansas, in Mr. R. D. Lacoe's cabinet (Nos. 436-445). 



■ Fl. Fos9. Arct., vol. I, p. 102, PI XX I, Fig. 13. 



