42 DESCRIPTION OF SPECIES. 



Salix protesefolia, Lesqz. 

 Plate I, Figs. 14-16; XVI, Fig. 3. 

 "U. S. Geol. Eep.," vi, p. 60, pi. v, figs. 1, 4. 



The leaf figured (pi. xvi) is related to this species merely by its 

 form, resembling that of pi. v, fig. 4, of the "Report," I. c. The nervation 

 is indistinctly preserved, as in fig. 2 of the same plate. The other leaves 

 (pi. 1, figs. 14-16) are all much narrower but broader toward the base, and 

 gradually tapering to a long point. They have the same kind of venation 

 and merely I'epresent modified forms of this extremely variable .species. 



Hah. — Kansas, near Fort Harker. 



Salix Meekii, Newby. 



" Later Ext. Fl.," p. 19; " Illustr.," pi. i, fig. 1. 



Leaves petioled, thin and delicate, lanceolate, acute at both ends, entire; midrib 

 slender; secondary nerves fine, in an acute angle of divergence 35°, gently arched and 

 anastomosing near the margins. (Ny.) 



This is apparently the same species as the preceding, which, with an 

 apparent difference in the texture of the leaves, the more or less acutely 

 narrowed base, the great variety of size of the leaves, includes also the 

 two following forms: 



Hah. — Blackbird Hills. Nebraska. Dr. Hayden. 



Sali.v cuucata, Newby. 



"Later Ext. Fl.," p. 21; "Illustr.,' pi. i, figs. 2, 3. 



Leaves of medium size, sessile or short petiolate, lanceolate, acute at both ends, 

 broadest toward the apex, gradually narrowed below to the base; medial nerve dis- 

 tinct ; secondary veins delicate, with an acute angle of divergence (20°), gently arched 

 above and inosculating near the margin. (Ny.) 



The figures show the leaves larger in the middle, not toward the 

 apex; they are more rapidly narrowed to the base and abruptly curve to 

 the petiole in reaching it. 



Hah. — Mouth of Sioux River, Nebraska. Dr. Hayden. 



Salix flexuosa, Newby. 

 "Later Ext. Fl.," p. 21 ; "Illustr.," pi. i, fig. 4. 



Leaves narrow, linear, pointed at each end, sessile or very short petioled ; medial 

 nerve strong, generally somewhat flexuons ; secondary veins diverging about 40°, some- 

 what branched and flexuous, curving and inosculating near the margins. (Ny.) 



The author considers this as a variety of S. Meekii. 



Hah. — Blackbird Hills, Nebraska. Dr. Hayden. 



