THE VENATION OF THE SPECIES OF SALIX. 51 



meshes 



The veining, as a whole, is thin, remarkably smooth and 

 even, very brilliant by transmitted light. — Plate 1, fig. 3. 



Illustration from vicinity (cult. ). 



4. S. phylicifolia, L. — Primaries strong, distant, 

 curved-ascending fully to margin, and seldom looping ; if 

 so, loops will be weak and close to margin. Costals one to 



several. Secondar 



curvy ; 



the latter forming large meshes embracing strong terminals 

 which disappear early; comb-terminals along midrib, seen 

 only in young leaves. Secondaries have the Y fork 



frequent. 



The veining as a whole is somewhat strong, zigzag or 

 wavy, uneven, thickened at junctions. There is absence of 

 sharp angularity. Compare this with lucida to note how 



upon the eye. 



general sameness of plan with variation oi 

 a markedly different impression produced 



Plate 1, fig. 4. 



Illustration from specimens from the Arnold Arbore- 

 tum, originally from Mt. Washington, furnished by Edwin 



Faxon, Esq. 



5. S. argyrocarpa, Anders. — Primaries close, zigzag, 

 quite regular, forming from base to tip a more or less 

 regular series of parallel, blunt loops, having seldom any 

 costals intervening. Secondaries usually regular. Tertia- 

 ries, merging into terminals, gnarled, not forming definite 

 meshes (in young leaves faint arborescent terminals seen 

 in the background), cause an impression of large reticu- 

 lation. Along margin some crenate veining. 



As a whole the lines of veining appear crooked or wavy, 

 and, though classed as regular, the impression is decidedly 

 different from that of 8. alba. — Plate 1, fig. 5. 



Illustration from specimens from the Arnold Arbore- 

 tum, originally from Mt. Washington, furnished by Edwin 



Faxon, Esq. 



6 



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