SALICACEAE 35 



C. Blades broad, lanceolate to oblong-lanceolate, and 



usually paler beneath S. cordata, p. 42 



C. Blades broadly lanceolate to ovate. 



D. Upper surface shiny, apex acute, petioles glandular. 

 E. Both surfaces glabrous. 



F. Leaves ovate and short acuminate (tree) 



S. pentandra 



F. Leaves ovate-lanceolate, long acuminate 



S. lucida, p. 38 



E. Thinly covered beneath with soft hairs 



S. lucida var. intonsa, p, 39 



D. Upper surface dull, apex acute, petioles not glan- 

 dular S, adenophylla, p. 46 



IL Leaves green above, whitened with bloom beneath (glau- 

 cous). 



H. Margins distinctly, if only finely, serrate. 

 L Petioles glandular. 



J. Blades lanceolate, acuminate. 



K. Blades linear-lanceolate; branchlets pendulous, 



slender and tough (introduced tree) 



S. babylonica 



K. Blades broader, lanceolate; branchlets spreading, 

 stouter and fragile. 

 L. Blades somewhat sericeous; teeth very close 



together (introduced tree) S. alba 



L. Blades glabrous; teeth farther apart 



S. f ragilis, p. 40 



J. Blades elliptical, acute S. serissima, p. 39 



L Petioles not glandular. 



M. Blades narrowly lanceolate, acuminate. S. longipes, p. 36 

 M. Blades broadly lanceolate to ovate. 



N. Leaves ovate-lanceolate ; acuminate ; petioles long 



and slender (tree) S. amygdaloides 



N. Leaves ovate, short acute ; petioles short 



S. glaucophylla, p. 44 



M. Blades lanceolate, acute. 



O. Leaves glabrous or only slightly hairy. 

 P. Pale green or subglaucous beneath, coarsely 



reticulated above S. cordata, p. 42 



P. Glaucous and finely reticulated above and 



below S. petiolaris, p. 49 



O. Blades pubescent beneath, glabrous or only finely 

 hairy above. 

 Q. Leaves gray pubescent and reticulated beneath 



S. capraea, p. 58 



Q. Leaves silvery-silky, not reticulated beneath. 



R. Pubescence silvery-silky only S. sericea, p. 54 



R. Pubescence with tawny hairs intermixed 



S. subsericea, p. 56 



H. Margins entire or at most remotely dentate or serrulate, 

 mostly revolute. 



