SALIC ACEAE (WILLOW FAMILY) 71 



H. Leaves canescent or silky at least beneath; pedicel of capsule 0-0.7 nim. 

 long. 



L Stigma short and thick; stipules none; twigs glabrous. 

 J. Capsule glabrous; leaves canescent on both surfaces or silky-tomentose 

 beneath, rarely on both sides on very vigorous shoots, W. E. S. exigua 



JJ. Capsule pubescent; leaves appressed-silky on both sides. E. 



S. argophylla (spotted willow) 

 n. Stigma long and slender; stipules present, acute, deciduous; twigs hoary- 

 pubescent. W. S. sessilifoUa (silver-leaf willow) 

 HH. Leaves glabrous on both sides; pedicel of capsule 0.5-1.5 mm. long. E. 



S. fluviatills (sandbar willow) 

 GG. Leaves elliptical to oblanceolate; blade widest at or above the middle, rather 

 closely denticulate; pistillate aments 7-8 mm. wide. W, E. 



S. melanopsis (dusky willow) 

 AA. Ament scales not pale yellow, mostly brown to black, at least the tip darker, 

 persistent. 

 K. Aments sessile, or their peduncles naked or merely with bracts. 

 L. Leaves glabrous beneath; stipules present; capsule glabrous. 

 M. Leaves glaucous, or at least distinctly pale beneath. 

 N. Most of the leaf blades widest below the middle. W. E. 



S. cordata (heart willow) 

 NN. Most of the leaf blades widest above the middle. 

 O, Bracts below the ament oblanceolate; scales long-hairy, obtuse or rounded. 

 W. E. S. piperl 



00. Bracts below the ament lanceolate; scales glabrous, acute. E. 



S. mackenzlana 



MM. Leaves deep green on both sides, never pale beneath. 



P. Leaves elliptic-oblong to oblong; ament peduncles 1-2 mm. long; stipules 



ovate to lanceolate. E. S. pseudomyrsinites 



PP. Leaves ovate to obovate; ament peduncles 2.5-4 nmi, long; stipules lunate 



to broadly ovate. E. S. pyrifolia (peak willow) 



LL. Leaves either hairy beneath or else stipules none; capsule hairy. 



Q. Leaves densely silvery-hairy beneath; style elongated; capsule silvery-hairy. 



R. Twigs densely covered with a bluish bloom, glabrous, brownish; stipules 



none or on vigorous shoots lanceolate. C. E. S. subcoerulea 



RR. Twigs not dense with bloom, either yellow or hairy; stipules none or on 



vigorous shoots lunate or reniform. 



S. Stamens 2; twigs yellow, glabrous; staminate aments 1.2-2.5 cm. long, 



their scales acute. E. S. bella 



SS. Stamen i; twigs brownish, hairy; staminate aments 2.5-5 cm. long, their 



scales obtuse. W. C. E. S. sltchensis (sitka willow) 



QQ. Leaves often hairy beneath but not silvery-hairy; style short (except in 



S. phylicifoUa); capsule pubescent or tomentose but not silvery-hairy. 

 T. Leaves glabrous on both sides, margin not revolute; style 1-1.5 mm. long. 

 C. S. phyllcifolla (tea-leaved willow) 



TT. Leaves either hairy beneath or else margin revolute; style 0-0.3 mm. 

 long. 



U. Tall shrubs, 3-15 ra. high, not alpine; leaves 2.5-15 cm. long; aments stout, 

 2.5-7.5 cm. long; capsule 7-9 n^m. long. 

 V. Capsule pubescent; scales black. W. C. E. 



S. scouleriana (scouler willow) 

 W. Capsule tomentose; scales yellow. W. 



S. hookerlana (hooker willow) 

 TJU. Low shrubs, less than i m. high, alpine; leaves 0.7-4.5 cm. long; aments 

 not particularly stout, less than 2,5 cm. long; capsule 2.5-5 mm. long. 



