SALICACEAE 279 



?0?lJL\JS— continued 



Cottonwood. 50. February-March. D. Buds large and sticky. Ls. ov., 



5, somewhat coarsely round-toothed, straight or heart-shaped base, dark 



green above, whitish below. North America. (Fig. no g.) 

 P. lasiocarpa. 60. D. Branchlets stout, downy. Ls. heart-shaped, 12, 



shallowly round-toothed, green below, 1. -stalk and chief veins red. China. 

 P. szechuanica. 100. D. Branchlets angled. Ls. heart-shaped, 9, finely 



toothed, greyish below, 1. -stalk and chief veins red. China. (Fig. iioK.) 

 P. trichocarpa. Black Cottonwood. 200. D. Ls. ov., 8, finely toothed, dark 



green above, white and net-veined below. West North America. 



(Fig. 1 10 J.) 

 P. Wilsonii. 80. D. Branchlets stout, cylindrical, hairless. Ls. heart-shaped, 



9, minutely toothed, dull pale green above, greyish below. China. 



SALIX. Willow. Branchlets usually very tough, without terminal bud; buds 

 I -scaled. Ls. short-stalked. Catkins erect; stamens usually two to five, rarely more. 



{a) Adult Is. hairy or downy below 



S. alba. White Willow. 80. May. D. Branches drooping at ends; branch- 

 lets olive-brown, at acute angle. Ls. lane, 3-3-, finely toothed, silky 

 hairs below. Stamens two. Europe (including Britain), Asia, North 

 Africa. (Fig, in a.) 



Variety argentea. Silver Willow. Ls. of intense silvery colour. 



Variety britzensis. Branches red. 



Variety coerulea. Cricket Bat Willow. 100. Branches erect. Ls. 



become hairless and blue-grey below in late summer. 



Variety vitellina. Golden Willow. Branchlets yellow. 



S. Andersoniana. 10. April-May, D. Like S. phylicifolia (see below under 

 {b) ), but twigs and Is. more downy and ovary hairless. Europe (including 

 Britain). (Fig. mo.) 



S. Arbuscida. 3. May. D. Ls. ov., lane, 2, deep green above, grey below, 

 toothed or entire. Stamens two. Europe (including Scottish mountains) 

 and North Asia. (Fig. in B.) 



S. aurita. Round-eared Willow. 6. April. D. Twigs downy ; buds brown or 

 green. Ls. obov., 2, vaguely toothed, dark green and wrinkled above, 

 grey wool below, a pair of broad stipules at base of 1. -stalk. Stamens 

 two. Europe (including Britain) and North Asia. (Fig. in c.) 



S.Caprea. Goat Willow, Sallow ('Palm'). 25. March-April. D. Branchlets 

 downy; buds yellow. Ls. ov., 4, vaguely toothed, dark green and slightly 

 wrinkled above, grey wool below. Stamens two. Europe (including 

 Britain) and North Asia. (Fig. in D.) 



S. cinerea. Grey Willow. 10. March-April. D. Branchlets and buds covered 

 with grey down. Ls. ov., 3^, entire or vaguely toothed, dull grey and 

 slightly hairy above, grey wool below. Stamens two. Europe (including 

 Britain) and North Asia. (Fig. in H.) 



S. incana {S. rosmarinifolid). 12. April-May. D, Buds yellow. Ls. linear, 

 5, dark green above, white-felted below, margins recurved. Stamens 

 two. Europe. (Fig. 53 a.) 



.S. /an«^a. Woolly Willow. 3. May. D. Branchlets woolly. Ls. roundish 

 ov., 2, entire, silvery on both sides, stipules large. Europe (including 

 Scotland) and North Asia. (Fig. 128 o.) 



