ASPEN: SALLOW 255 



(basal ribs) are nearly or quite as strong as the midrib, and 

 radiate from its base into the lamina, where the midrib 

 then gives off pinnate secondaries nearly as strong. Basal 

 ribs and their outer veins converging upwards. Outer 

 veins of basal ribs perpendicular to the midrib, and straight 

 or but little curved upwards. Tertiaries principally de- 

 veloped as cross-ties. See p. 208. 



8 8 Buds viscid, and like the petioles 

 and shoots glabrous. 



Populus tremula, L. Aspen. The smaller ordinary 

 leaves, though pubescent when young, become quite gla- 

 brous on both faces, non-shining, and are nearly round and 

 on long slender petioles, trembling with the slightest 

 movement of the air. See p. 264. 



JtJt Venation pinnate-looped and reticu- 

 late, not pseudo-palmate; prominent 

 below and the leaf rugose. Teetfy 

 small, crenate-serrate. Shoots nodose. 



-r Shoots pubescent, but not velvety or 

 tomentose; buds glabrous. 



8 Leaves usually at least 6 cm. long, 

 more or less ovate, and glabrous 

 above. 



Salix Caprea, L. Goat Willow, Sallow (Fig. 91). 

 Shrub with grey or silvery shoots and foliage. Leaves 

 broad, elliptic to rounded ovate, or oblong ; or more or less 

 rounded oblong to oblong-obovate or oblong-lanceolate, 

 6 9 cm. (3 7 x 2 5 cm., or even up to 1014 x 6 10 

 cm.) long. Obtuse or acute, or acuminate with slightly 

 oblique point, and may be slightly cordate or attenuate 

 below. Margin crenate, or almost entire, more or less 

 undulate and recurved. Young leaves silky-velvety, be- 



