ASPEN 265 



angles, and on shorter petioles. The larger leaves nearer 

 the apex. Obtuse to acuminate, strongly sinuate-dentate, 

 with blunt broad teeth, or more or less obtusely-serrate or 

 crenate-serrate, with incurved teeth. The smaller ordinary 

 leaves softly pubescent beneath and on the veins above 

 when young, and the petiole grey-tomentose ; becoming 

 glabrous and matt green above, with yellowish venation, 

 and nearly white or glaucous beneath with prominent 

 venation. The larger leaves grey velvety beneath, and 

 sometimes above also. Petioles very slender and com- 

 pressed, rarely glandular above, glabrous. Suckers and 

 young shoots pubescent. Buds viscid. The cordate leaves 

 of long shoots may be nearly entire. Autumn leaves yellow 

 and brown, often passing through brilliant chrome yellow, 

 orange to purplish scarlet or crimson hues, to red-brown. 



Venation pinnate and pseudo-palmate, the two lowest 

 secondaries (basal ribs) leave the midrib at the junction of 

 the petiole, and extend radially right and left, the midrib 

 then giving off pinnate secondaries further up. Basal 

 ribs, like the other secondaries, somewhat feebler than the 

 midrib ; they and their outer tertiaries converging slightly 

 upwards, the latter almost perpendicular to the midrib in 

 general direction. Tertiaries predominantly anastomosed 

 into small but well-developed rather rounded meshes ; 

 secondaries distinctly sinuate. Reticulation prominent. 



Venation pinnate-looped or reticulate. 

 Buds not viscous. 



Leaf-insertion narrow and rounded; 

 leaf-scar elliptic, extending not more 

 than J way round the shoot. 



jf Shoots spinescent with true thorns, 

 more or less pubescent. Petioles e- 

 glandular: stipules linear and per- 

 sistent. Leaves convolute. 



