ASPEN 219 



bundles. For evergreen Oaks see pp. 148 and 149 : it 

 may be mentioned that the dead leaves of the ordinary 

 Oak may remain on through the winter in certain circum- 

 stances. 



[Prunus Avium has a decided tendency to aggregation 

 of the buds on the dwarf-shoots.] 



$$ Buds not specially aggregated at the 

 tips of the twigs, or if so only on the 

 dwarf-shoots. Scales not in 5 ranks. 



+ Buds viscid, more or less acute and 

 on prominent leaf -bases; twigs and 

 buds glabrous or nearly so. 



8 Buds slender, with sharp conical 

 points, the laterals appressed more 

 or less, not green, the two lower- 

 most bud-scales lateral to the 

 leaf -scar or partially fused ; pith 

 angular or 5 -rayed stellate ; twigs 

 slender and inclined to be angular 

 above, and to light colours e.g. 

 yellow-tawny or grey-brown. 



A Buds long ovoid-acute or nearly 

 acuminate, hardly appressed, 

 tips often incurved, shining pale 

 brown; twigs the same colour ', 

 rounded, and glabrous. 



Populus tremula, L. Aspen (Fig. 112). Buds small, 

 brown, and somewhat Elm-like, but the few scales, about 

 4, are not distichous, though they are ciliate and have 

 traces of pubescence. The lateral buds are erect, but 

 hardly appressed. Dwarf-shoots thin, very knotty, owing 

 to the projecting leaf-bases, and more or less shortly 

 pubescent. Twigs polished, rounded, yellowish brown 

 or tawny, passing to olive-grey or slate-coloured, with 

 scattered lenticels. Leaf-scar semi-lunate with 3 small 



