258 EARED WILLOW: ALDER 



than in S. Caprea, 3 4 cm. long (2 7 x 1 3 cm.) ; and 

 obovate or oblong-obovate, but may be oblong to sub- 

 rotund; cuneiform below, acute, obliquely cuspidate or 

 obtuse. Edges slightly revolute, wavy, toothed, crenate or 

 nearly entire. Dull grey green and downy above, and 

 much wrinkled; grey or bluish tomentose, and strongly 

 yellowish reticulate beneath. Petiole 4 8 mm. long, sub- 

 tomentose. Stipules large, half-cordate, often toothed, 

 and persistent. Buds smooth. Autumn leaves yellow. 



Venation like that of S. Caprea, but leaves more 

 obovate. There are no stomata above. 



tt Leaves not tomentose or velvety hoary 

 beneath ; glabrescent or glabrous. 



Venation strict-pinnate, the secondaries 

 running straight to the teeth of the bi- 

 serrate margin. Leaves broad, more or 

 less glandular viscid, and buds resinous 

 or viscid. 



l~l Leaf deep green, broadly obovate ; 

 secondary ribs 6 8 pairs, the lower 

 the shortest. 



Alnus glutinosa, Gaertn. Alder (Fig. 93). Medium 

 tree with trigonal shoots, stalked buds, and dark shining 

 foliage in i spiral. Leaf about 4 9 x 3 7 cm. (4 10 x 

 3 9), rounded, broadly obovate, or nearly obcordate, to 

 orbicular-cuneate, ovate-elliptic or sub-orbicular; obtuse, 

 truncate, or slightly retuse at apex, and with cuneiform 

 base ; irregularly sinuous or slightly lobed and bi-serrate 

 or dentate, or nearly entire below. Glabrous and deep 

 shining green above, and more or less viscous, hardly paler, 

 finely glandular beneath, and with tufts of rusty hairs on 

 the midrib and in the axils of the veins. Petiole rather 

 short, 1 2 cm., pubescent. Stipules conspicuous, blunt, 



