66 SPRING FLOWERS. 



P. tremula : tree ; leaves deciduous, orbicular or rhom- 

 boidal, smooth on both sides, irregularly and rather coarsely- 

 toothed, with slender stalks which twist readily, so as to keep 

 the leaves in motion ; catkins small. — Aspen. — Woods. Fl. 

 March, April. 



P. nigra : tree ; leaves deciduous, triangular-ovate, taper- 

 ing at the point, serrated, smooth on both sides ; catkins two 

 inches long, lax, cylindrical. — Damp places. Fl. March. 



(85) Fagus. Beech. 



F. sylvatica : tree ; leaves deciduous, ovate, obscurely 

 toothed, silky when young, afterwards glabrous; male cat- 

 kins globular on pendulous stalks, females erect globular 

 softly hairy. — Woods. — PI. April, May. 



(86) Quercus. Oak. 



Q. Robur : tree ; leaves deciduous, cuneately oblong, irre- 

 gularly sinuated or almost pinnatifid, sessile or shortly stalked ; 

 fruits clustered above the middle of a long peduncle (2-6 

 inches long) . — Woods and hedges. Fl. April. 



Q. sessiliflora : tree ; leaves deciduous, cuneately-oblong, 

 irregularly sinuated, stalked, the stalks |-1 inch long ; fruits 

 solitary or clustered, sessile on the branch, or seated on a 

 short peduncle (rarely 1 inch long). — Woods. Fl. April. 



(87) Corylus. Hazel. 



C. Avellana : shrub or small tree ; leaves deciduous, round- 

 ish heart-shaped, pointed, obscurely lobed, doubly coarse tooth- 

 ed ; male catkins long drooping cylindrical ; females resem- 

 bling ovate leaf-buds, with a few crimson threads. — Nut, or 

 Hazel-nut. — Coppices and thickets. Fl. April. 



