482 



CONSERVATIVE ORGANS. 



[LECT. ix. 



Buck-bean, Menyanthes trifoliata, of Horse Ches- 

 nut, <#sculus, the Vetch tribe, Vicia, &c. 



A. SIMPLE LEAVES (Folia simplicia) differ in 

 respect of general Jigure ; form or solid configu- 

 ration ; apex; base; margin; surf ace ; and sub- 

 stance. 



a. The general Jigure or superficial aspect of 

 a leaf is derived from the line which circumscribes 

 its flat surface, or which is described by its mar- 

 gin. In demonstrating the diversities which it 

 displays, I shall begin with the simplest and pass 

 progressively to the more complex. A leaf is termed 

 Capillary (folium capillare), a. } when it is long, 

 fine, and flexible, resembling a hair. Linear 

 ( linear e), b., when it is long, about a geome- 



trical line in breadth, and the sides parallel, or 

 is the same breadth near the apex as at the 

 base. Gramineous or riband-like (fasciarium), c. y 

 when it resembles the linear, with which it is 

 sometimes confounded, but from which it differs in 

 being broader and not parallel towards the apex. 

 Needle-shaped (acerosum *), d., when, resembling 



* " Acerosum est lineare persistens : ut in Pino, Abiete, 

 " Junipero, Taxo.'* Phil. Bot. Notwithstanding this high au- 



