10 ASCENDING PART. HERBAGE. 



35. Their insertion is either sessile or stalked ; pel- 

 tate, clasping-, connate, perfoliate, sheathing-, equi- 

 tant, or decurrent. 



36. Their form is simple, or compound in various de- 

 grees ; undivided, or lobed; their outline very va- 

 rious in different plants; sometimes different on the 

 same individual. The. lower leaves of water plants, 

 the upper of mountain ones, have commonly the 

 greatest tendency to be much divided. For their 

 particular forms see Introduction to Botany. 



37. Fotiola, Leaflets, are the partial leaves, which, 

 connected by one common, simple or branched, 

 footstalk (23), make a compound leaf. 



38. The margin of Leaves or Leaflets is either entire, 

 wavy, serrated, jagged, toothed or notched, in a 

 simple or compound manner ; naked, fringed, 

 spinous, cartilaginous, glandular ; flat, revolute 

 (rolled backward), or involute (the reverse). 



39. Their surface is smooth, naked, glaucous, downy, 

 hairy, woolly, warty, glandular, or prickly ; even, 

 rugged, or blistery ; veiny, ribbed, or veinless ; co- 

 loured, variegated, opaque, or polished. Their 

 ribs and veins contain the principal sap-vessels. 



40. Some Leaves are fleshy, cylindrical, semicylin- 

 drical, awl-shaped, tumid, channelled, keeled, 

 two-edged, hatchet-shaped, solid, or hollow. 



41. Others are membranous, leathery, rigid, or al- 

 most woody. 



42. The termination of Leaves is either obtuse, acute, 



