I2O 



WEEDS OF THE FARM AND GARDEN 



usually with its own stalklet, as in the rose. Compound 

 leaves are of two kinds: pinnately compound, in which 

 the leaflets are arranged on the sides of a main stalk, as 

 in rose and ash ; and palmately compound leaves, in which 

 the leaflets are borne on the end of a 

 leaf stalk, as in the horse-chestnut 

 and Virginia creeper. Clover has a 

 trifoliate compound leaf, e. g., a leaf 

 with three leaflets. Some leaves have 

 two leaflets, these are bifoliate. 

 Some leaves, like the honey locust, 

 are simply pinnate, but occasionally 

 on young shoots they are divided 

 again ; these, then, are twice pinnate. 

 The palmately compound leaves of 

 meadow rue are in threes or ternately 

 compound, or four times compound. 

 When a leaf is twice compound it is 

 biternate. 



There are many different forms of 



leaves, the more important being as 



follows : Linear, a narrow leaf much 



longer than broad, like blue grass; 



lanceolate, a leaf which is longer than 



broad, tapering toward the apex, outline 



lance-shaped ; oblong, when longer 



than broad ; elliptical, like an oblong 



leaf, but the ends of the same width ; 



ovate, longer than wide, the base 



wider than the end, like a hen's egg in 



outline ; orbicular, circular in outline ; 



oblanceolatc, like a lanceolate leaf, but 



the apex wider than the base ; spatu- 



late, shaped like a spatula, apex 



rounded; obovate, like an ovate leaf, a fcS ; 45 ;, 



but the apex wider than base; cuneate, /.petiole;' , blade. 



Fig. 44. Pinnately 

 netted-veined leaf of 

 rose. (Ada Hay- 

 den.) 



