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, c. 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 



Fig. 44. Pinnately 

 netted-veined leaf of 

 rose. (Ada Hay- 

 den.) 



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 ; 

 oblanceolate, like a lanceolate leaf, but 

 the apex wider than the base ; spatu- 

 late, shaped like a spatula, apex 

 rounded; obovate, like an ovate leaf, 

 but the apex wider than base ; cuneatc, 



Fig. 45. Parts of 

 a leaf; s, stipules; 

 p, petiole; b, blade. 



