LEGUMINOS.E 



17i 



semi-sagittate stipules appears to depend on the form 

 of the stem and the arrangement of the bud. Where 

 the stem is winged the outer barb of the stipule would 

 be exposed. In such cases the stipule is semi-sagittate. 

 In the Garden Pea [Lathyrus sativus, Fig. 120) the 

 stipules are not only large in bud, and in arrangement 

 resemble those of L. maritimus, but they continue to 

 grow, reaching a length of fully 3 inches, and 1|- in 

 breadth, and act as a pair of leaflets, which they con- 

 siderably exceed in size. 



L. sativus. — A hardy climbing annual, a native 

 of Southern Europe, cultivated in Britain. The large 

 standard as described by Kirchner^ has at the base 



Fig. 120. — Stipules of Lathyrus sativus. A, before the unfolding of the leaf in 

 the natural po.sition ; B, with one stipule turned back to show the leaf and 

 shoot inside. 



two deep folds at right angles to one another, which 

 fit into corresponding depressions of the wing, and 

 thus lock the two closely together. The front edge 

 of the keel is strengthened by a wing -like process, 

 which is bent somewhat into the form of an S, so 

 that the point turns a little to the left. The keel, 

 it will be remembered, consists of two leaves, and 

 the point of the right one is arched outwards, while 



^ Quoted by Kiiuth. 



