VEGETABLE ORGANOGRAPHY. 



phenomenon takes place in certain species of AspalatJms 

 and in Pinus, where the sheath represents the leaf, and 

 the two, three, or five leaves which it contains are the 

 first of an abortive branch. The Cedar and Larch show 

 that fasciculate leaves are only those of a branch, very 

 near together ; for in the spring they are fasciculate, and 

 when the axillary branches have had time to elongate 

 during the summer, the leaves become alternate. The 

 Asparagi owe to an analogous cause their bundles of 

 axillary leaves, from the axil of a scale which is the 

 rudiment of the true leaf. 



Thus, leaves said to be fasciculate do not constitute 

 a primitive disposition, but are combinations, of which 

 all the systems of leaves can be susceptible. 



Section VIII. 

 Of Stipules. 



The name of Stipules (stipulcc) is given to little 

 foliaceous organs, situated on both sides of the base of 

 leaves. 



Stipules do not exist in Monocotyledonous plants, 

 or in any Dicotyledon which has a sheathing petiole ; 

 among Dicotyledons with leaves which do not sheath, 

 they are also very frequently absent, especially in those 

 with opposite leaves. Their existence however appears 

 to be intimately connected with the general s3Tnmetry 

 of plants, for they exist or are absent in all the species 

 of a family ; thus, stipules are found in the Rubiaceae, 

 Malvaceae, Amentaceae, Leguminosse, Rosaceoe, &c., 



