VARIATION IX INDIGOFERA SUMATRANA, GAERTN. 



51 



height when fully grown ; but the tendency for the branches to lie in one 

 plane is absent. The intermediate character is further exemplified by the 

 period of flowering. 



It now becomes necessary to note the localities in which the above four 

 types are found, and the relative positions which these localities bear to 

 each other. 



The type which was first considered occurs in the following localities : 

 Dera Gazi Khan, MozufTergarh, Multan, Bahwalpur, and Hissar. With 

 the exception of the last, these all lie in the valley of the Indus, and the 



Fig. 8. — Multan Plant. 



area occupied by this type may therefore be conveniently termed the 

 Punjaub area. 



The second occurs at Delhi, Rhotak, Gurgaon, Kasganj, and Cawnpur. 

 All these, without exceptior, lie in the GaDges valley, and, adopting the 

 same terminology as before, the area occupied by them may be referred to 

 as the Ganges area. 



The first of the additional types occurs only at Sukkur in Scind — the 

 most westerly place in which I. sumatrana is cultivated ; the second only 

 at Jhind in the Eastern Punjaub. 



Hence it becomes evident that a series of gradations in the type of 

 plant is encountered as a passage is made along a V-shaped line running 



