The Dwarf Lima Beans. 



147 



beans, but I can find no evidence of hybridity, and. I bave no besita 

 tion in calling it a straigbtforward variety of Phaseolus rmdtijlorus. 

 But tlie most marked type of tbis bean wbich I know is tbe 

 Barteldes Busli Lima, wbicb is as completely busb form as tbe com- 

 mon field bean, and wbicb bas so far departed from tbe cbaracter of 



19.- 



• Fleshy or perennial root of Barteldes Bush Lima. 



its parent tbat it is almost or quite annual in tbe growtb of its root, 

 Tbe illustrations explain tbis curious evolution towards an annual 

 root. Fig. 18 sbows tbe root of a common busb bean (Sion House). 

 Tbe root lacks wbolly any tap root, and tbe fibres are bard and 

 woody and die completely wben tbe beans mature. Fig. 19 is a 

 root of one of tbe most perennial types of Barteldes Busb Lima, and 

 it sbows tbe flesby tap-rooted cbaracter of tbe root system. Tbis 



