1917] MARKLE—ROOT SYSTEMS 197 
formed by vegetative multiplication. The root system consists 
of a thick, branched, horizontal portion bearing numerous laterals 
quite uniformly about 3 mm. in diameter. Those measured showed 
lengths of 5,6, 7, and 24in. The main root is usually about 2 in. 
in diameter and very succulent. It evidently functions as a- 
storage organ. 
