
128 BOTANICAL GAZETTE [FEBRUARY 
water. Here it grows in colonies, following the lines of the depres- 
sions. The soil in such places is much finer and less pebbly than that 
on the slight elevations near by, but experiments in transplanting have 
demonstrated that this distribution is not due to soil characters. It 
seems probable that the fruits and joints are washed down by the 
stream, and settle at various places along the course. From the 
single plants so started colonies soon are formed, through the agency 
in part, it may be supposed, of root propagation and “layering.” — 
CaRLETON E. Preston, Harvard University. 
4 
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