iQib] 



de vries— dimorphic mu ta n ts 



253 



Fig, 2. — Ocnolhcra Lamarckiana mut. cana: flowering spikes of tiie two types 

 into which each generation spUts; on the left the Lamarckiana type, on the right the 

 parental type, showing the thin buds and the bent tips of the calyx; the difference 

 in height of the 2 spikes is the same as the mean difference in height of the 2 groups 

 on the bed; third generation of mut. cana no. 3, photographed July 22, 1914. 



