FERTILITY IN CICHORIUM INTYBUS 
377 
Fig. I. Typical plants of the variety red-leaved Treviso. The marker stan Js 
by self-fertile plant (R. Ser. lo, No. 8); all other plants in the view were self-sterile. 
From photograph taken in the afternoon when all flower heads are closed. 
involving duplication and cohesion of the main axis. Two main stems 
develop with a single root system. Occasionally these are separated 
