134 



PLANT PHYSIOLOGY AND ECOLOGY 



accordingly. This work may well be combined ^ath the study of dis- 

 semination and migration indicated on a later page. 



Fig. 38. Umbels of a wild onion, Allium, recurvatum. The buds and 

 flowers droop, but the pedicels begin to curve upward after fertiliza- 

 tion, and the capsules become erect. 



Grow plants of Campanula rotundifolia or Chamcenerium angusti- 

 folium. Trace in detail the movements of flower and capsule, and 

 sketch the characteristic positions. 



