76 MINNESOTA STUDIES IN PLANT SCIENCE 



Plate III 



Ventral aspects of the carpels of the sections in which the receptacle is more or 

 less adnate to the ovary (in all cases the gland is shaded black) : section Micranthes: 



I, S. californica; 2, 5". fragosa; 3, S. pennsylvanica ; 4, S. montanensis; r-4', carpels 

 of the same seen from above, showing nature of the gland in each ; section Chiono- 

 pkila; 5, 5". rhomboidea; 5', young stage of same seen from above, showing gland; 

 X, point of connection of carpels; section Tricarpum: 6, S. texana; 6', young stage of 

 same seen from above; x, line of connection of carpels (shaded in line); section 

 Derma^ea: 7, young stage of carpel of 5". caroliniana; 8, 8', old and young stages of 

 carpels of S. rufidula; 9, 9', the same of 5". occidentalis; 10, carpel of S. idahoensis; 



II, 11', early stages of carpels of S. virginiensis. Figures 7 and 11 also show the 

 variations in the depth of the receptacle in species of the section Dermasea. 



