72 MINNESOTA STUDIES IN PLANT SCIENCE 



Plate I 



A, B, section Hydatica. A, capsule in the subsection Rotundifoliatae ; B, follicles 

 in the subsection Cuneifoliatae; a, b, young stages of A; c, young stages of B; g\, 

 gland; A, d, e, types of hairs in the section Hydatica; C, follicles of the section Cal- 

 thophyllutn; j, young stage of same ; gl, gland ; g, type of hair in Caltkophyllum; D, 

 capsule of the section Aulaxis; h, types of hairs in Aulaxis; k, young stage of pistil 

 of Aulaxis; gl, gland ; E, type of carpels in the section Dertnasea; i, j, young stages of 

 the same; gl, gland; I, type of hair in the section Dermasea. 



