W. Bateson and a. E. Gairdner 275 



EXPLANATION OF PLATE XXVI. 



Fig. 1. A row of male-sterile plants (left) growing beside a row of normal plants (right). 

 Figs. 2 — 8. Drawings of flowers with petals and sepals removed ; Figs. 2 — 4 and 6 from 



blue-flowered plants ; Figs. 5, 7 and 8 from whites. 

 Fig. 2. Normal just before opening. 

 Fig. 3. Same later, anthers dropped. 

 Fig. 4. Male sterile, unopened flower, the usual condition. 

 Fig. 5. Barer condition of male-sterile, unopened flower. Stamens more developed, 



occasionally bearing some pollen. 

 Figs. 6 — 8. Later stages of male-steriles. Anthers shrivelled but persisting. 



