EXPLANATION OF PLATES 



Plate XI— 



Fig. 1 — Longitudinal section through an immature flower cut slightly ob- 

 liquely in the adaxial-abaxial plane. The tip of the stigma lies 

 below the upper ends of the anthers, and the style at this stage 

 is straight. 



Fig. 2 — Upper portion of an older flower cut in the same general direction 

 as in Fig. 1. The stigma has been shoved up into the upper end 

 of the flower in contact with the tips of the anthers, where the 

 stigmatic hairs touch the pollen grains through the breaks in the 

 stamens. Pollen tubes are passing from anther into the stylar 

 chambers. The style is beginning to fold through its excessive 

 elongation. 



Fig. 3 — Transverse section through a nearly mature flower cut at the level 

 of the anthers. The central style is surrounded on three sides by 

 the stamens. The inner investment consists of the perianth lobes ; 

 the outer is the spathe. 



Fig. 4 — General drawing showing the relations of the upper end of the 

 style to the anthers. The abaxial stamen is shown in face view 

 and the ruptures in its walls may be seen on either side. The 

 lateral stamens are shown in outline only. Stigmatic hairs at end 

 of style. 



57 



