322 Sc /lively — Contributions to the Life History of 



and thus these petals are held firmly together as described 

 by Miiller for other forms. On the superior margin of 

 the broad portion of each wing occurs a sack-like process 

 or short spur whose opening is upon the exterior. The 

 curious auricled appearance of the petal is due to the 

 presence of this contrivance. 



In the bud the vexillum encloses the remaining petals 

 almost completely, but, as the flower expands, it is pushed 

 posteriorly. This petal is obovate, tapering gradually ; there 

 is no true claw. It is marked transversely about half way 

 down, by an irregular, imperfectly^ semi-circular band of 

 deep purple hue, which may possibly be interpreted as a 

 "path-finder." The most deeply pointed portion of the 

 calyx is opposite the anterior petals (carina); the remaining 

 three are around the standard. 



The stamens are ten in number, five long, five short ; 

 they are diadelphous and the insertion is perigynous. The 

 staminal tube is united for three-fourths of its length ; the 

 superior stamen is free. The anthers are two-celled, small, 

 almost spherical, versatile and introrse ; they are of a 

 deep orange color, and well filled with pollen. In young 

 flower-buds, the anthers are found to be well-developed, 

 but the filaments are short ; for some time the style and 

 stigma extend for a distance above the stamens. 



Plate XXVII, Fig. 3, is a transverse section through a 

 bud, showing the anther lobes and a portion of the connec- 

 tives of the five shorter stamens, also filaments of the five 

 longer. 



In a transverse section of an anther belonging to a 

 purple flower, the following condition is seen : the epider- 

 mis (exothecium of authors) is a single row of small deli- 

 cate cells ; the hypodermal layer (endothecium of authors) 

 consists of much thickened, columnar cells. 



In developing anthers the pollen is normal. Some, per- 

 haps all, of the anthers dehisce when the bud is about one- 

 half inch long, and showing no indications of unfolding. 

 At that time the pollen is pale yellow, powdery, and under 



