Poly gala polygama and P. paiiciflora. 147 



CON'CLUSIONS. 



1. Polygala polygama develops, in addition to the evident 

 and the subterranean types of flower described in the manuals, 

 a third type — the aerial cleistogamic — which may be found 

 abundantly in midsummer. 



The last are morphologically intermediate between the 

 former two types and with occasional transitional forms, fur- 

 nish a connected series between the conspicuous and subter- 

 ranean flowers. 



The shoots bearing aerial cleistogamic blooms are more 

 or less geotropic. 



2. The chasmogamic flowers very largely fail to mature 

 seed. The cleistogamic ones produce seed abundantly. 



3. The five sepals are present in all types of flower. Only 

 one petal (the anterior) is found in the subterranean flowers, 

 and the same, with rudiments of two others (the posterior) 

 appear in the aerial cleistogamic. Eight stamens are generally 

 present in the aerial cleistogamic, but more or less reduced, 

 and in the subterranean blooms from three to seven are found, 

 still more reduced, sometimes but tw^o bearing perfect micro- 

 spores. The pistil of the subterranean flowers is greatly 

 reduced ; that of the aerial cleistogamic shows a condition 

 intermediate between the former, and that of the chasmogamic 

 flower. A well-developed receptacular nectary exists in the 

 chasmogamic flower. Only traces of this are present in the 

 aerial cleistogamic, and it is entirely wanting in the subter- 

 ranean form. 



4. Stomata are present on all parts of the evident calyx, 

 irrespective of color. They are found in extreme abundance 

 on the outer surface of the sepals in the aerial cleistogamic, 

 and are found also on the calyx of the subterranean flowers, 

 but in a rudimentary condition. 



