206 MISSOURI BOTANICAL GARDEN. 



by a large terminal gap which may hardly be appropriately 

 designated as a pore. These forms are evidently bee 

 flowers in which the essential organs are inclosed in a 

 ventral carina and this inclusion doubtless has a large 

 significance in the form and size of the opening of the 



anther. 



The Ericaceous type is one of the most important, but 

 demands for its adequate treatment much more space than 

 can be given to it in this place and many more data than 

 have so far been secured. The most conspicuous charac- 

 teristic of this type is the pendulous habit of the flower, 

 with tubular, urceolate or globose corolla. In this paper, 

 several forms which differ in the essential features from 

 the most prevalent characteristics of the typo as I have 

 limited it have been classed with this group largely on 

 account of their systematic affinities. The class as a 

 whole, however, may, I think, be regarded as a very 

 natural one. 



The opening of the anther in this type varies greatly in 

 form and size. The presence and form of the aristae on 

 the anthers in many genera also furnish interesting char- 

 acteristics and are of importance in the pollination of the 

 flowers. 



The Ericaceae are known to be largely dependent for 

 their fertilization upon Apidae, but the epitomizing of the 

 observations on the ecology or the geographical distribu- 

 tion of this large class lies outside the scope of the present 

 paper. 



The Dilleniaceous, Solanum-Cassia and Melastomataceous 

 types must be considered together. These types are not 

 so sharply separated as the preceding but in some degree 

 transgressivc. It is this general group of floral forms to 

 which the present paper is devoted. The others are con- 

 sidered only in such detail as will show their relations, or 

 rather the lack of any relation, to these types. 



It has been impracticable to give structural details in the 



