1^4 MISSOURI BOTAXICAL GARDEN 



but for the present I have used the term iu the rather gen- 

 eral sense in which it is employed in descriptive botany. 



In this paper I have omitted all reference to the literature. 

 It is proper to state that I have examined all the most 



got 



cussed as well as the special literature of floral ecology. 

 These citations I hope to include with ample descriptions and 

 illustrations of all of the forms considered, in the final paper. 

 I have also sought to avoid all references to theoretical 

 considerations and to confine myself as strictly as possible 

 to the facts and the problem of grouping them in as logical 

 and significant a manner as possible. 





The Types of Apically Dehiscent Anthers 

 The classes recognized are the following : 



1. ARACEOUS TYPE. 



2. GRAMINEOUS TYPE. 



3. POLYGALACEOUS TYPE, 



4. ERICACEOUS TYPE. 



5. DILLENIACEOUS TYPE. 

 6- SOLANUM-CASSIA TYPE. 



7. MELASTOMATACEOUS TYPE. 



The first four are to be merely touched upon in the 

 present paper. The last three, on the other hand, are to 

 be considered in some detail ; they are characterized by 

 many similarities of structure and doubtless of ecological 

 relationship as well, and while, as it seems to me, they 

 are separated, on the whole, by sharp mean differences, 

 there is of ten difficulty in drawing the limits of the groups. 

 Since they are to be understood only when examined com- 



■ 



* Most of the titles to which reference has been made by the author's 

 name only in this essay, may be found in the bibliographies in the English 

 edition of Muller's Fertilisation of Flowers, the continuation of this list 

 from 1883 to 1889 published by MacLeod in the Botanisch Jaarboek. 2 : 

 195-254, 1890, or the more complete bibliography of Knuth's Handbuch 

 der Blutenbiolocie. 



