200 MISSOURI BOTANICAL GARDEN 



161 genera of tropical and subtropical distribution, 98 

 occurring in South America, 31 in the Indian region, 19 

 in the tropical African region and the others of various 

 distribution. 



Outside of this family I have assigned only three genera 

 to this type : Storckiella of the Leguminosae, and Max- 

 imilianea and Amoreuxia of the Bixaceae. Possibly some 

 others, as, for instance, Cheiranthera of the Pittosporaccae 

 and Exacum of the Gentianaceae should also have been 

 placed here instead of in the Solanuin-Cassia type. 



Storckiella (2 species in Oceanica) is the only member 

 of the apically dehiscent Cassieae not clearly belonging in 

 the Solanum-Cassia type. It is the only form with long 

 filaments and it seems best for this reason to separate it 

 from the genera to which it is systematically related. 



In the Bixaceae, Bixa has been treated under the Dillen- 

 iaceous type. Maximilianea (13 species, 6 in tropical 

 Amerjca, 3 in Africa, 1 in tropical Africa and southern 

 Asia, 3 in North Australia and Queensland) with large 

 actinomorphic flowers, and Amoreuxia (3 species in Central 

 America) with zygomorphic flowers, have long filaments 

 and rather elongate anthers which open by well-formed 

 terminal pores. These forms should possibly have been 

 placed in the Dilleniaceous type too, but the form of the 

 stamens is very suggestive of the Melastomataceous type 

 so they have been placed here. 



ABERRANT FORMS. 



As mentioned above, a few genera in which the anthers 

 have been described as opening by pores do not fall readily 

 into any of the above types. The fact that the most of 

 the forms described as apically dehiscent belong clearly to 

 one of these categories has led me to designate these simply 

 as aberrant forms. Here as elsewhere classification should 

 not be too much influenced by the number of individuals or 

 named groups of individuals which may be assigned to any 



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