

THE DEHISCENCE OF ANTHERS BY APICAL PORES. 203 



genera, Mendoncia and JPseudocalyx, the same condition 

 prevails with a less widely open corolla tube and more 

 elongate anthers. Data are too limited to justify specula- 

 tion, but the association of a tubular corolla with apically 

 dehiscent anthers of the form so generally found when the 

 corolla is patent, is interesting. The inclusion of a linear 

 anther in a cylindrical corolla tube is nothing out of the 

 ordinary, but the cases detailed above are the only ones in 

 which the dehiscence is by pores. The condition described 

 in certain aberrant Elaeocarpaceae and Ochnaceae will be 

 recalled in this connection. 



In contrast with the preceding family, the Eubiaceae has 

 many genera and species in which the corolla is more or 

 less widely open and several in which it may be character- 

 ized as patent. Attention has already been called to some 

 of these in the section devoted to the Solanum-Cassia type. 

 Here we are concerned with only two genera. 



The anthers of Tresenthera 



species, 1 in Venezuela, 



the other in the West Indies), somewhat exserted from the 

 campanulate corolla, are rather unique in their form and 

 mode of dehiscence, opening as they do by a triangular 

 valve below the tip. In Rustia (5 species ranging from 

 Central America to beyond the province of Bio de Janeiro 

 in Brazil) the linear basifixed anthers are of the form so 

 generally found in apically dehiscent genera. In some 

 species the anthers are included in the tubular portion of 

 the corolla while in others they are exserted their entire 

 length from the throat while the rather large lobes of the 

 limb are patent. The occurrence of linear anthers in this 

 genus is not so worthy of comment as in Mendoncia, 

 jPseudocalyx, and Hiernia of the Acanthaceae, where the 

 anthers are generally very short, for in the Rubiaceae the 

 anthers are frequently linear in form and included in the 



corolla tube. 



Too much significance must not be attached to the con- 

 dition found in these genera, but it is suggestive when 





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