202 



MISSOURI BOTANICAL GARDEN. 



ban) is ins 

 mendoncia 



titly known to me. The anthers of Afro- 

 species in tropical Africa) are peculiar 



among those opening by apical pores. In Hiernia ( 



species in Ang 



ndoncia ( 



ical America), Monachochlamys (1 species in Madagascar) 

 and JPseudocalyx (1 species in Madagascar and Nossi Be 

 Island) the anthers are of the simple oblong to linear type 

 with the more or less shortened filament so characteristic 

 of the apically dehiscent anthers of most of the preceding 

 families. -Except in one or two of these six forms, how- 

 ever, dehiscence is not by the clearly-defined, round pores 

 found in so many of the genera described above, but by 

 more or less elongate apical slits. 



It is not necessary in this place to enter into a detailed 

 discussion of the structure of the stamens in the usually 

 strongly zygomorphic flowers of the Acanthaceae, but at- 

 tention may be called to the fact that the form of stamens 

 found in the four genera just mentioned is not at all coin- 

 in fact is almost unique, in this large family. In 

 almost all the forms discussed above, the linear anthers on 

 short filaments are exserted from a widely open corolla. 

 In the Acanthaceae the corolla is rarely open enough to 

 be designated as campanulate from the base and it is never 

 rotate. In Hiernia the limb is patent and the somewhat 

 declinate linear anthers exserted so that except for the con- 

 siderable length of the tube the habit of the flower is much 

 the same as if the anthers were inserted by short filaments 



mon 



on a rotate corolla. 



presence 



the long perianth 



tube alone prevents the placing of this interesting genus in 

 the Solanum-Cassia type. In Ophiorrhiziphyllon the two 

 fertile stamens with long filaments and short anthers are 

 described as much exserted from the zygomorphic corolla. 

 Afromendoncia has the tube somewhat expanded above 

 and the characteristic anthers project only slightly. In 

 Monachochlamys the corolla is tubular to campanulate, 

 with the stamens clearly included, while in the two other 



