232 



APPENDIX. 



Mexican and Central-American Genera and Species inhabiting Africa &c. 



Orders. 



Genera and Species. 



Distribution. 





Scleria hirtella 



Trop. Africa. 



Trop. and S. Africa. 



S. Africa. 



Trop. Africa, Masearene I. 



J1 If ft ^ t) 



One species trop. Africa. 

 Trop. and S. Africa. 

 One species S. Africa. 

 Africa, Madagascar. 

 S. Africa. 



GramineaB 



Carex glomerata 



Paspalum compressum .... 

 „ paniculatnm .... 





Anthephora 



Trachypogon 



Ctenium 



Chloris petrsea 





The genera in this Table belong to two categories, namely such as are represented in 

 both countries by the same species, and such as are represented in the two countries by 

 different species. They may be further classified into those represented by a single 

 species in the one country and by several in the other ; some having their headquarters 

 in America, others in Africa. Where no specific name is given different species inhabit 

 the two countries ; and where the number of species is limited to one, it is indicated. 

 In many instances where the species are the same there are strong grounds for suspecting 

 an American origin of no very remote period ; this is especially the case with the 

 Leguminosae, the seeds of which mostly bear long immersion in salt water without 

 injury, and may have been carried across by ocean-currents. Others have probably 

 been conveyed in ballast, or otherwise introduced through human agency. Again, there 

 are others whose existence in Africa or Madagascar must date from remote times, and 

 perhaps be regarded as instances of affinities in the botany of the two regions parallel 

 to those pointed out by Wallace and others as existing in the animal kingdom. Several 

 striking additions might be made to the foregoing Table, if we included such as are 

 common to the African region and the West Indies or South America. 



The total number of genera enumerated is ninety-six, whereof fifty-six are represented 

 by different species in the two regions, and thirty-nine by the same species. Such of 

 the genera as are given a separate line, followed by a species of the same genus in the 

 next line, are restricted to America and Africa, and, added to the fifty-six represented 

 by different species, make a total of sixty-nine genera common to the two countries, 

 but not known to inhabit any other part of the world. Such genera as are followed 

 by a specific name in the same line have a wider range. 



