280 ON PECULIARITIES OF AFRICAN RUBIACE^. 



The Indian species, Ixora coccinea, which is often cultivated, 

 has been sent to the British Museum hj the Eev. A. Eobb from 

 Old Calabar, without any note stating that it was cultivated there 

 or had been introduced into Africa. 



6. Tropical America. 



Oldenlandia corymbosa ... Widely spread. 



Geophila reniformis ? Widely spread. 



Diodia arenosa ? Brazil . 



D. maritima Cuba, Guatemala, &c. 



D. breviseta West Indies, Guyana, and 



Panama, 



Spermacoce raraisparsa Brazil. 



Eichardia scabra AVidely spread. 



w 



Of the 482 species which have been described in the third 

 volume of * The Flora of Tropical Africa ' or added in these notes, 

 250 are new or not previously described ; and of the 81 genera 

 amongst which the species are distributed, 3 genera are new. 



«. 



DESCRIPTION OF THE PLATES. 



Plate VII. 



Penfas parvifoHa, Hiem. 

 Fig. 1. An expanded flower, enlarged two diameters. 



2. Corolla, laid open, showing the interior with the included stamens. 



3. Diagram showing the valvate sestivation of the corolla. 



4. Vertical section of the pistil and calyx, enlarged five diameters. 



5. Horizontal section of the ovary, enlarged also five diameters. 



Plate VIII. 



f - 



TricJwstachys vaginalis, Hiem, 

 Fig. 1 . A flower-bud, enlarged four diameters. 



2. Diagram showing the induplicate-valvate aestivation of the corolla. 



3. An expanded flower, enlarged four diameters. 



4. CoroUa laid open, with yertical section of the ovary, enlarged also four 



diameters. 



5. Stamens, front and side views, enlarged eight diameters. 



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