336 



As the species was originally described by Moore from a single 

 specimen, which was not seen by Schinz, it has seemed advisable 

 to give a fresh diagnosis of the species from an examination of a 

 more complete series of specimens. 



Exochaenium, Griseb. in DG. Prodr. ix., 1845, 55 ; Schinz in 

 Bull. Herb. Boiss., ser. II., vi., 1906, 744. 



This genus is distinguished from Sebaea owing to the presence 

 of a ring of disk-scales between the calyx and the corolla. The 

 stamens are inserted in the corolla-tube. The style also does not 

 possess the biglandular swelling typical of Sebaea, and the stigma 

 is elongate-clavate. 



The genus includes 11 species in Tropical Africa, with one 

 species, E. grande, Griseb., in Natal, Orange River Colony and 

 Transvaal. 



Exochaenium was distinguished from Belmontia, E. Mey., by 

 Grisebach, owing to the character found fay him in the anthers :— 

 "Antherae erectae, loculorum pariete interna inter se connatae, 

 nma inde extrorsum aperta dehiscentes," v. Griseb., in DC. Prodr., 

 ix., 5o ; Benth. et Hook. Gen. Plant, ii., 804. As this observation 

 was not confirmed either by Welwitsch or by Bentham and Hooker, 

 the genus was not maintained in the Genera Plantarum. Grise- 

 bach s genus, as has been stated above, was made to receive the 

 single species Belmontia grandis, E. Mey., a heterostyled plant, 

 t seems clear that Grisebach must have examined only the long- 

 styled flower, in which the anthers are concrescent and extrorse 

 (v. ng. B 4), and that both Welwitsch and Bentham and Hooker 

 touncl only the short-styled Bowers in which the anthers are always 



Tuv \ 5* • ' '* The genus Ex ochaenium, however, is not re- 

 established in the Flora Gapensis on such slender grounds, since 

 tne concrescent extrorse anthers appear to occur in only about two 

 species of the genus. 



Exochaenium 



Herb 



7r. i • '/ ' m/ ' int0 two secti ons Euexochaenium and Pseudo- 

 tacfuademis. These divisions are useful, and, as I have included 

 certain species not given by Schinz, and excluded one species from 



llTT'/J ap ? end below a Iist of the s P eci ^ which I consider 

 belong to Exochaenium. 



Section Euexochaenium, Schinz. 



E. grande, Griseb. 



TTTI — 



W 



A 



lb. prtmulaejlorum, Welw. 

 E. zambesiacum, A. W Hill 

 E. debile, Welw. 



E. platypterum, Schinz. 

 E. pumilum, A. W. Hill. 



Section Pseudotachiadenus, Schinz. 

 E. cliionanthum, Schinz. 

 E. Baumiamun, Schinz." 

 E. gracile, Schinz. 

 E. Teuszii, Schinz. 



