NEW AFRICAN ASCLEPIADS. 99 



5-lobatum excedente ; poiliniis oblongis caudiculis brevibus fili- 

 formibus. 



Hab. Huilla. " In pascuis parce dumetosis prope Lopollo 

 sporadica," Dec. 1859, Welwitsch, no. 4173. 



The fleshy tapering tuber is nearly 3 in. long, the rest of the 

 plant about 3| in., with a hemispherical general outline. The 

 radiating branches (l^-lf in. long) are well clothed with narrow 

 spreading leaves 1^-2 in. long. The peduncles are h in. long, 

 the umbels about 7-flowered, the pedicels 1 line long. The 

 calyx-segments are f line long, the corolla-lobes 1 line by ^ line 

 broad, the corona-scales ^ line long, a little shorter than the 

 anthers. 



Near two South African species S. orhlculare Schltr. and 8. um- 

 beJluli/cruiii Schltr., which, however, are at once distinguished by 

 their ligulate corona-scales. 



Cynanchum Welwitschii, sp. nov. " Herba glauco-viridis 

 volubilis, late scandens, lactiflua, foliis carnosulis, mox flaccidis, 

 supra laste viridibus, subtus pallidus," cordatis, apiculatis, venis 

 venulisque sparse pilosis, laminis petiola duplo superantibus ; in- 

 florescentia corymbosa axillare, ramis florumque pedicellis sub- 

 umbellatis; calycis segmeutis ovato-lanceolatis ; ciliolatis, corolhe 

 tubo brevissimo, lobis lanceolatis superne falcatis obtusis, e Wel- 

 witsch sordide violaceis ; corona basi tubuliforme in caudas 5 

 subulatas flexuosas utrinque crenula parva sufifultas elongata ; 

 antheris breviter sagittatis, appendice rotunda terminatis ; poiliniis 

 oblongis, caudiculis brevissimis ; stigmate subrotundo ; folliculis 

 solitariis, conico-pyramidatis, angulo 1 obtusissimo, binis acutis ; 

 seminibus brunneis late ovalibus, complanatis, alatis. 



Hab. Golungo Alto. " Ad dumeta in Sobato de Mussengue, ast 

 nonfrequens; socialiscum Tragia. Ad fin. Novbr. 1855," Welwitsch, 

 no. 4222 & no. 4200. Kampala, Jan. 1894, G. F. Scott Elliot, 

 no. 7294. 



The slender striate stem bears a sparse pale ferruginous pubes- 

 cence. The leaf-blades are 1|-3|- in. long by 1-2^ in. broad, the 

 petioles 1-1|^ in. The peduncle of inflorescence is from 1 to 2 in. 

 long, the puberulous pedicels about 1 in. The calyx-segments are 

 IJ lines long, the corolla-lobes 3^ by 1^ lines, the corona-tube 1^ 

 lines, the long tails 1^ lines ; on each side of the latter is a minute 

 crenation. The short broad filaments are attached at the base to 

 the corona-tube ; the whole stamen is 1 line long. The narrow 

 fruit is a little over 3 in. long, less than ^ in. broad. The flattened 

 seed is 2^ lines long by If broad, and crowned with a white silky 

 tuft of hairs | in. long. 



This plant was included in the list of Mr. Scott Elliot's African 

 Asclepiads (see Joum. Bot. 1895, 337) as C. mossavihicense K. Sch.? 

 After seeing Schumann's type at Berlin, Mr. Schlechter is con- 

 vinced that we are dealing with a dift'erent species. 



The nearest ally of ('. Welwitschii is C. Holstii K. Sch., from 

 which, however, it diflers in its corona, its falcate petals, and 

 broader sepals, as well as in leaf-characters. 



H 2 



