FLORA NIGRITIANA; 425 
The list of Rubiaceae known from West Tropical Africa will 
be completed with two species, one gathered by Vogel in Fer- 
nando Po, the other by Don in Sierra Leone, the specimens of 
which are insufficient even to guess at their genus, and three 
published plants of doubtful affinity: Stipularia Africana, Pal. 
de Beauv., from the River Galbar, Hylacium Owariense, Pal. 
de Beauv., from Oware, and Benzonia corymbosa, Schum, et 
Thonn., from Guinea. 
LXV. Cowrosrrx. ` 
l. Oiospermum Nigritanum, Benth. ; caule puberulo, foliis bre- 
vissime petiolatis ovali-oblongis basi angustatis subtus pu- 
bescentibus, capitulis nudis, corolla glabra achenio oblongo 
longiore.—On the Quorra, at Patteh, Vogel. 
Herba O. Wightiane habitu subsimilis, sed minus villosa. Folia 
2-3-pollicaria, rugosula, remote subdentata, supra fere glabra, 
subtus presertim ad venas pubescentia. Jnflorescentia et 
capitula O. Wightiane, hee vero bracteis foliaceis destituta, 
alia terminalia, alia pauca lateralia subsessilia v. pedunculata. 
Involucri squam:e multiseriales, acutissime, margine sca- 
riosæ, dorso puberule, exteriores minores anguste, interiores 
9-4 lin. longz, flores sub:equantes. Receptaculum planum 
nudum. Flores numerosi. Corolle tubus tenuis, superne 
ampliatus. Styli rami subulati, acuti, recurvi. Achenium 
oblongum, 10-costatum, inter costas minute glandulosum, 
apice truncatum, omnino nudum. 
x Sparganophora Vaillantii, Gertn. DC. Prod. 5. p. 12.— 
8. Africanus, Gerta. DC. 1. c.—St. Thomas, Don.—Senegal 
to Benin, and common in Tropical America. : 
After a careful comparison of several African with American 
specimens, I cannot discover the slightest difference. Both 
vary in the blunter or sharper teeth of the leaves, and both are 
Sometimes smooth, though generally more or less pubescent. 
The Ethulia conyzoides, Linn., a common East Indian weed, 
extends through Africa to Senegal. 
l. Herderia stellulifera, Benth.; decumbens, ramus laxe co- 
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