428 FLORA NIGRITIANA. 
Species quoad habitum inflorescentiam ‘involucrum et pappi 
colorem simillima V. extense et V. grandi, DC., et V. Sene- 
galensi, Less. A priori differt foliis margine integerrimis v. 
vix crispulis nec serratis et capitulis minoribus; involucra 
nempe vix 2 lin. nec 3} lin. longa, squamis minus inzquali- 
bus. A V. Senegalensi distinguitur pappi exterioris brevitie 
et acheniis pubescentibus. Frutex est, teste Vogelio, 6-8 
pedalis, floribus albis. Pappus rufescens, involucro duplo 
longior. 
6. Vernonia Senegalensis, Less., Linnea 4. p. 265.— Decaneu- 
rum Senegalense, DC. Prod. 5. p. 68.—Annabon Island, 
south of the Line, Curror; Senegal and Guinea. : 
In this species, the external pappus is much longer than in 
any of the preceding, but considerably shorter than the inner 
one. In the V. amygdalina, Delile, (Decaneurum, DC.) from 
Senegal and Nubia, which differs from the present species 
chiefly in the hispid achenia, the external pappus is also still 
longer; but even in that species there is a very perceptible 
difference in the length of the two series. In the Gymnanthe- 
mum Abyssinicum, Schultz Bip. (at least in my specimen, Un. 
Itin. 1st. Ser. n. 31), which has the habit of the foregoing, and 
which ought, with them, to be referred to Vernonia, the external 
pappus is, as in most Vernonie, scarcely more than a fourth of 
the length of the inner one, but so very deciduous, that if the 
head of flowers is not opened with care, the external setze ) 
only be found loose amongst the others. All these species, 
moreover, are so closely allied in habit to V. extensa and some 
other species of the Old World, that they cannot well be 
generically separated, especially as they have not the involueral 
characters ascribed by De Candolle to Decaneurum. In all, the 
setæ of the pappus are denticulate, and of a more or less ruddy 
colour. To the same set of Vernonia belongs probably the 
Candidia Senegalensis, Ten. Cat. Ort. Nap. p. 79, which 1 
unknown to me. 
The other West African Vernonie are V. pandurata, Link, 
from Congo, and V. pauciflora, Less., from Senegal; besides 
two species of Webbia: WW. serratuloides, DC., from Senegambia, 
