FLORA NIGRITIANA. 431 
brevissimis. Capitula quam in E. Canadensi paullo majora. 
Involucri squame inequales, pauciseriales, dorso virides pu- 
berule, margine sicez subscariose. Flores fæminei omnes 
pappo breviores, exteriores in ligulam angustissimam brevem 
produeti, interiores stylo suo dimidio breviores; masculi in 
medio capitulo vix deni, pappo suo sub:equales, basi tenues, 
superne incrassati, angulati, 5-fidi. Achenia compressa, 
glabra. Pappus tenuis rufescens. 
The Erigeron spathulatum, Schum. et Thonn., and E. ezsti- 
pulatum, Schum. et Thonn., both from Guinea, are unknown to 
me. The latter is most probably a Blumea. 
l. Microglossa petiolaris, DC. Prod. 5. p. 321.—Sierra Leone, 
Don ; Accra and Fernando Po, Vogel; Senegambia. 
The largest leaves are above three inches long and two broad. 
The Sierra Leone variety of M. volubilis mentioned by De 
Candolle is probably rather the present species, which has 
occasionally a slight tendency to climb, and is certainly in other 
respects very near to the true M. volubilis. The generic name 
has been altered to Frivaldia by Endlicher, on the plea of 
the pre-existence of a Microglossa among Birds: a circum- 
Stance not now generally considered as requirmg the change. 
The whole genus is, by Schultz Bipontinus, proposed to be 
United with Erigeron, and there is no doubt that the circum- 
Scription of Erigeron, Blumea, Pluchea and their allies requires 
Considerable modification; but the wholesale alterations pro- 
posed cannot be adopted until the characters of the new groups 
Shall have been given, and shown to have been verified on the 
very numerous species now known from both hemispheres. 
The Microtrichia Perrottetii, DC., is not in our collections. 
A Senegal plant in the Hookerian Herbarium, evidently a 
congener, does not precisely agree with De Candolle’s cha- 
racter, and probably forms a second species, and there is in the 
Same Senegambian collection a specimen of an apparently new 
8enus, allied to Pteronia and Chrysocoma. 
1. Spheranthus Senegalensis, DC. Prod. 5. p. 370.—Senegal 
and Sierra Leone, Don, and others. 
The Grangea ceruanoides, Cass., and G. procumbens, DC., 
