568 FLORA NIGRITIANA. 
5. Eragrostis biformis, Kunth, Enum. 1. p. 832 ? (sub Poa).— 
On the Gambia, Don ; Cape Coast, Vogel. 
6. Eragrostis tremula, Lam.—Kunth, Enum. l.p. 832. (sub 
Poa).—On the Gambia and Sierra Leone, Don ; Bassa Cove, 
Ansell ; Nubia. 
7. Eragrostis, near to E. tremula, and perhaps a mere variety. 
—On the Quorra, Vogel, Ansell. : 
The determination of the five last Eragrostides 1s very 
uncertain, the species of this numerous genus are often dis- 
tinguished by slight, although constant characters, difficult to 
describe, and often not alluded to in descriptions, whilst the 
number of florets in each spicula, the most obvious character 
usually relied on, is sometimes very variable in the same species. 
Besides the above, there are six others described from the 
same region, viz: Poa squamata, Lam., from Sierra Leone ; 
P. Cambessediana, Kunth, from Senegal ; P. fascicularis, Trin., 
from Congo; and P. cachectica, Schum. et Thonn., P. Hip- 
puris, Schum. et Thonn., and Eragrostis Hornemanniana, 
N. ab E., from Guinea. 
1. Poa mucronata, Poir.—Kunth. Enum. 1. p. 884 ?—On the 
Nun River, Vogel. 
The specimens are young, but as far as they go they agree 
with Beauvois’ figure and description. Their appearance 1$ 
neither that of Eragrostis, nor of Poa proper, but rather of 
Centotheca, although the reflexed bristles of the palez are 
wanting. 
l. Centotheca lappacea, Desv.—Kunth, Enum. 1. p. 366.— 
Cape Palmas and Fernando Pe, Vogel; St. Thomas, Don; 
Tropical Asia and Australia. 
The Elytrophorus articulatus, Beauv., a common East In- 
dian plant, extends to Senegal. 
l. Festuca ro/tbüllioides, Kunth, Enum. 1. p. 395 ?—St- 
Thomas, Don ; perhaps introduced from Europe. 
No Bambusee are recorded from West Tropical Africa, nor 
were any specimens brought by the Expedition, excepting a few 
leaves of what appear to be the Bambusa vulgaris, from Accra, 
