572 FLORA NIGRITIANA. 
spicula brevior, gluma exterior vix 2 lin. longa, in aris- 
tam tenuissime eapillaceam fere ejusdem longitudinis desi- 
nens. 
5. Andropogon tectorum, Schum. et Thonn. Beskr. p. 49.— 
Sierra Leone, Don ; Guinea, where, according to Thonning, it 
is the commonest grass, overrunning the fields from the shore 
to the hills. 
6. Andropogon Gayanus, Kunth, Enum. 1. p. 491.—On the 
Nun and Quorra, Vogel; on the Gambia, Boteler ; Nubia. 
7. Andropogon períusus, Willd.—Kunth, Enum. 1. p. 498.— 
Accra, Don; East and South Africa and East India. 
The Egyptian and South African forms have been published 
as distinct species, in East India the plant varies exceedingly ; 
possibly there may really be a group of several different species, 
but with the materials before me, I am totally unable to extri- 
cate their synonymy. 
8. Andropogon schenanthus, Linn.—On the Gambia and Sierra 
Leone, Don, Vogel; East India. 
The group of Lemon-grasses is another of those widely spread 
gregarious and variable grasses among which the number of 
real species, one or more, has not yet been properly ascertained. 
The Tropical African form is that to which Nees formerly 
applied Roxburgh’s name of Jwarancusa, and in some more 
recent publications, that of A. Martini, it is the commonest 
East Indian form, and probably the original A. schenanthus, . 
Linn, but certainly not the one Roxburgh distributed as 
A. Twarancusa. 
9. Andropogon arundinaceus, Willd.— Kunth, Enum. 1. p. 506. 
—On the Quorra, Vogel; Guinea. 
This agrees with the character as far as it goes. It is a tall- 
growing species, allied to A. Gryllus, with two rather long male 
spikelets on short pedicels at every articulation with the sessile 
hermaphrodite one, which is remarkable for its very long rigid 
twisted arista, very pubescent in its lower half. 
10. Andropogon verticillatus, Schum. et Thonn, Beskr. p. 50. 
—Acera, Don, Vogel. 
