262 
cl vii. GRAMiNEiE (Stapf). [Andropogon. 
ridge on the inside, whitish and thinly membranous in the groove, 
otherwise firmly chartaceous with numerous close nerves between 
the groove and the keels, smooth or variously scabrid on the back, 
spinulously ciliolate on the keels ; upper glume subchartaceous, 
boat-shaped, obliquely lanceolate in profile, acute or minutely mucro- 
nate, 3-nerved, spinulously ciliolate on the keel, villously ciliate on 
the margins. Lower floret reduced to a hyaline linear-oblong or 
linear-lanceolate 2-3-nerved ciliate valve, somewhat shorter than 
the glumes. Upper floret ^ : valve oblong, about 2J fin. long, 
more or less 2-fid, 3-nerved at the base, lobes acute and ciliate ; 
awn f to over 1J in. long, kneed and twisted well below the middle, 
column brown, bristle pale (or both pale), scaberulous ; valvule 
half the length of the valve, oblong, truncate to subacute, 2-nerved 
or nerveless. Anthers 1J-2J lin. long. Stigmas laterally exserted, 
purplish-brown to dark purple, 1 lin. long. Grain oblong, plano- 
convex, over 1 fin. long ; scutellum half the length of the grain. 
Pedicelled spikelets similar to the sessile, but usually broader 
and shorter, glabrous or variously hairy ; lower glume herbaceous, 
acute, very many-nerved, flat, continued into a bristle as long as 
or almost as long as itself ; upper glume membranous, 3-7-nerved, 
acute, mucronate or shortly aristulate ; valves and valvule similar 
to those of the sessile spikelet, except that the upper valve is acute 
and awnless.— St eud. Syn. Pl. Glum. i. 372 ; Hack, in DC. Monogr. 
Phan. vi. 447 ; Durand & Schinz, Consp. FI. Afr. v. 713 ; K. Schum. 
in Engl. Pfl. Ost-Afr. C. 97. A. guineensis , Steud. l.c. 371. A. 
tomentellus, Steud. l.c. 371 ; Durand & Schinz, l.c. 729. A. recon- 
ditus, Steud. l.c. 386. 
Andro'pogon guineensis, Schum. (Beskr. Guin. PI. 51) is very likely this species, 
but having seen no authentic specimens, I hesitate to insist on its identity, 
the more so as this would involve the replacement of the name gayanus (1832) 
by guineensis (1827). 
A. gayanus , as understood here, is a rather polymorphic species, the numerous 
forms of which may at present be classed under the following varieties. The 
occurrence of an often dense and coarse tomentum on the lower leaves, or more 
rarely on the spathes, seems to be unconnected with other distinctive characters 
and has been observed in each of the varieties. 
Yar. genuinus , Hack. l.c. 448. Joints and pedicels hairy on one side only, 
racemes therefore glabrous on the side exhibiting the lower glumes of the sessile 
spikelets or only hairy from the calli ; sessile spikelet mostly 3£-3§ lin. long ; 
callus-beard scanty and usually confined to the sides, awn mostly £-§ in. long ; 
pedicelled spikelets glabrous. — A. gayanus, Benth. in Hook. Niger FI. 572 
(Vogel’s specimens). 
Upper Guinea. Cape Yerd Islands : San Antao, Lowe ! Fogo, Newton ! 
San Nicolai, Bolle ! and without precise locality, Hooker, 88 ! Senegambia : 
without precise locality, Roger, 29 ! French Guinea : San, Chevalier, 2361 ! 
Tambukani, Chevalier, 2364 ! Dahomey : Cotonon, Chevalier , 4471 ! 
Southern Nigeria : Nun River, Vogel, 7 ! Ibu, Vogel, 32 ! Quorra, Vogel, 
36 ! Aguku District, Thomas, 963 ! Northern Nigeria : Lokoja (leaves gla- 
brous, spathes villous), Macleod, 29 ! Nupe, Baikie ! Barter, 281 ! 1383 I 
Yola, Macleod ! 
