2 
multo tenuior angustior lateribus hyalinis ciliatis inflexis, 5—9-nervis. 
Valvae hyalinae; inferior ciliata, 3-nervis, vacua, superior eciliata, 
apice emarginata, interdum e sinu aristulata cum valvula brevi enervi 
glabra.—Gramina perennia, robusta vel graciliora ; culmi simplices ; 
foliorum laminae angustae vel angustissimae ; ligulae membranaceae, 
longiusculae.—Andropogon § Diheteropogon, Hack. Mon. Androp. p. 647. 
Species 3, in Africa tropica occidentali. 
D. grandiflorus, Stapf (comb. nov.); a D. Buchneri, Stapf (Andro- 
pogon Buchneri, Hack. iffert spicularum paribus homogamis 
pluribus, articulis inter paria heterogama longius ciliatis, spiculae 
3 gluma inferiore glaberrima. 
Gramen perenne, ad 2 m. altum. Culmi erecti, simplices, paucinodes, 
teretes, laeves, glabri. Folia glabra; vaginae teretes, prominule 
striatae, praeter imam quam internodia breviores; ligulae firme 
scariosae, rotundato-truncatae, 1-5 mm. longae ; laminae lineares e 
basi paulo contracta, planae, perlonge in apicem setaceum attenuatae 
et arcte involutae, rigidae, ad 25 cm. longae et infra medium ad 10 mm. 
latae, saepius vero angustiores, praeter margines subscaberulos laeves, 
vis utrinque prominulis, costa tenui. Racemi ad 13 cm. ongi, unus 
sessilis, alter pedunculo 1 cm. longo suffultus, 5-7 mm. lati, primo 
con 
; , glaberrima, apice hyalino ad utramque 
carinam tenuiter 3—4- +3 ° . 
TropicaL Arrica. North es ‘ ‘iti 
Barter, 1373. ern Nigeria; Nupe, in open plains, 
A very similar plant was collected by Dybowsky in the French 
Gaboon in 1891, but the specimen is too incomplete to admit of its 
