Heteropogon .] Clvii. gramine^; (Stapf). 
415 
i. 367. H. polystictus , Hochst. in Flora, 1856, 28. H. scrobiculatus , 
Fourn. Gram. Mex. 64. Stipa melanocarpa, Muhl. Descr. Uber. 
Gram. 183. Cymbopogonmelanocarpus,^) preng. Syst. i. 289. Andro- 
pogon melanocarpus , Elliott, Sketch Bot. S. Carol, i. 146 ; Hack, in 
DC. Monogr. Phan. vi. 584 ; Durand & Schinz, Consp. FI. Afr. v. 717. 
A. scrobiculatus , Kunth, Enum. i. 507. A. polystichus , Hochst. ex 
Steud. l.c. 369. Trachypogon scrobiculatus , Nees, Agrost. Bras. 347. 
Nile Land. Abyssinia : Jelajeranne, Schimper, 2012. 
Lower Guinea. Angola : Pungo Andongo ; sandy woods by the River 
Cuanza between Mopopo and Sansamanda, Welwitsch, 7388 ! Amboland : 
Upingtonia, Schinz. 
Mozambique Distr. Rhodesia : without precise locality, Mundy ! 
Widely spread throughout the hot countries of both hemispheres ; probably 
of American origin. 
51. THEMEDA, Forsk. 
Spikelets 2-nate (the terminal 3-nate), those of the lower 2 pairs 
alike in shape and sex, or neuter, sessile to subsessile and closely 
approximate so as to form an involucre, of the following pair or pairs 
differing in sex and conspicuously so in shape, one of each pair sessile, 
the other pedicelled, on the rhaehis of solitary racemes, terminating 
the culms and their upper branches ; rhaehis terete, tough or tardily 
disarticulating and glabrous between the homogamous pairs, readily 
disarticulating below the fertile spikelets ; homogamous pairs or at 
least their sessile members persistent, the spikelets of the hetero- 
gamous pairs falling separately, the pedicelled with the pedicel, 
the sessile with the adjacent joint (if more than 1) and the base or 
bases of the adjacent pedicels. Florets 2, lower reduced to an empty 
valve, upper or neuter in the homogamous spikelets and the 
pedicelled members of the heterogamous pairs, ^ in the sessile 
members of the latter. Fertile spikelets terete, awned or awnless ; 
callus usually acute to pungent, densely bearded, beard more or 
less concealing the adjacent joint or pedicel-bases. Glumes equal, 
coriaceous except at the submembranous tips ; lower tightly 
involute, quite keelless, nerves very fine, obscure except in trans- 
mitted light, the upper with a deep longitudinal groove on each side, 
very firm between them, thin along the margins, 3-nerved. Valve 
of lower floret hyaline, nerveless, of upper floret stipitiform from a 
hyaline 1 -nerved base, cartilaginous upwards and passing into a 
stout geniculate awn or hyaline and 1 -nerved throughout with the 
nerve becoming stouter upwards and passing into a more or less 
reduced awn or quite awnless. Valvule hyaline, nerveless, small or 
0. Lodicules 2, somewhat large, glabrous. Stamens 3. Stigmas 
exserted subterminally or from near the middle of the floret. Grain 
linear-obovate, subterete, grooved on the face ; embryo about 
half as long as the grain. Involucral spikelets dorsally much com- 
pressed, awnless. Lower glume more or less herbaceous, 2-keeled ; 
