Sorghum.'] 
CLV1I. GRAMINEiE (Stapf). 
Ill 
Perennial ; sessile spikelets broad-lanceolate - 
oblong, not acuminate or only obscurely so, 
3- 3o, lin. by almost 1 lin. ... ... ... 25. S. versicolor. 
Annual ; sessile spikelets lanceolate, acuminate, [ ceum . 
4- 5 lin. by 1 lin 26. S. purpureo-seri- 
Lower glume of sessile spikelets firmly coriaceous 
and usually dark brown or almost black up to 
the middle, then abruptly thinner, charta- 
ceous and green, lanceolate, acuminate, 3^-4 
lin. long... ... ... ... ... ... 27. S. dimidiatum. 
- Primary branches of panicle usually solitary, divided 
from the base, hence apparently semiverticillate ; 
pedicelled spikelets suppressed, but pedicels pre- 
sent : lodicules eciliate (§ Sorghastrum, nos. 28-33). 
Perennial ; racemes with 4-7 sessile spikelets, never 
all reduced to a solitary spikelet. 
Panicles with verf numerous racemes ; calli with 
short beards - ; leaf-blades flat or involute 
when dry. 
Leaf-blades about £ ft. long, the basal much 
shorter ; peduncles hairy towards the tips 
of racemes. 
Primary branches of panicle repeatedly 
divided, hence part of the racemes on 
branches of the 3rd order ; racemes 2-1- 
noded ... ... ... ... ... 28. S. trichopus. 
Primary branches simple or only once divided, 
hence the racemes terminal and lateral 
on them ; racemes 4-1-noded 29. S. micratherum. 
Leaf-blades up to 1| ft. long ; peduncles of 
racemes glabrous 30. S. rigidifolium. 
Panicles very scanty ; calli with long spreading 
beards ; leaf-blades j unciform, laterally com- yum. 
pressed ... ... ... ... ... ... 31. S. pogonostach- 
Annual ; all the racemes reduced to a solitary spike - 
let, accompanied by 2 empty pedicels. 
Glumes coriaceous, brown, the lower whitish at 
the base, 2\ lin. long 32. /S. bipennatum. 
Glumes subchartaceous, pale throughout, 2-2 J lin. 
long ... ... ... ... 33. S. incompletum. 
C 
1. S. virgatuxn A Stapf. Annual. Culms rather slender, usually 
with suberect branches from the lower and middle nodes, 4-5-noded, 
glabrous. Leaf -sheaths finely and densely silky-pubescent at the 
nodes, otherwise glabrous ; ligules 1 lin. long, thin ; blades narrowly 
linear, gradually, and the longer long, attenuated towards the base, 
6-18 in. long, 2-4 (rarely to 8) lin. broad, green or green tinged with 
red, glabrous, in robust specimens the midrib very stout. Panicle 
very narrow, J to over 2 ft. long ; rhachis more or less hairy to 
villous at the nodes ; branches erect or suberect, the lowest often 
up to \ ft. long, like the branchlets scabrid or spinulously ciliolate 
particularly upwards. Racemes fragile, few- to 7-noded, up to 
1| in. long ; joints slender, 2-2 J lin. long, white-ciliate, cilia J-l lin. 
osu> 
A. 
