Io4 GRAMINEAE. 
1. Chrysopogon avenaceus (Michx.) Benth. Indian Grass. (Fig. 224.) 
Andropogon'avenaceum Michx. F1. Bor. Am. 1: 58. 
1803. 
Sorghum nutans A. Gray, Man. 617. 1848. 
Sorghum avenaceum Chapm. Fl. S. States, 583. 
1860. 
Chrysopogon avenaceus Benth. Journ. Linn. Soc. 
19:73. 1881. 
Culms erect, 3°-8° tall, from creeping root- 
stocks, smooth, the nodes pubescent. Sheaths 
smooth; lower leaves 1° or more in length, 
2//-8’’ wide, long-acuminate, scabrous; panicle 
4-12’ long; branches 2-4’ long, slender, erect- 
spreading; sp’kelets in pairs, orin 3’s at the ends 
of the branches, erect or somewhat spreading ; 
first scale of sessile spikelet 3’/-4’’ long, acute, 
pubescent with long hairs; second scale glab- 
rous; awn 5/’-10” long, the column very little 
if at all bent; lateral spikelets reduced to 
ly plumose pedicels. 
In dry fields, Ontario to Manitoba, south to 
Rhode Island, Florida and Arizona. Panicle brown- 
ish-yellow. Aug.—Sept. 
Chrysopogon nutans (I.) Benth., distinguished from this species by its longer awn (12!'—15'/ 
long), supported on a column distinctly bent at about the middle, occurs in Tennessee and is 
said to have been recently found in Kentucky. 
6. SORGHUM Pers. Syn. I: 101. 1805. 
Annual or perennial grasses with long broad flat leaves and terminal ample panicles, 
Spikelets in pairs at the nodes, or in 3’s at the ends of the branches, one sessile and perfect, 
the lateral pedicelled, staminate or empty. Sessile spikelet consisting of 4 scales, the 
outer indurated and shining, obscurely nerved, inner hyaline, the fourth awned and sub- 
tending a small palet and perfect flower, or palet sometimes wanting. Stamens 3. Styles 
distinct. Grain free. [Name Indian. ] 
About 13 species, of wide distribution in tropical and warm-temperate regions. 
1. Sorghum Halepénse (I,.) Pers. Johnson-grass. (Fig. 225.) 
Holcus Halepensis 1. Sp. Pl. 1047. 1753. 
Andropogon Halepensis Brot. F1. Iusit. 1: 89. 1804. 
Sorghum Halepense Pers. Syn. 1: 101. 1805. 
Culms erect, 3°-5° tall, simple or sometimes 
much branched, smooth and glabrous. Sheaths 
smooth; leaves 1° or more long, %’-1’ wide, 
long-acuminate; panicle open, from 14°11!s° 
long, the generally whorled branches spreading 
and naked towards the base; outer scales of ses- 
sile spikelet 2’’-3/’ long, ovate-lanceolate, usually 
purplish, pubescent with long appressed hairs ; 
awn when present 4’/-8’’ long, more or less bent; 
pedicelled spikelets of 4 scales, the outer two 
about 3’’ long, membranous, 7-9-nerved, their in- 
rolled margins ciliate, the inner two shorter and 
narrower, hyaline, sometimes with staminate 
flowers. 
In fields and waste places, soutlrern Pennsylvania 
to Missouri, south to Florida and Texas. Widely dis- 
tributed by cultivation in tropical America. Native 
of southern Europe and Asia. July-Sept. y : 
