13 
Var. FLAVEOLUS Hack. Hairs of the rachis and pedicel straw-colored, a few long 
hairs also near the apex of the first and second glumes; awn of the fertile flower 
short, little exserted. 
Var. INCANESCENS Hack. Joints of the spikes white, canescent spikelets 5 to 6 
lines long; awn of the fertile flower short or wanting. 
18. A. Wrightii Hack. in Flora 1885, p. 139. Culms 2 to 3 feet high, unbranched, 
the nodes glaucous and sometimes ciliate; leaves narrow, smooth, 6 to 10 inches long, 
shorter than the internodes, ligule short, ciliate; common rachis smooth; racemes 3 
to 7, somewhat digitate or subfastigiate, 14 to 2 inches long, conspicuously pedicellate 
(the lower pedicels sometimes 6 to 8 lines long), 12 to 15 jointed, joints of rachis and 
sterile pedicels ciliate; spikelets 24 to 3 lines long, equal; lower glume of fertile 
spikelet smooth, ciliate near the apex, 7-nerved, the nerves disappearing below the 
apex; second glume, chartaceous, 3-nerved; third glume hyaline, smooth, obtuse; 
fourth glume with an awn 6 to 8 lines long; pediceled spikelet male, as long as the 
sessile one; first glume obtusish, 9-nerved, the upper part ciliate-margined ; second 
glume obtuse, 3-nerved ; third glume hyaline, nerveless, smooth, one-third shorter 
than the first; fourth glume and palet wanting; stamens 3.—Texas to Mexico. 
19. A. saccharoides Swartz. (4. laguroides DC. in part: Gray’s Manual, 6th ed., p. 
638.) Culms erect or ascending, simple, smooth; nodes smooth or ciliate; leaves 
numerous, sheaths terete, striate, shorter than the internodes, smooth or hairy at the 
throat; ligule short, obtuse, blade linear, narrowed to a long setaceous point, rigid, 
glaucous or glaucescent; panicle 2 to 5 inches long, often 1 to 14 inches wide, loosely 
contracted or dense, the upper branches single and nearly sessile, the lower branches 
generally subdivided ; spikes or racemes usually very numerous (30 to 50), sometimes 
reduced to 10 or 12, 1 to 2inches long; the joints of rachis and pedicels copiously 
clothed with long white hairs obscuring the flowers; sessile spikelets 2} to 3 lines 
long, the pediceled ones one-third shorter and imperfect ; first glume 5- to 7-nerved, 
obtuse or bidentate at apex, smooth, except sparsely hairy below; third glume hya- 
line, one-third shorter than the first; fourth glume reduced to a narrow margin of 
the awn, which is usually 9 to 12 lines long. 
Var. BARBINODIS Hack. Culms robust, nodes densely barbate, panicle large and 
showy. 
Var. TORREYANUS Hack. Sheaths and nodes generally smooth. 
Var. SUBMUTICUS Vasey. Culms more slender, panicle narrower, spikelets 
smaller, 14 lines long; first glame oblong lanceolate, bidentate, 5-nerved, awn about 
4 lies long, or almost wanting.—Southern Kansas, Colorado, Texas, New Mexico 
and Arizona. 
Note—The genus SORGHUM Pers. (included by Prof. Hackel in Andropogon) is 
represented in this country only by cultivated species, first, 8. halapense, which is 
commonly called Johnson grass, and is extensively cultivated as a forage plant; and 
second, S. vulgare, including the many varieties cultivated fur sugar, fodder, and 
broom-making. 
HILARIA H. B. K. 
Inflorescence in terminal spikes; the spikelets in small clusters of 
three, closely sessile at the joints of the rachis, the central spikelet 
containing a single fertile flower, either female or perfect, the two 
lateral spikelets each with two or three male flowers. The outer glumes 
of the spikelets unlike, mostly thin, rigid, and strongly nerved, some 
lobed or bifid, dentate or lacerate at the apex, some awnless, and some 
awned between the lobes. The spikes are sometimes so closely sessile 
as to require much care to separate them properly. 
