GRASS FAMILY. IOI 
1. Andropogon scoparius Michx. Broom Beard-grass. (Fig. 216.) 
Andropogon scoparium Michx. Fl. Bor. Am. I: 57. \ iN : 
1803. 
Culms from a creeping rootstock, smooth, 
simple or much branched, 2°-4° tall. Sheaths 
smooth or scabrous, sometimes glaucous; leaves 
6/-12’ long, 1’’-3’’ wide, acuminate, scabrous ; 
spikes 1/-2/ long, loose, solitary, on long-ex- 
serted slender peduncles; rachis slender, flex- 
uous, joints and pedicels ciliate with long 
spreading hairs; outermost scale of sessile spike- 
let about 3’ long, acuminate, scabrous; awn 
spiral, more or less bent at point of exsertion, 
5//-6’’ long, scabrous; pedicelled spikelet re- 
duced to a single awn-pointed scale. 
In dry sandy fields, New Brunswick to Alberta, 
south to Florida, Louisiana and Texas. Ascends 
to 3000 ft. in Georgia. Specimens determined as 
A. maritimus Chapm., from Cape May, N. J., ap- 
pear to be referable to this species. Aug.—Oct. 
2. Andropogon argyraéus Schultes. Silvery Beard-grass. 
Andropogon argenteus Ell. Bot. S. C. & Ga. 1: 148: 
1817. Not DC. 1813. 
Andropogon argyraeus Schultes, Mant. 2: 450. 1824. 
Andropogon Belvisti Desv. Opuse. 67. 1831. 
Culms erect, smooth, 2°-4° tall, simple at base, 
generally much branched above. Sheaths some- 
what compressed, glabrous or pubescent; basal 
leaves 6/-1°; upper 2’-8’ by 1/’ wide, acuminate, 
smooth to scabrous above, glabrous or pubescent 
beneath; spikes in pairs, 1/-2’ long, on more or 
less exserted slender peduncles; joints of the 
rachis and pedicels pubescent with long silky white 
spreading hairs; outermost scale of sessile spike- 
let about 2'%45’’ long, acuminate, scabrous; awn 
loosely spiral, 6’/-9’’ long, scabrous; pedicelled 
spikelet reduced to a minute lanceolate acuminate 
scabrous scale, which is early deciduous. 
In dry sandy soil, Delaware to Missouri, south to 
Florida and Texas. Culm leaves shorter and broader 
than the basal ones. Sept. 
3- Andropogon Hallii Hack. Hall’s Beard-grass. (Fig. 218.) 
Andropogon Hallii Hack. Sitz. Akad. Wiss. Wien, 89: 
127. 1884. 
Culms robust from a creeping rootstock, 3°-6° tall, 
simple at base, branched above, smooth, more or less 
glaucous. Sheaths somewhat glaucous; leaves 1° or 
less long, 3/’-4’’ wide, smooth; spikes 2-5 together, 
2/-4’ long, the lateral ones often included in the 
spathes ; joints of rachis and pedicels pubescent with 
spreading silky white or yellow hairs of about their 
own length ; outermost scale of sessile spikelet about 
4’ long, acuminate, glabrous at base, from sparingly 
to copiously silky-pubescent toward the apex; awn 
2/’-5/ long, or sometimes wanting ; pedicelled spike- 
let consisting of 4 scales, the outermost generally 
larger than the corresponding scale of the sessile 
spikelet and subtending a palet and three stamens. 
Dry sandy soil, Kansas and Montana to Mexico. Aug.— 
Sept. 
