GRASS FAMILY. 





i. Andropogon scoparius Michx. Broom Heard -grass. (Pig. 216.) 



Andropogon scoparinm Michx. Fl. Bor. Am. i: 57. 

 1803. 



Culms from a creeping rootstock, smooth, 

 simple or much branched, 2-4 tall. Sheaths 

 smooth or scabrous, sometimes glaucous; leaves 

 6 / -i2 / long, 1"-$" wide, acuminate, scabrous; 

 spikes i '-2' long, loose, solitary, on long-cx- 

 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 Albertu, 

 south to Florida, Louisiana and Texas. Ascends 

 to 3000 ft. in Georgia. Specimens determined as 

 ./. iiiitritiiHiis Chapm., from Cape May, N. J., ap- 

 pear to be referable to this species. Aug.-Oct. 



2. Andropogon argyraeus Schultes. Silvery Beard-grass. < Fig. 217.) 



Andropogon at <;< ///,-// I-;il li.it S C. At (la. i 



1817. Not DC. 1813. 



.\>iiin>f><n;;iii ,i i hiilti-.. Mant a 450. 1*34. 



Attdnipnifon //</:/.*// ' pr-v < )j.u-. &J :- 



Culms erect, smooth, 2-4 tall, simple at base. 

 generally much branched above. Sheath* 

 what compressed, glabrous or pubescent ; 

 leaves 6'-i; upper 2'-8' by i" wide, acuminate. 

 smooth to scabrous above, glabrous or puliescent 

 beneath; spikes in pairs, I'-a' 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 iYz" long, acuminate, scabrous ; awn 

 loosely spiral, 6"-o." long, scabrous ; pedicelln! 

 spikelet reduced to a minute lanceolate acuminate 

 scabrous scale, which is early deciduous. 



In dry sandy soil, Prlaw.it: \ Missouri, sooth to 

 Florida and Texas. Cultn UMVI-* Mmru-t .md broader 

 than the basal one*. Sept 



Andropogon Hallii Hack. Hall's Beard-grass. 



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 /x -4 /r 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. 

 Sept." 



Au jr.- 



