70 FLORA. 



long; sessile spikelet 4-5 mm. long, the awn 1-1.8 cm. long. Wet soil, D. C. to 

 Fla. and Miss. Sept. Oct. [A. glomerulus (Walt) B. S. P. in part] 



Andropogon corymbosus abbrevi&tus (Hack.) Nash. Differs from the type in 

 having the spathes generally about equalling the racemes, and few if any of them narrow 

 and enrolled on the peduncles. Similar situations, Long Island to Fla. Sept.-Oct. 



4. Andropogon Virginicus L. Virginia Beard-grass. (I. F. f. 220.) 

 Culms tufted, 5-10 dm. tall, many times longer than the basal leaves; sheaths, at 

 least the lower ones, more or less tuberculate-hirsute on the margins; leaves 4 dm. 

 long <>r Less, more or less hirsute on the upper surface near the base; spathes 3-5 

 cm. Long, broad; racemes generally in pairs, 2-3 cm. long; sessile spikelets 3-4 

 mm. long, the awn 10-15 long; pedicellate spikelet wanting or rarely present as a 

 minute scale. Dry or moist fields, Mass. to 111., south to Fla. and Tex. Aug.- 

 Sept. 



5. Andropogon Elliottii Chapm. Elliott's Beard-grass. (I. F. f. 222.) 

 Culms tufted, 5-8 dm. tall; lower sheaths and those of the innovations densely ap- 

 pressed-hirsute, those of the inflorescence much enlarged and much crowded at the 

 summit, 8-1 1 cm. long; leaves 2 dm. or less long, rough above and hirsute near 

 the base; racemes in pairs, slender, 3-4 cm. long, those on the longer branch at 

 each node exserted. the rest concealed in the sheaths; sessile spikelets 4.5-5 mm - 

 long, the awn geniculate, 1.5-2.3 cm. long, usually spiral at the base, the column 

 much exserted. Dry sandy soil, Pa. (according to S. Watson), south to Fla. and 

 Miss. Sept.-Oct. 



6. Andropogon argyraeus Schultes. Silvery Beard-grass. (I. F. f. 217.) 

 Culms 6-12 dm. tall, simple at base, generally much branched above. Sheaths some- 

 what compressed; basal leaves 1.5-3 dm. l° n £; upper 5-20 cm. by 2 mm. wide; 

 spikes in pairs, 2.5-5 cm - l° n g> on exserted slender peduncles; joints of the rachis and 

 pedicels pubescent with long, silky-white-, spreading hairs; outermost scale of sessile 

 spikelet about 5 mm. long, acuminate, hispidulous; awn loosely spiral, 12-18 mm. 

 long, scabrous; pedicelled spikelet a minute deciduous scale. In dry sandy soil, 

 Del. to Mo., south to Fla. and Tex. Sept. [A. argenteus Ell.] 



7. Andropogon Cabanisii Hack. Cabanis' Beard-grass. Culms 6-10 

 dm. tall. Sheaths smooth or a little roughened; leaves 2.5 dm. or less long, 

 smooth beneath, rough above; racemes in pairs, 4-7 cm. long, grayish; sessile 

 spikelets 6-7 mm. long, broadly lanceolate, the first scale strongly hispidulous and 

 2-3-nerved lx'tween the keels; pedicellate spikelet of a single hispidulous scale 

 3-3.5 mm. long. Dry soil. Pa. (according to Hackcl) and Fla. June— Aug. 



8. Andropogon furcatus Muhl. Forked Bkard-grass. (I. F. f. 219.) 

 Culms stout, 9-18 dm. tall. Sheaths smooth and glabrous; leaves 1.5-4.5 dm. 

 long; spikes 2-5. in pairs or approximate, 5^10 cm. long; joints of rachis and 

 pedicels ciliate with short hairs; outermost scale of sessile spikelet 6-8 mm. long; 

 awn 10-14 mm. long; loosely spiral, geniculate; pedicelled spikelet of 4 scales. In 

 dry or moist soil. Me. to Man., south to Fla. and Tex. Aug.-Sept. 



9. Andropogon chrysocomus Nash. Yellow-haired Beard-grass. 

 Culms 7-15 dm. tall; sheaths smooth and glabrous; leaves 3 dm. long or less, 

 smooth beneath, a little roughened above; racemes in 2's-4's. 5-0 cm. long, stout, 

 kmg-exserted; sessile spikelets about 1 cm. long, the outer 2 scales hispid on the 

 nerves, the awn of the fourth seale twisted at the base, geniculate. 10-12 mm. long; 

 pedicellate spikelet awnless. Dry soil, Kans. to Tex. July-Sept. 



10. Andropogon Hallii Hack. Hall's Bkard-grass. (I. F. f. 218.) Culms 

 robust, 0-l8 dm. tall, more or less glaucous. Sheaths somewhat glaucous; leaves 

 3 dm. long or less; spikes 2-5, 5-10 cm. long; outermost scale of sessile spikelet 

 ab)Ut 8 mm. long, acuminate, glabrous at base, from sparingly to copiously silky - 



:it toward the apex; awn straight, 4-10 mm. long, or sometimes wanting; 

 pedicelled spikelet consisting of 4 scales, generally larger than the sessile spikelet 

 and enclosing three stamens. Dry sandy soil, Kans. and Mont, to Mex. Aug.- 

 Sept 



11. Andropogon paucipilus Nash. Scant-haired Beard-grass. Culms 

 IO-12 dm. tall, rather stout. Sheaths smooth and glabrous, as are the leaves 

 which are erect and 3 dm. long or less; racemes in 2*8—3*8, 5-7 cm. long, exserted; 



