2o6 



GRAMINEAE. 



Vol. I. 



9. Agrostis Schweinitzii Trin. Thin-grass. Fig. 495. 



Agrostis Schweinitzii Trin. Mem. Acad. St. Petersb. 6 2 : 

 311. 1841. 



Culms i°-2i° long from a decumbent or prostrate 

 base, weak, slender, simple or sparingly branched 

 above, smooth and glabrous; ligule i" long; blades 

 2'-6' long, i"-2" wide, lax, scabrous; panicle 4'S' in 

 length, open, the branches 1/-2' long, widely spreading, 

 the branchlets and pedicels divergent; spikelets i"-i" 

 long, the outer scales acute, scabrous on the keel ; 

 third scale about three-quarters the length of the first, 

 smooth and glabrous, not awned; palet small or 

 wanting. 



In shaded damp places, Quebec to Wisconsin, south to 

 South Carolina and Kansas. Ascends to 6600 ft. in 

 North Carolina. Panicle usually light green, sometimes 

 purplish. Twin-grass. This species was described and 

 figured as Agrostis perennans in our first edition. July- 

 Sept. 



10. Agrostis perennans (Walt.) Tuckerm. Upland Bent-grass. Fig. 496, 



Cornucopiae perennans Walt. Fl. Car. 74. 1788. 



A. perennans Tuckerm. Am. Journ. Sci. 45: 44. 1843. 



Agrostis intermedia Scribn. Bull. Torr. Club, 20 : 476. 



1893. Not. Balb. 1801. 

 A. pseudo-intermedia Farwell, Ann. Rep. Com. Parks & Boul. 



Detroit 11 : 46. 1900. 

 A. Scribneriana Nash, in Small, Fl. SE. U. S. 126. 1903. 



Culms i°'-3° tall, erect, simple, smooth and glabrous. 

 Sheaths smooth, those at the base of the culm often 

 crowded and overlapping; ligule i"-2" long; blades 

 4'-o/ long, i"-3" wide, scabrous; panicle 4'-o/ in length, 

 the branches i¥-z' long, ascending, dividing at or below 

 the middle, the divisions divergent, ■ the pedicels ap- 

 pressed; spikelets about 1" long, the outer scales acute 

 or acuminate, scabrous on the keel; third scale about 

 three- fourths the length of the first, smooth; palet small 

 or wanting. 



In dry soil, Massachusetts and New York to New Jersey, 

 Tennessee and Missouri. Aug.-Oct. 



11. Agrostis altissima (Walt.) Tuckerm. Tall 

 Bent-grass. Fig. 497. 



Cornucopiae altissima Walt. Fl. Car. 74. 1788. 

 Agrostis altissima Tuckerm. Am. Journ. Sci. 45 : 44. 1843. 

 Agrostis elata Trin. Mem. Acad. St. Petersb. (VI.) Part 

 2, 364. 1845. 



Culms 2°-4° tall, erect, simple, smooth, usually stiff. 

 Sheaths overlapping, scabrous, the upper one elon- 

 gated; ligule i"-2" long; blades elongated, 6-1° in 

 length, i"-ii" wide, scabrous ; panicle j'-g' long, the 

 branches ascending or erect, somewhat scabrous, the 

 lower 2-4' in length, spikelet-bearing at the extremi- 

 ties; spikelets ii"-ii" long, the outer scales acute, 

 scabrous on the keel; third scale shorter, obtuse, sca- 

 brous, occasionally bearing a short awn ; palet small or 

 wanting. 



In sandy swamps, Long Island and New Jersey to 

 Florida and Mississippi. Panicle usually purplish. Tall 

 Thin-grass. Aug.-Oct. 



