IIO FLORA. 



both surfaces, 3.75-8.75 cm. long, 3 mm. or less wide; panicle dense and con- 

 tracted, 3.75-10 cm. Long, 6-12 mm. thick, its branches erect, the longer 3.1 cm. 

 long <>r less; spikelets 2-2.5 mm - l° n £> empty scales acute, the flowering scale 

 about three-quarters as long as the spikelet, denticulate at the truncate or rounded 

 apex; palet about one-half as long as the scale. Me. to N. J. Also in Europe. 

 July-Sept. 



3. Agrostis asperifdlia Trim Rough-leaved Bent-grass. (I. F. f. 

 363.) Culms 3-9 dm. tall, erect, or sometimes decumbent at the base. Leaves 

 2.5-20 cm. long, 2-8 mm. wide, generally erect, flat, very rough; panicle contracted, 

 6.25-25 cm. in length, often interrupted or glomerate, the branches 3.75-7.5 cm. in 

 Length, erect, spikelet-bearing to the base; spikelets crowded, 2-2.5 mm - l° n g> tne 

 outer scales scabrous, especially on the keel; third scale about three-fourths the 

 Length of the second; palet minute. Manitoba to Wash., south to Wis., Neb., Tex. 

 and Cal. Aug. -Sept. (A. exarata Trin. in part.) 



4. Agrostis Elliottiana Schultes. Elliott's Bent-grass. (I. F. f. 364.) 

 Culms 1.25-3.5 dm. ta ^> erect, slender. Leaves rough, 1.25-5 cm - l° n g> 2 mm - 

 wide or less; panicle 5-12.5 cm. in length, usually narrow, sometimes open, the 

 branches slender, naked below, erect or ascending, the lower 2.5-3.75 cm. long; 

 spikelets 1.5 mm. long; outer scales subequal, scabrous on the keel, acute; third scale 

 about three-quarters as long as the first, erose-truncate, acute or 2-toothed, bearing 

 a very finely filiform flexuous barbellate awn, 2-4 times its length, inserted just 

 below the apex; palet short. In dry soil, S. Car. to Ky. and Kans., south to Fla. 

 and Tex. May-July. 



5. Agrostis rupestris Allioni. Rock Bent-grass. (I. F. f. 365a.) Culms 

 tufted, 1.5 dm. tailor less, slender, erect, or decumbent at the base. Leaves smooth 

 and glabrous, those on the culm 2.5 cm. or less long, the basal leaves from one-third 

 to one-half as long as the culms; panicle contracted, 2.5 cm. or less long, its axis and 

 branches smooth, the latter erect or nearly so, spikelet-bearing above the middle; 

 spikelets about 2 mm. long; flowering scale hyaline, denticulate at the obtuse or 

 truncate apex, bearing about the middle a dorsal scabrous awn a little over 2 mm. 

 long; palet wanting. Lab. and the high mountains of Nev. Also in Europe. 

 Summer. 



6. Agrostis canina L. Brown Bent-grass. (I. F. f. 365.)- Culms 3-6 dm. 

 tall, erect, slender, simple. Leaves 2.5-7.5 cm. in length, 2 mm. wide or less, 

 scabrous; panicle 5-17.5 cm. in length, contracted in fruit, the branches slender, 

 naked below, ascending or spreading in flower, the lower 2.5-6.25 cm. long; spike- 

 lets 2 mm. long, on appressed pedicels, the outer scales subequal, acute, strongly 

 scabrous on the keel; third scale about two-thirds the length of the first, obtuse, 

 smooth and glabrous, bearing a straight or somewhat bent dorsal awn 2-4 mm. long, 

 inserted just above the middle; palet minute or none. In meadows, Newf. to Alaska, 

 south to Penn. and Tenn. Native northward; naturalized from Europe southward. 

 A variable species. July.-Sept. 



7. Agrostis rubra L. Red Bent-grass. (I. F. f. 366.) Smooth or very 

 nearly so, glabrous. Culms 1.5-6 dm. tall, erect or sometimes decumbent at the 

 base, simple ; leaves 5-10 cm. long, 1-3 mm. wide ; panicle 6.25-12.5 cm. in 

 length, open, the branches generally widely spreading and more or less flexuous, 

 rarely erect, the lower 2.5-6.25 cm. long; spikelets 2.5-3 mm - l° n g> the outer scales 

 acute, scabrous on the keel; third scale shorter than the first, obtuse, bearing a 

 usually bent dorsal awn 4-5 mm. long, inserted below the middle. Summits of the 

 highest mountains of N. E., N. Y. and N. Car. The American plant may be specifi- 

 cally different from the European. Summer. 



8. Agrostis perennans (Walt.) Tuckerm. Thin-grass. (I. F. f. 367.) 

 Culms 3-7.5 dm. long from a decumbent or prostrate base, weak, slender, simple 

 or sparingly branched above, smooth and glabrous. Leaves 5-15 cm. long, 2-4 

 mm. wide, lax. scabrous; panicle 1-2 dm. in length, open, the branches 2.5-5 cm. 

 long, widely spreading, the branchlets and pedicels divergent; spikelets 1. 5-2 

 mm. lorn:, 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 and Orit. to Wis., south to S. Car. and 

 Kans. Panicle usually light green, sometimes purplish. July Sept. 



9. Agrostis hy emalis (Walt.) li. S. 1\ Rouen 1 1 air-grass. (I. F. f. 368.) 



