GRAMINEAE. Ill 



Culms 3-6 dm. tall, erect, slender. Leaves 5-12. 5 cm. long, 1-3 mm. wide, usually 

 erect, roughish; panicle 1.5-6 dm. long, usually purplish, the capillary scabrous 

 branches ascending, sometimes widely spreading, or often drooping, the lower 

 7.5-15 cm. long, dividing above the middle, the divisions spikelet-bearing at the 

 extremities; spikelets 1.5-2 mm. long, the outer scales acute, scabrous toward the 

 apex and on the keel; third scale two-thirds the length of the first or equalling it. 

 obtuse, rarely bearing a short awn; palet usually very small. In dry or moist soil 

 throughout nearly the whole of N. Am. except the extreme north. July- Aug. 



10 Agrostis altissima (Walt.) Tuckerm. TALL BENT-GRASS. (I. F. f. 369.) 

 Culms 6-12 dm. tall, erect. Leaves elongated, 1.5-3 dm. in length, 2-3 mm. wide, 

 scabrous; panicle 1.75-2.25 dm. long, the branches ascending or erect, somewhat 

 scabrous, the lower 5-10 cm. in length, spikelet-bearing at the extremities; spike- 

 lets 2.5-3 mm. long, the outer scales acute, scabrous on the keel; third scale shorter, 

 obtuse, scabrous, occasionally bearing a short awn; palet small or wanting. In 

 sandy swamps, N. J. to Fla. and Ala. Panicle usually purplish. Aug.-Oct. 



11. Agrostis intermedia Scribn. UPLAND BENT-GRASS. (I. F. f. 370.) 

 Culms 3-9 dm. tall, erect. Sheaths smooth, those at the base of the culm often 

 crowded and overlapping; leaves 1-2.25 dm. long, 2-6 mm. wide, scabrous; pan- 

 icle 1-2. 25 dm. in length, the branches 3. 75-7. 5 cm. long, ascending, dividing atthe 

 middle or below, the divisions divergent, the pedicels appressed; spikelets about 2 

 mm. 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, Mass, to N. Y., Tenn. and Mo. Aug.-Oct. 



12. Agrostis Novae-Angliae Tuckerm. NEW ENGLAND BENT-GRASS. 

 (I. F. f. 371.) Culms 2-4 dm. tall, erect. Sheaths longer than the internodes, 

 generally overlapping; leaves 2.5 8.75 cm. long, 2 mm. wideorless, erect, usually 

 involute, scabrous; panicle 1-2 dm. in length, open, the branches spreading or as- 

 cending, dividing at or below the middle, the divisions divergent, the pedicels often 

 appressed; spikelets 2.5-3 mm. long, the outer scales acute, strongly scabrous on 

 the keel; third scale somewhat shorter, obtuse. New T f., south to the high mountains 

 ofN. E., N. Y. andN. Car. 



42. CALAMAGROS1IS Adans. 



Generally perennial grasses, various in habit, with flat leaves and paniculate 

 inflorescence. Spikelets i-flowered, the rachilla usually prolonged beyond the 

 flower and pubescent. Scales 3 ; the 2 outer empty, carinate, membranous ; the 

 third scale hyaline, shorter than the outer, obtuse, usually copiously long-hairy at 

 the base, or rarely the hairs scanty or short, and bearing a straight, bent, or twisted 

 dorsal awn ; palet shorter, 2-nerved. Stamens 3. Styles short, distinct. Stigmas 

 plumose. Grain free, enclosed in the scale. Seed adherent to the pericarp. 

 [Greek, signifying Reed-grass.] A genus of about 130 species, widely distributed 

 throughout temperate and mountainous regions, and particularly numerous in the 

 Andes. Besides thefollowiiig, some 20 others occur in the western parts of N. Am. 

 The English name Small-reed is applied to any of the species. 



Prolongation of the rachilla hairy its whole length. 



Awn strongly bent, manifestly exserted, the hairs of the callus much shorter than 



the scale. 

 Sheaths usually naked at the summit, rarely bearded ; panicle tinged with 



purple; empty scales rather thick. i. C. breviseta. 



Sheaths bearded at the summit ; panicle pale ; empty scales thin. 



Spikelets 4-6 mm. long ; callus-hairs sparse ; palet equalling the scale or 



nearly so. 2. (J. Porteri. 



Spikelets 3.5-4 mm. long; callus-hairs rather copious; palet considerably 



shorter than the scale. 3. C. netnoralis. 



Awn straight or nearly so, included, the hairs of the callus equalling or but little 



shorter than the scale. 

 Panicle open, the lower rays widely spreading. 



Spikelets 4-6 mm. long, very acuminate. 4. C. Langsdorfii. 



Spikelets 3-4 mm. long ; panicle usually loosely flowered. 



5. C. Canadensis. 

 Spikejets 2-2.5 mm. long ; panicle rather densely flowered. 



6, (7, Macouniana. 



