GRAMINEAE. 1 1 3 



or slightly shorter than the second, scabrous, the awn delicate and equalling the 

 copious basal hairs which are about as long as the scale or some of them shorter. 

 In swamps and wet soil, Newf. to Alaska, south to N. Car., N. Mex. and Cal. 

 Ascends to 1500 m. in the Adirondacks. July-Sept. 



Calamagrostis Canadensis acuminkta Vasey. Differs from the species in its usually 

 smaller panicle, larger (3.5-4 mm. long) spikelets with the empty scales sharply acuminate, 

 and more scabrous and longer awn of the flowering scale. Lab. and Newf. to Alaska, 

 south in the Mountains to N. Car., N. Mex. and Cal. 



6. Calamagrostis Macouniana Vasey. MACOUN'S REED-GRASS. (I. F. f. 

 372.) Culms 6-9 dm. tall, erect, simple, smooth and glabrous. Sheaths shorter 

 than the internodes; leaves 7.5-17.5 cm. long, 2-5 mm. wide, erect, acuminate, 

 scabrous; panicle open, 7.5-11.25 cm. in length, the branches ascending, or some- 

 times erect, the lower 2.5-3.75 cm. long, naked at the base; spikelets 2 mm. long, 

 the outer scales acute, scabrous, the first shorter than the second; third scale 

 equalling the second, the awn a little exceeding it; basal hairs about as long as the 

 scale. Manitoba and Mont, to Wash., south to Mo. Summer. 



7. Calamagrostis negl&cta (Ehrh.) Gaertn. NARROW REED-GRASS. (I. F. f. 

 378.) Glabrous and smooth throughout. Culms 4.5-6.25 dm. tall, erect, simple, 

 slender. Sheaths shorter than the internodes; leaves narrow, involute in drying, 

 the basal one-third as long as the culm, those of the culm 5-12.5 cm. long, erect; 

 panicle contracted, 6.25-10 cm. in length, the branches 2.5 cm. long or less, erect; 

 spikelets 4 mm. long, the scales scabrous, the outer acute; third scale obtuse, 

 about three-fourths as long as the second, the awn exceeding the scale. Lab. 

 to Alaska, south to northern Me., Wis., Mont., Colo., and Ore. Also in Europe 

 and Asia. Summer. 



Calamagrostis neglecta borealis. Differs from the species in its shorter culms (2-3 

 dm. tall) and leaves, smaller and denser panicle (3-5 cm. long), and the spikelets but 3 

 mm. long. Lab. and Hudson Bay. Also in northern Europe. 



8. Calamagrostis inexpansa A. Gray. BOG REED-GRASS. Culms but little 

 tufted, 8-12 dm. tall. Sheaths smooth and glabrous; leaves rough, 2-3 dm. long, 

 4mm. wide or less; panicle 1.5-2 dm. long, usually nodding at the summit, its 

 branches rather long, nearly erect; spikelets 4-4.5 mm. long, numerous, the empty 

 scales scabrous, hispid on the keel, acute, the flowering scale scabrous, the callus- 

 hairs from three-fourths as long to equalling the scale, the awn from shorter to ex- 

 ceeding the scale. Bogs and sandy banks, N. J. and western N. Y. to S. Dak. 

 and Colo. 



9. Calamagrostis Labradorica Kearney. LABRADOR REED-GRASS. Culms 

 3.5-5 dm. tall, rigid. Sheaths tightly embracing the culm; leaves 5-20 cm. long, 

 2.5 mm. or less wide, strongly involute, thick, scrabrous above, smooth beneath; 

 panicle spike- like and dense, 6-9 cm. long, strict; spikelets about 4 mm. long, the 

 empty scales acute, nearly glabrous excepting on the hispidulous keels, firm, thick, 

 dark purple, the flowering scales about 3.5 mm. long, scabrous, the awn much 

 shorter than the scale, usually slender, the callus-hairs from somewhat shorter to 

 nearly equalling the scale. Among rocks on the seashore, Lab. July. 



10. Calamagrostis hyperborea Lange. NORTHERN REED-GRASS. Culms 

 densely tufted, rigid, stout, 4-10 dm. tall. Sheaths smooth and glabrous; leaves 

 very rough on both surfaces, flat, or often involute toward the apex, stiff, 1-3 dm. 

 long, 5 mm. or less wide; panicle contracted, 7-14 cm. long, its branches short, 

 usually erect, sometimes ascending; spikelets 3-4 mm. long, the empty scales 

 scabrous, acute, the flowering scale with the callus-hairs from a little shorter than 

 to nearly equalling it, the awn shorter than or longer than the scale. Meadows 

 and swamps, Greenland to Alaska, south toPenn., Colo, and Cal. June-Aug. Very 

 variable. The var. ELONGATA Kearney has the panicle very long and rather loose, 

 with usually longer branches, and the spikelets 3-4 mm. long; the var. AMERI- 

 CANA (Vasey) Kearney has the panicle usually very dense and the spikelets about 

 3 mm. long. 



11. Calamagrostis cinnoides (Muhl.) Scribn. NUTTALL'S REED-GRASS. 

 (I. F. f. 379.) Culms 9-15 dm. tall, erect. Sheaths smooth or rough, the lower 



