112 FLORA. 



Panicle more or less contracted. 



Culms and almost filiform leaves soft, not rigid. 7. C. neglecta. 



Culms and wider leaves hard, more or less rigid. 



Panicle elongated, rather loosely flowered ; culms not tufted or but 



little so. 8. C. inexpansa. 



Panicle short, dense and spike-like ; culms strongly tufted. 



Panicle narrow, much interrupted below ; awn much shorter than 



the scale. 9. C. Labradorica. 



Panicle thick, continuous or but little interrupted ; awn about 



equalling the scale. 10. C. hyperborea. 



Prolongation of the rachilla hairy only at the summit. n. C. cinnoides. 



1. Calamagrostis breviseta (A. Gray) Scribn. PICKERING'S REED-GRASS. 

 (I. F. f. 376.) Culms 3-4.5 dm. tall, erect, rigid, simple, scabrous below the pani- 

 cle. Sheaths smooth and glabrous, the lower overlapping, the upper one elongated; 

 leaves 3.75-10 cm. long, 4 mm. wide, erect, smooth beneath, rough above; panicle 

 7.5-11.25 cm. in length, the branches ascending or erect, the lower 2.5-3.75 cm. long; 

 spikelets 3-4 mm. long, purple tinged, the outer scales acute, scabrous on the keel; 

 third scale shorter than the second, obtuse, scabrous, the basal hairs very short; 

 awn bent, not twisted, equalling or slightly exceeding the scale. In wet places, 

 Cape Breton Isl. to N. H. and Mass. Occurs in the alpine regions of the White 

 Mts. Aug. -Sept. 



Calamagrostis breviseta d^bilis Kearney. Differs from the above in its softer 

 texture, usually lower and more slender culms, thinner leaves, smaller panicles and the 

 narrower and thinner empty scales. Newf. to Mass. 



Calamagrostis breviseta laciistris Kearney. Differs from the species in its stouter 

 rootstock and taller culms, which are usually 5-10 dm. tall, in its often longer panicle, its 

 shorter palet and the copious and longer callus hairs of the flowering scale. Mountains 

 of N. E.; also along the Great Lakes from Ont. to Minn. 



2. Calamagrostis Pdrteri A. Gray. PORTER'S REED-GRASS. (I. F. f. 375.) 

 Culms 6-12 dm. tall, erect, simple, smooth and glabrous. Sheaths slightly sca- 

 brous, with a villous ring at the summit; leaves 1.5-3 dm. long, 4-8 mm. wide, 

 rough; panicle 1-2 dm. in length, the branches erect, the lower 2.5-5 cm - l n g; 

 spikelets 4-6 mm. long, the outer scales strongly scabrous, acute; third scale shorter 

 than or equalling the second, obtuse, scabrous, the basal hairs less than one-half 

 the length of the scale, sparse ; awn bent, about equalling the scale, the lower part 

 much twisted. In dry woods, Penn. and southern N. Y. Aug. -Sept. 



3. Calamagrostis nemoralis Kearney. WOOD REED-GRASS. Slightly glau- 

 cous. Culms 10-15 dm. tall, rather slender; sheaths loosely embracing the culm, 

 usually tomentose at the apex, glabrous; leaves 3-6 mm. wide, flat, very rough on 

 both surfaces, the lower ones and those on the innovations 2-3.5 dm. l n g> panicle 

 1-1.5 dm. l n g> contracted; spikelets numerous, 3.5-4 mm. long, the empty scales 

 acuminate, the awn of the flowering scale attached about one-fifth above the base, 

 slightly exceeding the scale, stout, bent near the middle, the palet about three- 

 fifths as long as the scale. Woods, Me. and western N. Y. 



4. Calamagrostis Langsdorfii (Link) Trin. LANGSDORF'S REED-GRASS. 

 (I. F. f. 374-) Culms 3-6 dm. tall, erect, simple, smooth or roughish. Sheaths 

 shorter than the internodes; leaves 13 dm. long, 48 mm. wide, scabrous; panicle 

 5-15 cm. in length, the branches ascending or sometimes erect, the lower 2.5-5 cm - 

 long, naked at the base; spikelets 4-6 mm. long, the outer scales acuminate, 

 strongly scabrous; the third scale equalling or shorter than the second, scabrous, 

 the stout awn as long as or a little exceeding the copious basal hairs which are 

 usually somewhat shorter than the scale. Newf. to Alaska, south to the mountains 

 of N. E. and N. Y., and to Manitoba and Wash. Also in northern Europe and 

 Asia. Summer. 



5. Calamagrostis Canadensis (Michx.) Beauv. BLUE JOINT-GRASS. (I. F. f. 

 373.) Culms 6 15 dm. tall, erect, simple, smooth or somewhat scabrous. Sheaths 

 shorter than the internodes; leaves 1.5-3 dm. long or more, 2-8 mm. wide, rough; 

 panicle 1-2 dm. in length, open, usually purplish, the branches spreading or 

 ascending, the lower 3.75-7.5 cm. long, naked at the base; spikelets 3 mm. long, the 

 outer scales equal or subequal, acute, strongly scabrous ; the third scale equalling 



