Figure 437. — Calamagrostis nubila. Glumes and 

 floret, X 10. (Boott, N. H.) 



MANUAL OF THE GRASSES OF THE UNITED STATES 



tufts at the sides, the hairs of the ra- 

 chilla scarcely as long, scant. % 

 — Wet rocks, New York (Thatcher's 

 Pinnacle, near Ithaca, type locality). 



12. Calamagrostis insperata Swal- 

 len. (Fig. 434.) Culms 85 to 95 cm. 

 tall, erect from slender creeping rhi- 

 zomes; sheaths glabrous on the collar; 

 ligule 5 mm. long; blades flat, rather 

 thin, 4 to 8 mm. wide, 10 to 22 cm. 

 long, acuminate, glabrous, the mar- 

 gins scabrous; panicles 12 to 14 cm. 

 long, the branches narrowly ascend- 

 ing, at least some of them naked at 

 the base; spikelets 5 to 5.5 mm. long; 

 lemma 4 mm. long, scaberulous on the 

 keel, the callus hairs in tufts at the 

 sides, rather dense, some of them half 

 to three-fourths as long as the lemma; 

 rachilla 0.5 mm. long, the hairs as 

 much as 2 mm. long; awn from about 

 one-fourth above the base, about as 

 long as the lemma, geniculate. 91 

 — Known only from Ofer Hollow, 

 Jackson County, Ohio. 



13. Calamagrostis lacustris 

 (Kearn.) Nash. (Fig. 435.) Culms 

 rather slender from short rhizomes, 35 

 to 100 cm. tall; sheaths and blades 

 scabrous, the blades firm, 2 to 4 mm. 

 wide; panicle 8 to 15 cm. long, 1 to 

 2.5 cm. wide, relatively dense, or with 

 one of the lower fascicle of branches 

 naked at base, the axis scabrous; 

 spikelets 4 to 4.5 mm. long; glumes 

 firm, rather broad, scabrous; lemma 

 about 3.5 mm. long, scabrous, the 

 awn from near the base, about as long 

 as the lemma, geniculate ; callus hairs 

 about half to two-thirds as long as the 

 lemma, in 2 tufts at the sides; rachilla 

 minute, its hairs exceeding those of 

 the callus. % — Mossy rocks, 

 marshy meadows, and sandy shores, 

 Ontario, Vermont, eastern New York, 

 northern Michigan, and eastern Min- 

 nesota. 



14. Calamagrostis fernaldii Louis- 

 Marie. (Fig. 436.) Culms loosely 

 tufted, about 80 cm. tall; sheaths gla- 

 brous on the collar; blades elongate, 

 2 to 4 mm. wide, scabrous on both 

 surfaces; panicle 8 to 9.5 cm. long, 



321 



narrow, pale; glumes 3.5 to 4 mm. 



long; lemma 3.2 to 3.6 mm. long, sca- 

 brous, minutely toothed, the awn 

 from near the base, scarcely as long as 

 the lemma, the palea about two- 

 thirds as long; callus hairs in tufts at 

 the sides, half to two-thirds as long as 

 the lemma; rachilla hairs two-thirds 

 to three-fourths as long as the lemma. 

 % — Wet cliffs, only known from 

 Boarstone Mountain, Piscataquis 

 County, Maine. 



15. Calamagrostis nubila Louis- 

 Marie. (Fig. 437.) Culms tufted, 

 erect, 55 cm. tall; sheaths mostly 

 overlapping, scaberulous toward the 

 summit; ligule 3 to 5 mm. long; blades 

 flat, 12 to 18 cm. long, 4 to 5 mm. 

 wide, long-attenuate, scabrous on 

 both surfaces, the upper exceeding the 

 inflorescence; panicle pale, 13 to 14 

 cm. long, about 4 cm. wide, many- 

 flowered but rather loose, probably 

 nodding, the axis and branches flexu- 

 ous, scabrous; spikelets on short sca- 

 brous pedicels; glumes 4.5 to 5.2 mm. 

 long, scabrous, the second indistinctly 

 3-nerved; lemma 4.5 mm. long, 

 toothed at the acuminate apex, the 

 awn from near base, about as long as 

 the lemma, bent and protruding from 

 side of glumes; palea about two-thirds 



