102 
B. Awn included in the spikelet or slightly exceeding it. 
a. Culm with 2—3 elongated joints. 
a. Glumes ovate-lanceolate, acute. 
junGlumessabouteopmmenlOn gear medi) ieee: cence sen <a detts C. confinis. 
2 /Glumes about 3—Asmm elon gen: ra «eels elie site, (ol eile C. neglecta. 
8. Glumes lanceolate, acuminate. 
1. Glumes scabrous on the dorsal vein. 
* Glumes about 7 mm. long. Pale with a short awn from above 
TOYS JHU! 2cr Qo) cup a GEOrrMCRG ELS ole te bla Geo de C. cinnoides. 
** Glumes about 7 mm. long. Pale with a short straight awn from 
belowathesmiddlerncyarsys ycasteney cas (inition sash enatensp = C. strigosa. 
2. Glumes glabrous, shining. 
* Glumes about 5 mm. long. Pale with a bent awn from below the 
middle, sometimes slightly exceeding the spikelet 
C. deschampsioides. 
** Glumes about 3—4 mm. long. Pale with a short awn from above 
(ute grits (allOrs quale cuoetio ny aio Blo orci taretericvo oo c C. Holmii. 
b. Culm with 4—6 elongated joints. 
a. Glumes about 5 mm. long. Ligules 7—10 mm. long. . . C. Langsdorfii. 
8. Glumes about 2 mm. long. Ligules short.......... C. canadensis. 

6. 7. 8. q 
Fig. 79. Spikelets of Calamagrostis. 1. C. arundinacea, 2. C. confinis, 3. C. neglecta, 4. C. cinnoides, 
5. C. strigosa, 6. C. deschampsioides, 7. C. Holmii, 8. C. Langsdorfii, 9. C. canadensis 
(About 3 times enlarged). 
162. C. arundinacea (L.) Roth. 
C. silvatica D. C., Trautv. Syll. Pl. Sib. bor. orient. p.544, Fl. rip. 
Kolym. p. 572; C. purpurascens R. Br. in Richardson Bot. App. p. 731; 
Hook. Fl. bor. Am II p. 240; Lge. Consp. Fl. Groenl. p. 160; Hartz, 
Nordést Grénl. p. 348; Dusén, Ost Groénl. p. 58; FI. D. tab.2523; C. hyper- 
borea Dusén 1. c. p. 58, non Lge. 
Glumes lanceolate, acuminate, with scabrous dorsal vein, the rest 
glabrous or with very short hairs. Pales about equal, almost as 
