158 



POACEAE 



4. Calamagrostis tweedyi Scribn. 

 Tweedy's Reed-grass. Fig. 352. 



Deyeuxia tweedyi Scribn. Bull. Torrey Club 10: 64. 18S3. 

 Calamagrostis trvcedyi Scribn. Contr. U. S. Nat. Herb. 3: 83. 

 1892. 



Culms 1-1.5 meters tall, smooth, bearing short 

 rhizomes ; sheaths smooth, the lower becoming fibrose ; 

 blades flat, somewhat scabrous, the cauline 5-15 cm. 

 long, as much as 1 cm. wide, those of the innovations 

 narrower and longer ; panicle oblong, rather compact, 

 or interrupted below, about 10 cm. long; glumes ab- 

 ruptly acuminate, purplish tinged, about 7 mm. long; 

 lemma about as long as the glumes, the awn exserted 

 about 5 mm., the callus hairs scant, scarcely 1 mm. 

 long ; rudiment pilose, 3 mm. long. 



Only known from the Cascade Mountains, Washington, the 



tyi)e locality. 



\-.li\ 



5. Calamagrostis foliosa Kearn. 

 Leafy Reed-grass. Fig. 353. 



Calamagrostis svlvatica longifolia Vasey, Contr. U. S. Nat. Herb. 



3: 83. 1892. 

 Calamagrostis foliosa Kearn. U. S. Dept. Agr. Div. Agrost. Bull. 



11: 17. 1898. 



Culms cespitose. erect, 30-60 cm. tall ; leaves mostly 

 basal, numerous, the blades involute, firm, smooth, 

 nearly as long as culm ; panicle dense, spikelike, 5-8 

 cm. long ; glumes about 1 cm. long, acuminate ; lemma 

 5-7 mm. long, acuminate, 4-nerved, the nerves ending 

 in setaceous teeth ; awn from near base, geniculate, 

 about 8 mm. long above the bend; rudiment pilose, 

 nearly as long as lemma ; callus hairs numerous, 3 mm. 

 long. 



Humboldt and Mendocino Counties, California. August. 

 Type locality: Humboldt County. 



6. Calamagrostis purpurascens R. Br. 

 Purple Reed-grass. Fig. 354. 



Calamagrostis purpurascens R. Br. in Richards. Hot. App. 

 Frankl. Journ. 731. 1823. 



Calamagrostis svlvatica purpiirascens Vasey, Contr. U. S. Nat. 

 Herb. 3: 83." 1892. 



Culms cespitose, erect, 40-60 cm. tall ; sheaths 

 scabrous ; blades flat or more or less involute, scabrous ; 

 panicle dense, spikelike, 5-12 cm. tall, pale or some- 

 times purple ; glumes 6-8 mm. long, scabrous ; lemma 

 nearly as long as glumes, 4-nerved, 4-awned at apex, 

 the dorsal awn from near base, finally geniculate, 

 exserted about 2 mm. 



Rocks and cliflfs, Arctic regions to California and Colorado, 

 Hudsonian and Canadian Zones. August. Type locality: 

 British America. 



