340 POACEiE. 



Oregon, IIowelL Scribner, Henderson. 

 Washington and Oregon. 



3. C. Orizabae (Eupr.) Steud. Syn. PL Gram. 193 (1855). 

 Beyeuxia Orizahw Eupr. Bull. Acad. Brux. 9, part 2:233 (1842). 



A slender erect tufted perennial, about 90 cm. high. Sterile 

 shoots numerous, the blades conduplicate, 40-60 cm. long, 0.5 mm. 

 diam., those of the culm 2 in number; sheaths smooth; ligule very 

 short; blades 5-10 cm. long. Panicle slender, thin, drooping, 10-15 

 cm. long, rays mostly in tlirees, rather distant, the longest 6-8 cm. 

 long, sparingly branched and flower-bearing on tlie outer half. 

 Spikelets linear, 4 mm. long; empty glumes and floral glume 

 equal, first glume 1-nerved, second 3-nerved; floral glume oval 

 when spread, obtuse, tuft of hairs very short, awn one-third the 

 way below the apex and projecting about 1 mm., rudiment 1.5 mm. 

 long; palea linear, hyaline, 3 mm. long. 



Mexico, rringle 4243; found 12000-14000 feet above the. sea- 

 level. 



4. C. erecta. C. plumosa (Fourn.) Seribn. ined. AchcBta 

 plumosa Fourn. Mex. PI. Enum. Gram. 109 (1886). 



An erect tufted perennial, 60-80 cm. high. Sterile shoots 

 numerous, the blades involute, filiform, 30-40 cm. long, 0.3-0.6 

 mm. diam., those of the culm 3 in number, the sheath of the middle 

 one smooth, two-thirds as long as the internode; ligule, 3 mm. long; 

 blades 10-15 cm. long, the upper blade shorter. Panicle purple, 

 slender, thin, slightly drooping, 10-14 cm. long, rajs mostly in 

 pairs, the longest 3-5 cm. long, bearing spikelets on the outer two- 

 thirds. Spikelets linear-lanceolate, 5.5 mm. loug; empty glumes 

 equal, first 1-nerved, second 3-nerved; floral glume pubescent when 

 seen under a lens, 4.5-4.7 mm. long, truncate-tootlied; awn 0.5-1 

 mm. long, attaclied but little below the apex of its glume; rudiment 

 puberulent, 2.1 mm. long; palea hyaline, 3.5 mm. long. 



The specific nsmie plumosa under Calamagrostis had been used 

 by Spreng, hence the new name here given. 



Mexico, Pringle 4726, found under pines at an altitude of 

 10,400 feet. 



5. C. Suksdorfii Seribn. Bull. Torr. Club, 15:9 (1888). Dey- 



