AVKNEiK, 383 



2. A. Hookeri Scribn. Hack. True CJrasses 123 (1890). A. ver- 

 sirnliir Hook. Fl. IJor. Am. 2 : (1840), not \'ill. A. pralensis L. var. 

 AiiK't-irana^cYihw. Coult. liot. Gaz. 11:177 (188(1). 



An erect smooth perennial, 30-40 en. high. Ligule ovate, 

 acute; blades narrow, 5-20 em. long. Panicle simple, 8 em. long, 

 2 cm. broad. Spikelets erect, shining, 4-5-tlo\vered; empty glumes 

 lanceolate, subequal, 3-nerved, scarious above, about as long as the 

 spikelet; floral glume lanceolate or oval-lanceolate, 12 cm. long, 

 lower part scabrid, the up])er scarious, 5-nerved, awn near the mid- 

 dle, reaching 1 cm. above its glume; upper florets gradually shorter; 

 palea oblanccolate, two-thirds as long as its glume, keels ciliate. 



Mo)\tana, Scribner, Williaiiis 581; Yellowstone Park, Tiret>(hj; 

 Saskatchewan, Bourfjeaii; N. Trans. Cont. 8urv., Canby tk, Scrib- 

 ner 3T2. 



Montana and British America. 



3. A. lURHATA Brot. Flor. Lusit. 1: 108 (1804). A. hirsnta 

 Roth. Cat. 3: 19 (180G). A. athemnthera Presl. Cyp. et Gram. Sic. 

 30 (182G). yl.>//^r^ Viv. Fl. Lib. Spec. 0(1824). A. seyotaJ'iH 

 liianca, Nym. Consp. 810 (18T8). A. sesquiteria llort. Steud. Noni. 

 Ed. 1:95 (1821). 



An erect glabrous annual, 60-100 cm. high. Leaf-blades sca- 

 brous, flat. 4-25 cm. long, 3-7 mm. wide. Panicle loose, 20-30 

 cm. long, with unequal filiform pedicels, Spikelets 2-flowered, 

 narrow, droo[)ing; empty glumes oval-lanceolate, subequal, about 

 2.5 cm. long, 9-nerved; floral glume membranous, lanceolate, 2.3 

 cm. long (including 2 slender teeth), 5 mm. wide, 7-nerved, hairy 

 below, some of them 5 mm. long, awn starting near the middle, 2-4 

 cm. long, with several firm twists, abruptly bent near the middle; 

 palea oblanccolate, 13 mm. long, 2 mm. wide, the nerves clothed 

 with very short diverging hairs. Much like A. fafua, from which 

 it differs in having a floral glume thinner, narrower, a little shorter, 

 7-nerved, with two shorter teeth, hairs on the back longer and 

 more numerous. 



Lower California, Pahner 668. 



Introduced into Southern California. 



4. A. STERiLis L. Sp. Ed. 2: 118 (1762). Animated Oats. A. 



