HORDEiE. 637 



symmetrical, 7-11 mm. long, first strongly 5-6-nerved, second 7-8- 

 nerved, acute or notched, margins scarious; floral glume about 1 

 cm. loDg, those above shorter, 5-nerved at the cuspidate or short- 

 awned apex. 



Found in Europe, north Africa, Asia, and extensively natural- 

 ized in cultivated grounds in Xorth America. 



Vermont P r ingle ; IMassachusetts, Beal IGl ; Pennsylvania, 

 Scribner for U. S. Bept. Agricul. 767; Michigan, Beal 159, 160, 

 Clark 2310; Iowa, Hiichcoch; Minnesota, Arthnr B 511; Mon- 

 tana, Anderson 9. 



For an extended notice see Vol. I., p. 167, Fig. 76. 



Var. tenenlm (Vasey). A. tenerum Vasey, Coult. Bot. Gaz. 

 10:258 (1885). 



l)estitute of rootstocks; blades usually narrower and shorter 

 and rather more rigid; spike rather more slender, sometimes 

 tinged with purple. After growing patches, from seed obtained 

 from more than one source, in a variety of soils for more than 15 

 years, I am unable to indicate any differences other than those here 

 given to distinguish this from A. repens L. 



A promising grass for cultivation. 



Colorado, Cassidy; Montana, Anderson 37; Arizona, Tourney, 

 Sandbe7-g 2o9, 331; California, Lemmon. 



4. A. glaucum (Desf.) E. & S. Syst. 2: 752 (1817). Trificum 

 glaucum Desf. Tabl. Bot. Mus. 16 (1804). A. repens, various 

 authors, 



A smooth usually glaucous perennial, 30-100 cm. high. Creep* 

 ing rootstocks numerous. Sterile shoots numerous; leaves of the^ 

 culm 3-4 in number, blades 3-12 cm. long, narrow, involute. Spike-' 

 12-14 cm. long, with internodes about 7 mm. long, the lower some- 

 times twice as long. Spikelets occasionally 2 uta node, 2 cm. lonf, 

 5-9-flowered, smooth or rough, florets in the middle of the spike 

 overlapping for three-fourths of their length ; empty glumes nar- 

 rowly lanceolate, first 7 mm. long, 3-nerved, second 10 or more 

 mm. long, 5-nerved, inequilateral; floral glume a little longer 

 than the empty glumes, lanceolate, obtuse, acute or awn-pointed, 

 5-nerved. 



