246 



POACEAE 



3. Hordeum gussoneanum Pari. 

 Mediterranean Barley. Fig. 583. 



Hordeum gussoneanum Pari. Fl. Palerm. 1: 246. 1845. 

 Hordeum maritimum gussoneanum Richt. PI. Eur. 1: 131. 



Annual ; culms numerous, spreading or geniculate 

 at base, 15-40 cm. tall; sheaths and flat blades, especi- 

 ally the lower, more or less pubescent ; spike erect, 

 oblong, 1.5-3 cm. long. 6-10 mm. wide, rounded at 

 base ; glumes setaceous, glabrous or minutely sca- 

 brous, about 12 mm. long; lemma of lateral spikelets 

 small, narrowed into an awn about 3 cm. long; lemma 

 of central spikelet 5 mm. long, the awn somewhat 

 longer than the glumes. 



Fields and waste places, introduced from Europe. British 

 Columbia to southern California, east to Idaho. May-Aug. 

 Type locality, European. 



4. Hordeum depressum (Scribn. & Smith) 



Rydb. 

 Low Barley. Fig. 584. 



Hordeum nodosum dej^ressum Scribn. S: Smith, U. S. Dept. Agr. 



Div. Agrost. Bull. 4: 24. 1897. 

 Hordeum depressum Rydb. Bull. Torrey Club 36: 539. 1909. 



Annual ; culms erect or geniculate below, smooth, 

 10-30 cm. tall; sheaths cmooth or pubescent, the lower 

 papery; blades flat, pubescent on both surfaces, 2-10 

 cm. long. 2-3 mm. wide ; spike 2-4 cm. long ; glurnes 

 1.5-2 cm. long, subulate, scabrous; lemma of the lateral 

 spikelets awnless ; central spikelets about as in H. 

 nodosum, but the awns longer. 



Open ground, Washington (Adams County, Cotton; Colum- 

 bus, Suksdorf), Oregon (l^exington, Leiberg), California (Yolo 

 County, Heller), Idaho and Arizona, rare. Apr.-May. Ty|)e 

 locality: near Lexington, IMorrow County, Oregon. 



5. Hordeum jubatum L. 



Squirrel Tail. Fig. 585. 



Hordeum jubatum L. Sp. PI. 85. 1753. 



Perennial ; culms erect, or decumbent at base, 

 30-60 cm. tall; blades 5 mm. wide, scabrous; spike 

 nodding. 5-10 cm. long, about 2 cm. wide, soft ; 

 spikelets lateral, each reduced to 1-3 spreading awns ; 

 glumes of perfect spikelets awn-like, 2.5-6 cin. long, 

 spreading; lemma 6-8 mm. long with an awn as 

 long as the glumes. 



Open ground, fields and waste places, in the Arid Tran- 

 sition and U])per Sonoran Zones; Alaska to California, east 

 to Ontario and Kansas, and sparingly further east. June- 

 Aug. Type locality: Canada. 



