184 GRAMINEAE 



1. H. jubatum L. Perennial ; culms erect, or decumbent at base, 1 to 2 feet 

 high ; blades 2 l / 2 li nes wide, scabrous ; spike nodding, 2 to 4 inches long, about 

 an inch wide, soft; lateral pair of spikelets each reduced to 1 to 3 spreading 

 awns; glumes of perfect spikelets awn-like, 1 to 2% inches long, spreading; 

 lemma 3 to 4 lines long with an awn as long as the glumes. 



Open ground, fields and waste places, north to Alaska and east to Ontario 

 and Kansas ; often a troublesome weed in alfalfa fields in the Rocky Mountain 



region. 



Locs. Honey Lake Valley, Davy 3299; Suisun marshes, Davy 4118; Lancaster, Elmer 3618; 

 San Bernardino Mts., Parish Bros. 1540. 



Eefs.- HORDEUM JUBATUM L. Sp. PI. 85. 1753; Thurb. in Wats. Bot. Cal. 2: 325. 1880. 



2. H. pusillum Nutt. Annual; culms 4 to 15 inches high; blades erect, flat; 

 spike erect, 1 to 3 inches long, 5 to 7 lines wide; lateral pair of spikelets 

 abortive, the first glume of each and both glumes of the fertile spikelet dilated 

 above the base, attenuate into a slender awn 4 to 7 lines long; glumes very 

 scabrous ; lemma unawned. 



Plains and open, especially alkaline ground; San Diego, Baker 3682, Orcutt 

 1175 ; Santa Catalina Island, Trask; north to Idaho and eastward to Ohio. 

 Eef. HORDEUM PUSILLUM Nutt. Gen. PI. 1: 87. 1818. 



3. H. nodosum L. Similar to H. pusillum, but usually taller; all the glumes 

 awn-like. 



Fields, waste places, and open ground throughout the state, north to Alaska 

 and east to Indiana ; introduced from Eurasia and abundantly naturalized. 



Eefs. HORDEUM NODOSUM L. Sp. PI. ed. 2. 1: 126. 1762; Thurb. in Wats. Bot. Cal. 2: 325. 

 1880; Davy in Jepson, Fl. W. Mid. Cal. 82. 1901; Abrams, Fl. Los Ang. 60. 1904. Var. 

 depressum Scribn. & Smith, TJ. S. Dept. Agr. Div. Agrost. Bull. 4: 24. 1897; Abrams, Fl. Los 

 Ang. 60. 1904. 



4. H. gussoneanum Parl. Annual; culms numerous, spreading or genicu- 

 late at base, 6 to 15 inches high ; sheaths and flat blades, especially the lower, 

 more or less pubescent ; spike erect, oblong, y 2 to 1% inches long, 3 to 5 lines 

 wide, rounded at base ; glumes setaceous, glabrous or minutely scabrous, about 

 l /2 inch long ; lemma of lateral spikelets small, narrowed into an awn about 1 y? 

 lines long; lemma of central spikelet 2~y 2 lines long, the awn somewhat longer 

 than the glumes. 



Fields and waste places, common, north to Vancouver Island and east to 

 Idaho ; introduced from Europe. 



Eefs. HORDEUM GUSSONEANUM Parl. Fl. Palerm. 1: 246. 1845; Abrams, Fl. Los Ang. 60. 

 1904. H. maritimum With. var. gussoneanum Eicht. PI. Eur. 1: 131. 1890; Davy in Jepson, 

 Fl. W. Mid. Cal. 83. 1901. H. maritimum With, is mentioned by Abrams as growing along the 

 coast at San Diego (Fl. Los Ang. 60. 1904). 



5. H. nmrinum L. Annual; culms bushy-branched, spreading ; sheaths and 

 blades smooth ; spike 2 to 3 inches long, often partially enclosed by the upper- 

 most inflated sheath; glumes of the central spikelet narrowly spindle-form, 

 3-nerved, long-ciliate on both margins, the nerves scabrous ; awn about an inch 

 long; glumes of the lateral spikelets unlike, the inner similar to the central, 

 the outer setaceous, not ciliate ; lemmas all broad, 4 to 5 lines long, the awns 

 somewhat exceeding those of the glumes. 



Fields waste places, and open ground, throughout the state, north to Van- 

 couver Island and east to Idaho and New Mexico, rare in the Eastern States; 

 introduced from Europe. 



Eefs. HORDEUM MURINUM L. Sp. PI. 85. 1753; Thurb. in Wats. Bot. Cal. 2: 325. 1880; 

 Davy in Jepson, Fl. W. Mid. Cal. 83. 1901 ; Abrams, Fl. Los Ang. 60. 1904. 



