184 GRAMIXEAE 



1. H. jubatum L. Perennial; eulms erect, or deeuiiibent at base, ] to 2 feet 

 high ; blades 21/0 Hues wide, scabrous ; spike uodding, 2 to 4 iuches 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 2^1> 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 ilountain 

 region. 



Loes. — Honey Lake Valley, Ihny 3209; .Suisuii iiiarslies. Ddiy 4118; Lancaster, Elmer S'MS; 

 San Bernardino Mts.. Parish Brof:. 1540. 



Refs.— HORDEUM JUBATUM L. Sp. PI. 85. 17.13; Tlunb. in Wats. Bot. Cal. 2: 32.5. 18S0. 



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

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

 abortive, the first glume of each an<l lioth glumes of the fertile spikelet dilated 

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

 scabrous; lemma luiawned. 



Plains and oi)en, especially alkaline ground: San Diego, Baker 3682, Orciitl 

 1175; Santa Catalina Island, I'lask: north to Idaho and eastward to Ohio. 

 Eef. — HoRDEUM PUSILLUM Nutt. Gen. PI. 1: 87. ISIS. 



3. H. nodosum L. Similar to IT. 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. 



Refs. — HoRDEUM NODO.su.\l L. Sp. PI. ecL 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, U. S. Dept. -\gr. Div. Agrost. Bull. 4: 24. 1S97; Abrams, Fl, Los 

 .\ng. 60. 1004. 



4. H. gussoneanum I'arl. Annual; mlms mimerous, spreading or genicu- 

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

 more or less pubescent; spike erect, oblong. V^ to 11-; inches long. 3 to 5 lines 

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

 1/^ inch long; lenmia of lateral spikelets snuill. narrowed into an awn about '[l-j 

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

 than the glumes. 



Fields and waste places, common, north to \'ancouver Island and east to 

 Idaho ; introduced from Europe. 



Refs. — HoRDEUM GUSSONEANUM Pari. Fl. Palerm. 1: 246. 1S45; Abrams, Fl. Los Ang. 60. 

 1904. H. maritimiim With. var. gussoiiraiium Richt. PI. Eur. 1: 131. 1890; Davy in .Tepson, 

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

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



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

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

 most inflated sheath; glumes of the central spikelet narrowly spindle-forni. 

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

 long; glumes of the lateral spikelets uidikc. 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 ghuiu's. 



Fields waste places, and o|)en ground, tbrougbout Ibe state, north to Van- 

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

 introduced from Europe. 



Befs. — HoRDEUM MUKIXUM L. Sp. I'l. S5. 1753; Tlmrb. in Wats. Bot. Cal. 2: 325. IssO; 

 Davy in .Jep.son, Fl. W. Mid. Cal. S3. 1901 ; Abrams, Fl. Lns Ang. 60. 1904. 



