272 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



ceolate, 3-nerved, long-ciliate on both 

 margins, the nerves scabrous, the 

 awn 2 to 2.5 cm. long; floret 1 to 1.2 

 cm. long, raised on a rachilla segment 

 1 mm. long, the awn 3 to 4 cm. long; 

 lateral spikelets usually staminate, 

 the glumes much shorter, unlike, the 

 inner similar to those of the central 

 one, the outer setaceous, not ciliate, 

 the lemma broad, 10 to 20 mm. long, 

 the awn 2 to 4 cm. long. O — 

 Weed, fields, waste places and open 

 ground, introduced from southern 

 Europe; here and there in the Eastern 

 States, Massachusetts to Georgia; 

 Vancouver Island and Washington to 

 California, Utah, and Texas. This 

 and H. stebbinsii have been confused 

 with H. murinum L., of Europe, not 

 known from America. 



re 367. — Hordeum hystrix, X 

 (Hitchcock 2688, Calif.) 



8. Hordeum hystrix Roth. Medi- 

 terranean barley. (Fig. 367.) An- 

 nual; culms freely branching and 

 spreading or geniculate at base, 15 to 

 40 cm. tall; sheaths and blades, espe- 

 cially the lower, more or less pubes- 

 cent, the auricle wanting; spike erect, 

 1.5 to 3 cm. long, 10 to 15 mm. wide, 

 the axis usually not readily breaking; 

 glumes setaceous, rigid, nearly gla- 

 brous to scabrous, about 12 mm. long; 

 lemma of central spikelet 5 mm. long, 

 the awn somewhat longer than the 

 glumes; floret of lateral spikelets re- 

 duced, short-awned. O (H. gus- 

 sonianum Pari.) — Fields and waste 

 places, Utah to British Columbia, 

 Arizona, and California; adventive 

 in Massachusetts, New Jersey, and 

 Pennsylvania; introduced from Eu- 

 rope. 



Hordeum marinum Huds. Differing 

 from H. hystrix in the glabrous dis- 

 similar glumes of the lateral spikelets, 

 the outer subulate, the inner some- 

 what broader. O {H. maritimum 

 With.) — On ballast, Camden, N. J.; 

 Europe. 



9. Hordeum leporinum Link. (Fig. 

 368.) Annual; branching at base, 

 spreading; sheaths glabrous, blades 

 pilose to glabrous; auricle at base of 

 blade well developed; spike 5 to 9 

 cm. long, often partly enclosed by 

 the inflated uppermost sheath, the 

 rachis internodes mostly 3 mm. long; 

 glumes of the central spikelet lan- 



Figure 368. — Hordeum le- 

 porinum, X 1. (Mills- 

 paugh 4629, Calif.) 



10. Hordeum stebbinsii Covas. 

 Similar to the preceding, the culms 

 often shorter and more geniculate; 

 spikes narrower, mostly 9 to 15 mm. 

 wide before beginning to break up, 

 the triads closely ascending and 

 slightly more crowded, the rachis 

 internodes mostly 2 mm. long; florets 

 of lateral spikelets not larger than 

 that of the middle spikelet; all awns 

 mostly shorter and slightly more 



