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



to Alaska, south to New Mexico and California; introduced in several 

 localities in the Eastern States (fig. 525); also in southern South 

 America, and widely dispersed in the Old World. HORDEUM NODO- 

 SUM var. BOREALE (Scribn. and Smith) Hitchc. As much as 1 m 

 tall; blades as much as 8 mm wide; florets of lateral spikelets larger, 



sometimes as large as the 

 floret of the central spikelet. 

 Intergrading with H. nodo- 

 sum. QJ. (H. boreale Scribn. 

 and Smith.) Near the coast, 

 Alaska to Idaho and north- 

 ern California. 



4. Hordeum pusillum 

 Nutt. LITTLE BARLEY. 

 (Fig. 526.) Annual; culms 

 10 to 35 cm tall; blades 

 erect, flat; spike erect, 2 to 

 7 cm long, 1 to 1 4 mm wide ; 

 first glume of the lateral 

 spikelets and both glumes 

 of the fertile spikelet dilated 

 above the base, attenuate 

 into a slender awn 8 to 15 

 mm long, the glumes very 

 scabrous; lemma of central 

 spikelet awned, of lateral 

 spikelets awn-pointed. O 

 Plains and open, espe- 

 cially alkaline, ground, Del- 

 aware to Washington, south 

 to Florida, sou them Califor- 

 nia, and northern Mexico; 

 also Maine; common west- 

 ward, rare in the Atlantic 

 States ; also southern South 

 America (fig. 527). HOR- 

 DEUM PUSILLUM var. PUBENS Hitchc. Spikes broader; spikelets pu- 

 bescent; dilated glumes wider. 01 Texas to Utah and Arizona. 



5. Hordeum gussoneanum Parl. MEDITERRANEAN BARLEY. 

 (Fig. 528.) Annual; culms freely branching and spreading or genicu- 

 late at base, 15 to 40 cm tall; sheaths and flat blades, especially the 

 lower, more or less pubescent; spike erect, 1.5 

 to 3 cm long, 10 to 15 mm wide; glumes seta- 

 ceous, nearly glabrous to scabrous, about 12 

 mm long; lemma of central spikelet 5 mm long, 

 the awn somewhat longer than the glumes; 

 floret of lateral spikelets reduced, short-awned. 



O Fields and waste places, Utah to Brit- FIGURE 523. Distribution of 

 ish Columbia, Arizona, and California; Mas- Hordeum jubatum. 



sachusetts, New Jersey (fig. 529); introduced from Europe. 



Hordeum marinum Huds. Differing from H. gussoneanum in the 

 glabrous dissimilar glumes of the lateral spikelets, the outer subulate, 

 the inner somewhat broader. (H. maritimum With.) On 

 ballast, Camden, N. J. ; Europe, 



FIGURE 522. Hordeum jubatum, X 1. 

 Mont.) 



(Blankinship 189, 



