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. % (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, 10 to 14 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, southern 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. % — Texas to Utah and Arizona. 



5. Hordeum gussoneanum Pari. 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. 

 G — Fields and waste places, Utah to Brit- 

 ish Columbia, Arizona, and California; Mas- 

 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, 



Figure 523.— Distribution of 

 Hordeum jubatum. 



