60 Hordeae 



stalked and Imperfect; rachilla produced beyond the 

 flower. Empty glumes 2, all alike and subulate; 

 flowering glumes narrow Lanceolate, rounded on the 

 back, rigid, persistent, obscurely 5-nerved above, usually 

 awned. Palea nearly equaling the glume, 2-keeled. 

 Stamens 3. Styles very short, distinct. Grain usually 

 adherent to the glume, hairy at summit. 



1. H. nodosum L. Perennial; culms erect, slender. 2-6 dm. 

 high, sheaths glabrous; leaves often deflexed, flat, scabrous, 5-8 

 nun. wide; spike slender, compressed, usually nodding, 6-10 cm. 



8-10 mm. wide; rachis very brittle ; lateral spikelets awn- 

 less, staminate or neutral: flower of central spikelei sessile; 

 empty glumes not flattened or dilated above the base, all alike 

 and sui hi late; flowering glume including its awn L4-18 nun. long; 

 awn usually brownish or purplish. 

 Frequent inmoisl places in all our valleys. 



2. H. nodosum depressum Scribn. & Smith. Lower ami more 

 tufted than the type; culms geniculate at the base or erect , 1-.*! 



dm. high : upper sheaths inflated : leaves shorter than in the type, 

 usually pubescent; empty glumes L8 mm. long; fertile flowering 

 glume with an awn equaling its own length. 



Occasional in marshes along the coast. Resembling the next in habit. 



3. H. maritimum L. Annual, rather glaucous; culms more 

 or less decumbent at base, tufted. 1-2 dm. high; spikes 2-4 cm. 

 long, rather pale; lateral spikelets neutral or sometimes slami- 

 nate, their inner empty glumes obliquely lanceolate, l mm. wide; 

 Eertile (lower sessile. 



Occasional alonu' the coast. SanDiego. 



4. H. Gussoneanum Pari. M ueh resembling the last in habit , 

 but the inner empty glumes only narrowly flattened instead 

 of wing margined along the inner side. 0.5 nun. wide. 



Occasional a Ion I mai shes. 



5. H. murinum L. Annual ; culms tufted, decumbent at base, 

 2-5 dm. high; upper sheaths smooth, scariotis on the margins, 



often dilated, the Lowerpilose; leaves softly pubescent and sca- 

 brous; spikes stout, compressed, 5-10 cm. long; central spikelet 



pedicelled ; empty glumes lanceolate, flat, filiate ; awns 18-24 mm. 



