6Q 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 

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

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

 less, staminate or neutral; flower of central spikelet sessile; 

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

 and subulate; flowering glume including its awn 14-18 mm. long; 

 awn usually brownish or purplish. 



Frequent in moist places in all our valleys. 



2. H. uodosum depressum Scribn. & Smith. Lower and more 

 tufted than the type; culms geniculate at the base or erect, 1-3 

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

 usually pubescent; empty glumes 18 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 24 cm. 

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

 nate, their inner empty glumes obliquely lanceolate, 1 mm. wide; 

 fertile flower sessile. 



Occasional along the coast. San Diego. 



4. H. Gussoneanum Parl. Much resembling the last in habit, 

 but the inner empty glumes only narrowly flattened instead 

 of wing-margined along the inner side, 0.5 mm. wide. 



Occasional along the coast marshes. 



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

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

 often dilated, the lower pilose; leaves softly pubescent and sca- 

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

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



