165 



FIG. 133. Hordeum boreale Scribn. & Smith. NORTHERN WILD BARLEY.— 

 a, A group of 3 spikelets, the lateral ones raised on short pedicels; b, the cen- 

 tral floret; c, an expanded lateral floret. Other species of Hordeum are illus- 

 trated by figs. 603 to 610, in Bui. 17. 



133. HORDEUM Linn. Sp. PI. 84. 1753. Spikelets 1-flowered, 2 to 3 together 

 at each joint of the articulate rachis, sessile or on very short pedicels; rachilla 

 articulated above the empty glumes and continued behind the palea of the 

 central spikelet into a naked bristle which sometimes bears the rudiment of 

 a 2d floret. Empty glumes 2, narrow-lanceolate, subulate or setaceous, rigid, 

 persistent; flowering glumes lanceolate, rounded on the back, obscurely 

 5-nerved above, usually awned; palea shorter than the glume, 2-keeled. Sta- 

 mens 3. Styles very short, distinct. Ovary hairy at the top. Grain sulcate, 

 adherent to the palea. Lateral spikelets usually imperfect and raised above 

 the central one. Annual or perennial grasses, with terminal* cylindrical spikes 

 and awned spikelets. 



Species about 16, in both hemispheres. 



