162 



o7. GRAMIXE.E. 



Buffalo-giass (Australia); St. Audiistine-ffrass (U.S.A.)- 

 Glabrous perennial, Avith creeping rootstock and ascending 

 stems; leaves keeled, blade blunt, sheath flattened, ciliate 

 near summit ; spike solitary, 

 terminal, erect, 1 - sided ; 

 spikelets twin, in 2 rows, 

 embedded in the alternate 

 notches of the broad thick 

 axis, the lower spikelet ses- 

 sile, the upper on a thick, 

 awned pedicel ; oviter glumes 

 membranous, very unequal, 

 the lower one minute, the 

 upper 7-nerved, as long as the 

 floweivs, of which each spike- 

 let has 2, the first male, the 

 second bisexual ; anthers 

 orange, stigmas plumose, 

 purplish. 



A lawn-gras.s, spontaneous 

 here and there, especially in 

 sandy places. — Dec. - Mar. — 

 Warm parts of America and 

 Africa. 



5. HORDEUM, L. 



Stenotaphrum ameri 

 canum. 



Spikelets subcylindrical, 



arranged in 3"s in the alter- 

 nate notches of the fragile 



axis, forming a dense, cylindrical spike; outer glumes 2, 

 subequal, narrow, awned, the 6 placed side by side before 

 the 3 spikelets so as to resemble a half-involucre ; flowering 

 glume convex, 5-nerved, long-awned ; palea 2-nerved and 

 bifid; all the awns denticulate and rough downwards; 

 grain oblong, hairy at summit, channeled on the inner face, 

 adhering to the flowering glume and pale. 



Loaf-sheaths glabrous; floworiiig- glumes 



with an awn much longer than the outer 



glumes 



Leaf-sheaths downy ; flowering glumes of the 



lateral spikelets with an awn much 



.shorter than the outer glumes 



H. Ill uri II II III 1 



H, iiiariti iiiuiii 2 



I. Hordeum murinum, !>. Burlry-ijrass. An- 

 nual, with short, leafy, tufted, ascending stems; leaf blades 

 flat, villous, sheathiS glabrous ; spikelets pedicellate, the 

 central one with a bisexual flower, the lateral ones with 

 a barren flower ; the 4 central empty glumes linear- 

 lanceolate, ciliate, (the 2 inner oiics .sessile), the 2 outer- 

 most reduced to awn,s and not ciliate; flowering glume 



