MACLOSKIE: GRAMINE^E. 191 



nerveless and awnless. Allied to A. alba stolonifera, but distinguished 

 by smaller size, coarctate panicle, smaller spikelets and flowers, and 

 absence of awn. 

 Falklands, rare. 



25. A. PYROGEA Speg. 



Rhizome creeping. Culms long, 30-40 cm., naked. Leaves plane, 

 rather rigid, striate, upper surface somewhat rough, abruptly triangular- 

 acute at apex ; ligules long-lanceolate. Panicle lax, the rays smooth, 

 nude, alternately spiculiferous at the apex. Spikelets ovate, minute, 

 glabrous ; the glumes subequal ; scarcely exceeding the flower, not keeled ; 

 floral ghime enclosing the grain, 5-toothed, with a fine dorsal awh ; palea 

 wanting ; flowers bearded at base. 



S. Patagon., by Lago Argentina ; Fuegia, maritime dunes and sands. 



26. A. RINIHUENSIS Phil. 



Cespitose. Culms 18 cm. tall, sheathed to the panicle. Leaves plane 

 or folded, smooth. Panicle green-violet, 6 cm. long, rays in semi-verticils 

 3-5, spiculiferous at apex. Glumes glabrous ; floral glume one .third as 

 long as the lower, truncate, toothed, hyaline ; the awn arising upward, 

 straight, 6 times as long as the glume. 



Patagon., valley of Rio Rinihue. 



27. A. SANCTACRUZENSIS Speg. 



(Glabrivalvule, bivalvule, microvalvule.) Awnless, all glabrous. Leaves 

 plane, narrow, mediocre, herbaceous; ligules ovate-lanceolate, long. 

 Culms with 2-3 lower nodes sheathed beyond the middle. Panicle laxly 

 subcontracted, narrow, subcernuous, interrupted ; rays moderately long, 

 the shorter erect-appressed, the longer spreading from their base, densely 

 spiculiferous from their base or middle. Spikelets lanceolate, small. 

 Glumes very acute, but not awned, spinulose-scabrid on the keel and 

 sides. Callus obsoletely and very shortly bearded antrorsely. 



S. Patagon., in wet places along Rio Sta. Cruz. 



28. A. SERRANOI Phil. 



Annual. Culm 27-40 cm. tall, the highest internode very long. 

 Leaves plane above, the sheaths roughish. Panicle lax, divaricate ; the 



