AGROSTIDE^. 265 



•cludiug the 2 slender bristles; awn very slender, 10-20 mm. long; 

 palea lanceolate, acute, nearly as long as its glume. Anthers 3 in 

 number, 0.5 mm. long. 

 Mexico, Pringle 818. 



53. M. Palmeri Vasey, Bull. Torr. Club, 13:231 (1886). 



Culms ratlier stout, simple, erect, 65-120 cm. high, from creep- 

 ing rootstocks. Ligule firm, 2 mm. long; blades firm, scabrous 

 above, becoming involute or conduplicate, 30-60 cm. long, the 

 point setaceous. Panicle often purple, erect, spikelike, 18-30 cm. 

 long, 1-2 cm. diam., rays very numerous, erect, mostly flower- 

 Ijearing to the base. Spikelets on pedicels 1-4 mm. long; empty 

 glumes subequal, 1-nerved, about two-thirds as long as the florets, 

 including the awn-point; floral glume scabrous, oblong-lanceolate, 

 3-nerved, about 4 mm. long, apex 2-toothed with an awn 4-6 mm. 

 long; palea scabrous, linear, acute, as long as its glume. Nearly 

 allied to M. affinis Trin. 



Mexico. PriNf/h' 1417. 



54. M. pauciflora IJuckl. Proc. Phila. Acad. 91 (1862). 



An erect perennial, rather sparingly branched for the whole 

 length, 50 cm. high; culms hard, scabrid, nodes tumid; sheaths 

 mostly shorter than the internodes, some of them crowded off by 

 the branches: ligule laseerate, 1-1.5 mm. long; blades of the culms 

 smooth on the lower side, rather setaceous, 6-10 cm. long, those 

 near the roots few and short. Panicle spikelike, slenc|er, 6-8 cm. 

 long, rays mostly single, appressed, flower-bearing to the base, the 

 longest 2 cm. long. Spikelets on very short pedicels, empty glumes 

 equal, lanceolate, 1-nerved, 2.5 mm. long; floral glume with a few 

 short hairs at the base, linear-lanceolate, 3-nerved, nearly 4 mm. 

 long, the awn 8-12 cm. loug; palea linear, 4 mm. long. 



Much like M. Keo-Mexicana, of which it is jjerhaps only a 

 variety. 



Arizona, Xealleij in 181)1. 



55. M. Neo-Mexicana Vasey, Coult. Bot. Gaz. 11:337 (1886). 

 An erect perennial, branching near the base. Culms hard, 



scabrous, 30-60 cm. high. Sheaths longer than the internodes; 



