264 POACE^. 



mostly single, capillary, with very slender scattered spreading 

 branches. Spikelets on pedicels ii-10 mm. long, empty glumes 

 subequal, ovate, obtuse or acute, obscurely 1-nerved, about 1.3 mm. 

 long ; floral glume linear when spread, finely pubescent on the 3 

 nerves, 3 mm. long, minutely 2-toothed, the awn 0.5-1 mm. long; 

 palea linear, nearly as long as its glume. 



Mexico, Pringle 403 ; Arizona, Fringle. 



Arizona and Mexico. 



51. M. affinis Trin. Fund. Agrost. 3:55 (1841). Mem. Acad. 

 St. Petersb. (VI.) 6, 2: 291 (1845). 



. Culms hard, scabrid, simple, erect, 60-90 cm. high, from peren- 

 nial tufts. Sheaths longer than the internodes; ligule firm, 3 mm. 

 long; blades light-colored, scabrous above, becoming involute. 20- 

 40 cm. long, 2-3 mm. wide, with long setaceous points. Panicle 

 purple, slender, narrow or open, 30-30 cm. long, rays finely capil- 

 lary, in rather distant pairs, the longest 10 cm. long, sparingly 

 branched, flower-bearing above the middle. Spikelets on pedicels 

 8-20 mm. long; empty glumes equal, ovate, apex variable, obscurely 

 1-nerved, about 1 mm. long; floral glume pencil-tufted at base, 

 scabrid, linear-lanceolate, 3-nerved, 4 mm. long, awn 10-30 mm. 

 long; palea linear, very nearly as long as its glume. Nearly allied 

 to M. Palmeri Vasey and M. Berlandieri. 

 Mexico, Palmer 523, 954. 



52. M. implicata (Willd.) Trin. TJnifl. 193 (1824). Agrostis 

 imjjlicata Spreng. Syst. 1:303 (1835). Podoscemum imjMcatuin 

 H. B. K. Nov. Gen. et Sp. 1: 127 (1815). Tricliocliloa implicata R. 

 & S. 2:385 (1817). 



A slender, rather soft, purplish, branching annual (?), 50-70 cm. 

 liigh. Sheaths about as long as the internodes; ligule thin, 1.5-3 

 mm. long; blades conduplicate or flat, scabrous above. 10-15 cm. 

 long, 1.5 mm. wide. Panicle thin, slender, ovate-lanceolate, 15-30 

 cm. long, rays single with spreading capillary branches, few- 

 flowered. Spikelets on very slender flexuose, curved pedicels, 

 which are 5-10 mm. long; empty glumes broad, truncate, erose, 

 second 1-nerved, about 0.5 mm. long and longer than the first one; 

 floral glume linear-lanceolate, scabrid, 3-nerved, 4 mm. long, in- 



