2R4 I'OACEvE. 



mostly sin^'lo. capillary, with very sloiulcr scattered spreadiii": 

 branches. Spikelets on pedicels "-.'-lO mm. long, empty glumes 

 subequal, ovate, obtuse or acute, obsourely 1-uerved, about 1.3 mm. 

 long; tloral glume linear when s])read, tinely pubescent on the 3 

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

 palea linear, nearly as long as its glume. 



Mexico, PriiKjlo Ai)'i\ Arizomi, I 'riii(/Ie. 



Arizona and Mexico. 



51. M. affinis Trill. Fund. Agrost. 2:55(1841). Mem. Acad. 

 St. Tetersb. (VI.) 0. 2:391 (1815). 



Culms hard, scalirid, simple, erect, GO-00 cm. high, from peren- 

 nial tufts. Sheaths longer than the internodes; ligiile lirm. 2 mm. 

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

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

 l)urp[e, slender, narrow or open, 20-30 cm. long, rays finely (^ai)il- 

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

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

 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-iierved, 4 mm. long, awn 10-20 mm. 

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

 to M. Palmeri Vasey and .)/. lierlandieri. 



Mexico, Palmer 522. 954. 



52. M. implicata (Wilhl.) Triii. Uuifi. 193 (1824). Af/rns/is 

 impUmta Spreng. Syst. 1 : 2(i2 (1S25). Podnxivinuin. impJicatiDii 

 11. n. K. Xov. (kMi. et Sp. 1: 127(1815). Trichochloa inipUcala K. 

 it S. 2:385 (1817). 



A slender, rathersoft, pur})lish, braiieiiing annual (?), 50-70ciii. 

 high. Sheaths about as long as the internodes; ligule thin. 1.5-2 

 mm. long; blades coiidu[)licate or flat, scabrous above. 10-15 cm. 

 long, 1.5 mm. wide. Panicle thin, slender, ovate-lanceolate. 15-20 

 via. long, rays single with sjjreading capillary liranches. few- 

 ilowered. 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 flrst one; 

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



