FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



cm. excluding setae); rachis pubescent, branches short, contiguous, 

 pubescent, i or rarely 2-flowered; setae 8-12, involucrate, spreading, 



5-12 mm., long, unequal, 



> . / / , slender, tawny, minutely 



\ II / / , / antrorsely barbed. Spikelets 



1.2x2.2 mm., ovate, acute, 

 glabrous. First glume YJ, the 

 length of the spikelet, broad, 

 obtuse, 3-nerved; second ^ 

 the length of the third, broadly 

 ovate, obtuse, 5-nerved, third 

 equal to floral glume, acute, 

 transversely rugose^, 5-nerved, 

 the mid-nerve deeply impress- 

 ed, subtending a hyaline, 

 empty palea of equal length; 

 fruiting glumes 1.3 x 2.1 

 mm., pale stramineous, 

 ellipsoid-ovate, acute, trans- 

 versely rugose. Grain trans- 

 lucent brownish-white, ovate, subacute, ixi.6 mm.; in section plano- 

 convex. 



Hab. Abundant in old fields near Izamal, 2 feet high, June to 

 Dec., Gaunter 756 (Setaria flava Field Col. Mus. Bot. 1:288), Chi- 

 chankanab, 1938. 



Cheetochloa polystachya (Scheele) Scribn. & Merrill, Am. Gras. 

 Bull., 21:37. 



Setaria polystachya Scheele. 



Panicle exserted, 22.5 cm> l n > I -5~ 2 -5 cm - wide; rachis angled, 

 pilose; branches slender, 1-3 cm. long, pubescent; seta? solitary, 

 ascending, 4 lomm. long, flexuous, 

 yellowish green, antrorsely sca- 

 brous. Spikelets oval, obtuse, 

 .9-1 x i. 6-1. 8 mm., glabrous. First 

 glume one-third the length of the 

 spikelet, broad, obtuse, 3-nerved; 

 second shorter than the third, 

 broadly ovate, obtuse, 5-nerved; 

 third equal to floral glume, acute, 

 5-nerved, slightly sulcate, subtend- 

 ing a linear-lanceolate, hyaline * ^t^^^^Y 

 palea; fruiting glumes pale stra- V w5r 

 mineous, ellipsoid, acute, .85x1.5 

 mm., minutely transversely rugose. 

 Grain dull brownish white, ovate, subacute, .65x.g mm., in section 

 plano-convex. 



Hab. In old fields about Izamal, Sept., Gaumer 2478. 



SETARIOPSIS Scribn. Field Col. Mus. Bot. 1:288. 



Inflorescence composed of sub-spicate panicles; primary and sec- 

 ondary branches prolonged beyond the Spikelets into slender awn-like 



