36 



PANICACE^. 



long. Spikes 1-5, terminal, protruding above the leaves, 8-17 



cm. long. Sessile staminate spikelet 

 5-8 mm. long, without a callus, ob- 

 long obtuse, flat concave, 2-keeled, 9- 

 11-nerved, 7 mm. long, second glume 

 linear, 3-nerved, as long as the first, 

 third oblong, 3-nerved, 5 mm. long, 

 fourth narrower and shorter, 3-nerved. 

 Pedicellate spikelets 2-3 mm. long 

 with a hard oblique point, above 

 which are aj)pressed hairs. Flower 

 perfect, first glume sparsely hairy, 

 flat-concave, obtuse, 7-9-nerved, 8 

 mm. long, second round on the back, 

 oblong, 3-nerved, bifid, as long as the 

 first, third 3-nerved, the lower i:)ortion 

 hyaline, 2 mm. long l^earing a twisted 

 bent awn 2.5-12 cm. long. 

 Mexico, Palmer 303. 

 The species is found in west Texas, 

 Arizona and Mexico. 



Var. Montufari (H.B.K.) Hack. 

 1. c. Andropogon MonUifari H.B.K. 

 Nov. Gen. et Sp. 1 : 184 (1815). T. ' 

 Montufari Nees, Mart. Fl. Bras. 2 : 342 

 (1829). Blades all flat or the radical 

 ones convolute, 2-5 mm. wide; ligule 

 2-13 mm. long. Spikes 10-17 cm, 

 long ; staminate spikelets ovate-oblong, 

 6-7 mm. long, first glume more or 



Fig. n.-Trachypogon poly- ^ -^ ^^ ^.^^j.^ Arizona, 



morpJiux. fepikelets, X 4. ^ ' 



(Richardson.) Fringle 175; Mexico, Palmer 4:Q7. 



13. (83). Eliontjrus H. & B. AVilld. Sp. PL 4 : 941 (1805) 



(Elyonurus). Callichlma Sprang. Steud. Norn. Ed. 2, 1 : 257 

 (1840). 



Spikelets in pairs in the alternate notches of the articulate 



