36 



PANICACE.E, 



long. Spikes 1-6, terminal, protnuling above the leaves, 8-17 



cm. long. Sessile stamiuato spikelet 

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

 long obtuse, flat concave, ^-keeled. !i- 

 ll-nerved, 7 mm. long, second glume 

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

 third oblong, 2-nerved, 5 mm. long. 

 fourth narrower and shorter, :}-nerved. 

 Pedicellate spikelets 2-'.] mm. long 

 with a hard oblique point, al)ovo 

 which are appressed hairs. Flower 

 perfect, first glume sparsely hairy, 

 flat-concave, obtuse, 7-!)-nerve(l, 8 

 mm. long, second round on the back, 

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

 first, third 3-nerved, the lower portion 

 hyaline, 2 mm. long bearing a twisted 

 bent awn 2.5-13 cm. long. 

 Mexico, Palmer 303. 

 The species is found in west Texas, 

 Arizona and Mexico. 



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

 1. c. Andrcqioyan Monfiifari II.B.K. 

 Nov. Gen. et Sp. 1 : 184 (1815). T. 

 Monhifari^coi^, ^Uirt. Fl. Bras. 2 : 342 

 (1820). lilades all flat or the radical 

 ones convolute. 2-5 mm. wide; ligulo 

 2-13 mm. long. Spikes 10-17 cui. 

 long; staminate spikelets ovate-oblong, 

 G-7 mm. long, first glume more or 

 less pilose on the back. Arizona, 

 Priiif/h'\75: Mexico, Palmer MM. 

 13. (83). ElionURUS II. & li. Willd. Sp. PI. 4 : 941 (1805) 



(Elyonurus). CalUcliloea Sprong. Steud. Norn. F]d. 2, 1 : 257 



(1840). 



Spikelets in pairs in the alternate notches of the articulate 



Fig. 13. — Trnchypogon poly 

 morphiiK. Spikelets, X 4 

 (Hicliardson.) 



