148 PANIC" ACE. 15. 



slightly (.'iliate, mostly shorter tluiu the internodes: blades reticu- 

 late-veined, elliptieal-laiiceolate, acuminate, i-S cm. long, 8-14 

 mm. wide, sparingly ciliate. Spikes 5-8, on 7-10 centimeters of 

 the axis, tiio longest 15-5 cm. long. Spikelets in clusters of 2-5 

 on the primary branches, ellii)tical. 15 mm. long, first glume '.i- 

 nerved, 2 mm. long, with an awn 3-5 mm. long, second a little 

 longer, 5-nerved, unawned, third still longer, 7-9-uerved, uuawued; 

 fertile fioret 3.5 mm. long. 



Mexico (Oaxaca), Priiif/Ie 494-i. 



Texas, Mexico to Brazil. 



Anotlier form or variety is No. 4G3, Dr. E. Palmer, Jalisco, 

 Mexico, in 188(i. In tlie latter the rachis is clothed with hairs ex- 

 tending beyond and covering the spikelets. Spikelets 13-20 in an 

 oblong spike 1 cm. long, oval 3 mm. long, awns very slender and 

 rough, third glume awnless. 



21). (11) Chjetium Nees. Agrost. liras. SCO (1829). 



Herchtohlia Presl, l^>li(|. Ihvnk. ;J23, /. 43 (1830). 



Spikelets narrow in a close panicle, the pedicel articulate near 

 tlic middle, 1-tlowered with 3 empty glumes (the third standing for 

 a second tloret), first aiul second empty glumes termiiuiting in 

 l)ristle-like awns, second usually larger witli a longer awn, third 

 sliorter witli a shorter awn; fertile fioret firm, shorter, acuminate. 

 Stamens 3. Styles disiinct. (irain ol)long, enclosed, but not 

 adiiereiit. 



Kather stout grasses with narrow leaf-blades Panicle terminal 

 and ([('ii^i.' with slender rays. 



There are two species known, one belonging to Mexico, the other 

 to Brazil. 



('lupfium has nearly the spikelets of Oplismonus, the outer 

 glumes being well developed aiul awned; the infioresceuce is 

 (|uite different. Kunth places it with OpJistnenua, Doel with 

 Pdiiirtfiii. Fournier retains Chwtium for one of two species and 

 places the other in the genus Berrhtohliit. 



1. C. bromoides (Lam.) Benth. Journ. Linn. Soc. 19: 46 (1881). 

 Paniann hromoiden Lam. 111. 170 (1791). 



Culms hard, smooth, compressed, about GO cm. high, from pe- 



