'MO I'OACK.K. 



^■lunies ')-6 iimi. l<»iig, lloml j^luiin' 7 nun. lonpr with u mucro; 

 [Kilfu .'>.5-(') iiiiii. l*)ii<;. Like ilio latter plaut in tliu lieiliariiiiii of 

 lliirvunl lire oIIrts from Holivia. No. 1, Dr. K. I'lilinor, Cliiiiiiu- 

 liuii, Mexico (liSSf)), id imnn'il A', iinnronni Meiith. 'I'liia weenis to 

 lt(! near No. (>1!> of I'arry iS: I'almer: in tliis the spike is doiisf, 

 (» tnm. witle; empty j,'lume8 a little h)iif;iT than in 919, ineliulin;; 

 a bristle point, apparently not more than a variety. 



(i. E. Bourgeei Kourn. llemsl. itidi. Centr. Am. Hot. .'J:. 548 

 (liSSO). Sjun'ohdhis ruiujihiHohis Scribn. ined. 



A rather stout ereet perennial, ISO cm. hi<,'h. Culms smooth, 

 compressed below. Sheaths smootii. keeled, lonj^er than the inter- 

 nodes; li;,'ulc hyaline, 10 mm. lon^', acute or laciTate; blades Hat, 

 (JO mm. loiifj, ;$-(• mm. wide, iittenuate-pointed, scabrous on both 

 sides. I'anicle dilTuse. 45 cm. lon«j;; rays irre«,ndarly .scattered on the 

 rachis, capillary, l)earin<,' spikelets on the outer half, the lower 10- 

 15 cm. long. Spikelets nearly terete, l-llowered. 1.5-;.' mm. lonjj; 

 empty glumes ovate to oblong, obtuse, sube(|ual, 1-nerved, equalling 

 the lloret or a little shorter; lloral glume broadly obtuse, occa- 

 sionally mucroiuite; palea as long as its glume. Grain nearly as 

 long as the lloral glume. Distributed as Sjuirobolus coinphtnalKs 

 Scribn. n. sp. 



Mexico, Priitf/h' '.iXio. 



Under cool eliU's, near Guadalajara, State of Jalisco. 



Scribner says: "This grass diil'ers from yi);<VY///7^<'.s' as described 

 by Bentbam & Hooker in the widely ditl'use i>anicle 'IMie irregu- 

 lar disposition of the branches, the firm texture of the floral glume, 

 large palca and terminal awn or mucro, separate it from AyrostiK. 

 The adherent pericarp alone separates it from Sporobuhii^. l-'rom 

 Mi(hh'iiberyi(i it is distinguished by its loosely enclosed caryopsis." 



7. E. rigens Henth. Journ. Linn. Soc. 19:88 (1881). Citnia 

 macrotim Thurb. not Kunth, S. Wats. Hot. Calif. 2:270 (1880). 



Perennial; cuIjhs rigid, erect, smooth, 00-120 cm. high. Sheaths 

 longer than the internodes, loose, smootli or glabrous; ligule 4-G 

 mm. long; blades scabrous, rigid, narrow, strongly involute, a])ex 

 attenuate, 10-30 cm. long. Panicle exserted or with the base in- 

 cluded, erect, dense, spikelike, interrupted below, 20-50 cm. long, 



