A(il?(»STll)K.E. 199 



A slciidci' siiinotli iHTcmiiiil. ;>()-.'>() nil. lii<;li; ciilins unltraiirlu'd. 

 Sliciitlis sliortcr tliaii tliu iiitfi'iiodt's; li^'uli' si ciliutL' riiij;; bliides 

 of sterile shoots iiivuiuti', lilit'(»riii. orteii llexiiose. I'-'M) cmii. lonj;. 

 tliose of the culm about 3 cm. lou^^ I'auide erect, sjiikelike. 

 narrow, 10-1.5 cm. loii<jr. ravs erect aiul nearly sessile, closely ap- 

 [U'es.sed. Empty <;liinu's purplish, lirst (1-i mm. loiij,', second 

 lO-I".' mm. loii^'; lloral ;rlume 10-11 mm. lon<,'; awns sii^ditiy 

 united and twisted at the base, sjireading, nearly equal, "^5-3"^ nnu. 

 long. 



Vascy states that this grass *' DilTers from .1. purpurea \utt., 

 in the narrower, denser i)anicle, with sessile branches, smaller 

 flowers and .shorter awns." 



Texas, Hcrerc/wu l'i't7. 



S. A. barbata Fourn. .Mex. PI. Enum. Gram. 7H (188G). J 

 itciiru Va.sey, ined. 



A rather stout i»erennial, G0-90cm. high ; culm simple, smooth 

 or jinbescent. Sheaths longer than the internodes, smooth, filiate 

 with short hairs; ligule very short; blades involute. 30 cm. long, 

 the lower setaceous, those on the culms "^-3 mm. wide. Panicle 

 narrow; lower rays 3-5 cm. below the next above. Empty glumes 

 narrow, involute, 1-nerved, first 8-10 mm. long, second as long 

 or a little longer and bifid with a short awn; floret G-10 mm. long 

 to a twisted beak 4 mm. long; lateral awns 8-15 mm. long, the 

 central one 3-5 mm. longer. 



Mexico, Puhiicr 5"-20. J'n'/if/Ie 1889, ticketed .1. lanu<iiuos(i 

 Scrib. n. sp. 



9. A. Nealleyi Vasey, Contrib. U. S. Xat. Herb. 3:45 (18!»-2). 

 A. xlrirla var. Xcallej/i Vasey, Contrib. U. S. Herb. 1:55 

 (1890). 



A slender strict light-colored i)erennial,, 40-00 cm. high. 

 Culms with about three nodes. Sheaths half as long as the inter- 

 nodes; ligule a mere ring, sometimes ciliate; blades smooth, invo- 

 lute-setaceous, pungent-pointed, 10-30 cm. long. Panicle spike- 

 like, very slender, interrupted, 10-30 cm. long; rays in twos, the 

 longest about 3 cm. long, bearing three spikelets. Empty glumes 

 mucronate, lirst about 5 mm. long, second 8 mm. long; floret 



