44 PANICACE.E. 



lute, 7-8-nerved, second membranous, ciliate-keeled, 4-5-nerved, 

 8 mm. long, third hyaline shorter, fourth G mm. long bifid over 

 half its length bearing a bent awn 12-17 mm. long. Pedicellate 

 spikelets protruding above the hairs. Pedicels G mm. long beurmg 

 a lanceolate spikelet a little shorter than itself consisting of 2 empty 

 glumes. 



Texas, Nealley; Arizona, Pringle, Leniinoii 925. The latter is 

 owned by F. L. Scribner and marked "teste E. Hackel." 



Var. brevipedicellatus. Leaf-blades less than 2 mm. wide. 

 Pedicels 4 mm. long, first glume of the sessile spikelet 6-7 mm. 

 long. 



Mexico, Pringle 383. Distributed as A, liirtiflorus Kunth. 



Subvar. oligostachyus (Chapm.) Hack. D. C. Monog. Phan. 6 : 

 372 (1889). A. oligostachyus Chapm. Fl. S. States, 581 (1860). 



Rachis slender, 5-G cm. long with 10-15 joints. 



Arizona, Pringle. 



Var. feensis (Fourn.) Hack. D. C. Monog. Phan. 6 : 372 

 (1889). A. feensis Fourn. Mex. PI. Enum. Gram. 62 (1886). 

 Sheaths pilose, ciliate; blades scabrid; racemes 5-7 cm. long, 

 slender, 10-12-jointed, apex of the joint 1 mm. broad, loosely pilose. 



Arizona, Lemmon 2925. Mexico, Parry, Palmer 966. 



3. A. brevifolius Sw. Prodr. Fl. Ind. Occ. 26 (1797). Annual; 

 culms 10-100 cm. long, very slender with filiform flowering 

 branches in twos and threes from nearly all the nodes. Ligule 

 very short; blade contracted at the insertion, green, glabrous, with 

 margins scabrous, spathes reddish green, glabrous, clavate. Racemes 

 5-10-jointed, the joints clavate, 2-toothed, about the length of the 

 sessile spikelets. Sessile spikelet linear-oblong, pale green; first 

 glume firm, involute, 2-toothed. subconvex on the back, obscurely 

 2-3-nerv^d; second glume awnless, very acute, 1-nerved; fourth 

 glume divided almost to the base. Anthers 1-1,5 mm. long. Grain 

 linear. Pedicellate spikelets 1-1.5 mm. long, on pedicels which are 

 as long as the joints of the racemes, first glume bearing a slender 

 awn. 



Var. genuinus Hack. D. C. Monog. Plian. G : 363 (1889). 

 A. Irevifolius var. 2)}{na Franch. et Savat, Enum. PI. Jap. 2, 610 



