ANDROPOGONE^. 57 



lets mostly terminal in pairs or fonrs. panicled, with few or many 

 brandies. 6-12 em. long, the wliite hairs longer than the spikelets 

 and partially concealing them. On tlie sessile spikelets first glume 

 ovate-lanceolate, with a vertical groove on the back, 8-nerved, 

 margins involute, keeled, 4 mm. long; second ovate, acute, mem- 

 branous, keeled, 3-nerved; the bent awn of the fourth 15-25 mm. 

 long. Stamen 1. Pedicels as long as the spikelets; first glume lance- 

 elliptical, 11-nerved, margins involute, keeled; second smaller. 



Texas, U. S. Dept. Agricul. 199 from Keverchon and Nealley; 

 Arizona, Pringle. 



Texas to Arizona. 



Var. barbinodis (Lag.) Hack. D. C. Monog. Phan. 6 : (1889). 

 A. barbinodis Lag. Gen. et Sp. 1:3 (1816). A. argenteus D. C. 

 Cat. Hort. Monsp. 77 (1813). Saccliarum argenteum Brous. El. 50. 

 Eriantlms sacchm-oides Willd. Enum. 46 (1809). 



Sheaths densely bearded at the nodes; ligule 3-4 mm. long; 

 blade green or subglaucous, smooth or sparingly pilose below, 20-40 

 cm. long, 4-7 mm. wide; panicle 10-15 cm. long, showy. 



Mexico, Pcdmer 1347. 



Yar. genuinus Hack. D. C. Monog. Phan. 6: (1889). 



Glaucous, slender, hairs on the nodes few and short. Pedicel- 

 late spikelets 2.5 mm. long, of 2 glumes. Sessile spikelets 3-5 mm. 

 long; first glume flattened, 3 mm. long, 9-nerved; second 3 mm. 

 long, awn slender, 9-18 mm. long. 



Mexico, Pringle 316. 



Var. submuticus Hack. 1. c, var. inermis Vasey ined. Nodes 

 smooth, spikes 1.5-3 cm. long, in about 10 clusters of 4-10 each, 

 all racemose on a rachis about 10 cm. long; first glume of pedicellate 

 spikelet 5-nerved, fertile floret 3 mm. long. 



Texas, Kealley in herb. Scribner. 



Var. glaucus (Torr.) Scribn. A. glaucus Torr. Ann. Lye. N. Y. 

 1:157 (1824). A. saccharoides. var. Torreanus Hack. D. C. 

 Monog. Phan. 6 : 495 (1889). A. Torreanus Steud. Nomencl. 

 Ed. 2. 93 (1841). 



East Texas, Hall 845, Curtiss 3633, Wright 2102, Drummond 

 313. 



