70 PANICACE.E. 



short ; blades 1-5 cm. long, involute, bristling at the throat. 

 Spikes dense, 5 cm. long, 5-12 mm. wide. Empty glumes of the 

 lateral spikelets 4-5 mm. long, cuneate, obovate; the outer slightly 

 longer, with a short hairy awn on one edge below the middle ; 6-9 

 diverging nerves disappearing below the rounded, scarious apex ; 

 the inner with 4 diverging nerves, one excurrent. as a short awn ; 

 floral glume and palea a little shorter, the outer 3-nerved, with 

 the apex obcordate ; palea emarginate. Empty glumes of the ter- 

 minal spikelet narrow, keeled, equal, bearing 5-6 bristles ; floral 

 glume and palea of equal length, the former 3-nerved, bifid, 

 mucronate. 



Texas, lieverclwn 1367 ; Arizona, Pringle in 1884. 



4. H. Jamesii (Torr.) Benth. 1. c. PleurapMs Jamesii Torr. 

 Ann. Lye. N. Y. 1 : 148, t. 10 (1824). 



Culms 25-40 cm. high, slender, branching at base, the nodes 

 pubescent. Ligule oval, laciniate ; blades 1-15 cm. long, appear- 

 ing glaucous, owing to the numerous very small, stiff prickles, con- 

 volute, scabrous, hairy at the throat. Spikes 5-8 cm. long, often 

 tinged with purple. Lower emjity glume of the lateral sj^ikelets 

 6-7 mm. long, awned above the middle, outer side 2-nerved ; uj^per 

 empty glume emarginate, cuspidate, 3-nerved on tlie outer side, 

 two-nerved on the inner side; floral glume and palea about equal 

 to the empty glumes. Empty glumes of the perfect spikelet 

 keeled, ciliate, cleft nearly to the middle, lateral nerves obscure, 

 3-7 bristles on the back ; floral glume and palea exceeding the 

 empty glumes, the former 3-nerved, unequally biSd, cuspidate, the 

 palea a little shorter, bifid. 



Colorado, Jones 792 ; New Mexico, Vasey for U. S. Dept. 

 Agricul. 



Indian Territory. Arizona and southward. 



17. (61). -ffiGOPOGON lieauv. Agrost. 122 (1812) in part. 



jEgopogon H. & B., Willd. Spec. PI. 4 : 899 (1815). Hy- 

 mennthecAum Lag. Gen. et Sp. Nov. 4 (1816). Schellingia Steud. 

 Flora 33 : 231 (1850). Goat's-beakd Grass. 



Spikelets 1-flowered, in clusters of 2-6, the clusters almost 

 sessile on the peduncle or continuous rachis of the simple secondary 



