198 POACEzE. 



Florida, Gurtiss 3427, Olarh 5050. 



Low pine-barrens. South Carolina to Florida. 



5. A. appressa Vasey, Contrib. U. S. Nat. Herb. 1: 283 (1893). 



Culms slender, 60-120 cm. high. Lower leaves not seen, the up- 

 per narrowly setaceous, 10-15 cm. long. Panicle narrow, 20-30 cm. 

 long, naked below. Empty glumes setaceous, subequal, about 10 

 mm. long; floral glume 30 mm. long, purple, beak somewhat 

 twisted; awns nearly equal, 10-12 mm. long. 



Mexico, Palmer in 1885. 



The long stiff culms are tied together by the natives for brooms. 



Var. brevior Vasey 1. c. 



Culms tufted, 60-90 cm. high. Leaves of culm 3-4; sheaths 

 glabrous; ligule obsolete; blades flat or involute, 15-25 cm. long. 

 Panicle 17-24 cm. long; rays appressed. Spikelets nearly as in the 

 j)receding, but the floral glume a little longer than the empty ones ; 

 awns a little longer. 



Mexico (Rio Blanco), Palmer 516. 



6. A. Arizonica Vasey, Bull. Torr. Club, 13:27 (1886). 



An erect smooth unbranched grass, 30-60 cm. high. Ligule 

 short; leaf-blades of the culm usually four, becoming involute, 10- 

 20 cm. long. Panicle much exserted, narrow, simple, 10-25 cm. 

 long, the lower internodes 5-7 cm. long; rays in twos below, the 

 longest 8-10 cm. long, bearing a few spikelets along the upper half. 

 Empty glumes nearly equal, hispid on the keels, toothed, 14-15 

 mm. long, besides the very short awns, first 1-nerved, second 1-3- 

 nerved; floral glume including the hairy-beaked callus and the 

 twisted apex to the base of the separate awns about 15 mm. long; 

 aAvns divergent, the lateral ones 2 cm. long, the central a little 

 longer. 



Dr. Vasey says: " This species differs from A. purpurea 'Nutt., 

 in a more rigid habit, longer leaves, more erect and rigid panicle, 

 and especially in the comparative length of the glumes, in tlie larger 

 flowering glume, and in the shorter awns." 



New Mexico, Vasey; Texas, Nealley. 



Texas to California. 



7. A. Reverchoni Vasey, Bull. Torr. Club, 13: 52 (1886). 



