AVKNEJ5. 875 



Moxieo. Prlnijh 3050. 



4. T. filifolium Scribii. incd. 



A (leuni'ly luftiMl iKToiiniuI, about 60 cm. high. Culms few, 

 pinipio, ert'ct. Leuvcs of sterile shoots numorous, scahro'is. <,'liiu- 

 «M)ns, iiivnluto. filiform, S-l'i cm, long, 0,5 mm, broiul. Siii'iillis 

 of the culm 'I, much shorter than the iutoruodes, the u|»i)er rciicli- 

 ing to the middle of the culm; ligule 1 mm. long; blades liiilorm, 

 5-S cm. long. I'juiicle riithcr dense, contructed, liiiKrohite, 7-10 

 em. long, tho lowest rays in half-whorls of 4-S, the longest 4-5 em. 

 long, llower-bearing beyond the middle. Spikclets sul)sessile or the 

 terminal ones on short pedicels, linear, '^-IJ-tlowercd ; empty glumes 

 acute, 1-nerved, first linear-lanceolate, 3.5 mm. long, second oval- 

 luiK'colate, 3.T-4 mm. long, tho hairy joint of racliilla 1.2 mm. long; 

 floral glume ohs(!urely keeled below, lateral nerves obstiurely 2- 

 nervcd, S(;abrous, oval, 3-3.5 mm. long, truncate, ii-lobed, with a 

 very short straight awn in the notch; pulea linear before spreading, 



3 mm, long, with two scabrous keels. 



Mexico (Chihuahua), Prinylc 1431. 



(vool slopes of the Sierra Madre, at the altitude of 9000 feet. 



Var. aristatum Scribn, ined. 



Leaves of sterile shoots 30-40 cm, long; panicle thin, narrow, 

 lQ-50 cm, long, half- whorls of rays 3,5-4,5 mm, distant, the long- 

 est filiform ray 4-6 cm, long, Spikelets tijiped, pedicellate; empty 

 glumes with a bristle 0.5 mm. long; floral glume thin, keeled, oval, 



4 mm, long, obscurely 5-nerved, the apex with 1-2 bristling teeth 

 on each lol)e extending one-third the way down, awn in the notch 

 twisted and reaching three-fourths of 1 mm, beyond the apex of 

 its glume, A very marked variety at least, perhaps a si)ecies. 



Mexico. Pringle 1430, on cool slopes of the Sierra Madre, at an 

 altitude of 9000 feet, 



5, T. Hallii Scribn, Bull. Torr. Club, 11: G (1884). 



Culms smooth, slender, 15-45 cm. high. Leaf-blades flat, invo- 

 lute near the apex, those of the culm 2-7 cm. long, 1-2 mm. wide, 

 minutely scabrous. Panicle contracted. 5-10 cm, long, the erect 

 densely flowered rays 2 or more cm, long. Spikeiets 2-3-flowered, 

 racliilla nearly smooth, prolonged above the upper floret, often 



