470 IMtACK.K. 



wide, tlioso of tlio cuhn :{-4, aiul shorter; li;,'ule u ciliutc rinjr. 

 I'lmiclc slijjhtly t'xsertt'd, (louse, sli^'lilly ititeniiptt'd, '.(-14 cm. 

 loiij;, 7-14 diiim. SjdkoU'ts judo or tin;,a'd with purpU', uhloiig or 

 ovate. T-lO-llowerud, 4.5-5.5 iiiiii. loMi,'; (Miipty j;li:nies broad, 

 oviite, ueute, 1-iierved, lirst '.*.5-4 mm. loii^', second a little louijer; 

 llorul glume nearly smootli, broad oval, mostly miicroiiate, :}-:). '» 

 mm. lor.g; luilea ovate, obciiiieate before si)readiiig, 'Z.^-'i mm. 

 Ioii;»', mar;,Mns broad and infolded. 



Texas, Hcverrluni, Ai'<i/lei/ for V. S. Dept. Af];rieul., Je/ini/. 



1:5. S. acuminata (.Mnnro) Kuntze 1. e. TricK/^pis acunnmita 

 Mnnro, A. (Jruy, I'roe. Acad. Sc. Phila. :);)5 (ISO;?). TrUnlia acii- 

 iiniiotd Hentli. Vasoy. (Ir. l'. S. ;55 (1SS>*)). 



A slender erect tufted glaucous grass, 15-20 cm. high, nodes 

 smooth. Leaves of sterile shoots numerous, curved, couduplicate. 

 ;{-8 cm. long, 1.5-'^ nun. wide, apex obtuse, not recurved, those of 

 the culm "l\ ligule a ciliate ring, all blades with light-colored mid- 

 nerves and a similar one on each margin, the width very uniform 

 throughout. Panicle much exserted. very simple, dense, oblong, 

 1.5-2.5 cm. loug. Spikelets whitish or jjurplish, ovate-lanceolate, 

 S-l(»-llowered. !)-! 1 nun. long; empty ghunes suberpial. linear- 

 lanceolate, 4.5-5 mm. long; floral ghuue with keel pubescent neiir 

 the base and lateral nerves throughout. ovate-Iaiu-eohite. acute or 2- 

 tootlied. 5 mm. long, tlie awn 0.5-1.5 mm. long; palea oval or 

 spatulate, ciliate on the keels, 3.5-4 mm. long. 



Texas, hWeir/ion for V. S. Dept. .\gricul. 534. IMI 779, 

 Liiidlieinier 738; Arizona (llackbcrry), Jones, Pritujle in 18S4; 

 Mexico, Pri>ii/h> 4O0. 



Very nearly allied to S. avcmicea (II. li. K.), aiul }>erliaps one 

 should be considered a variety of the otlu'r. 



14. S. Nealleyi (Vasey) L. II. Dewey, ("oult. C'ontrib. U. S. 

 Nat. Herb. 2:538 (18!)4). Triodia Xenn<'i/i V-mv\, Bull. Torr. 

 Club, 15:49 (1888). 



A slender erect tufted glaucous perennial, 30-40 cm. high, nodes 

 villous. Leaves of sterile shoots numerous, recurved, conduplicate, 

 5-8 cm. long, 2.5 cm. wide, apex obtuse, recurved, those of the 

 culm 3; ligule a brown ciliate callous ring; all leaves with aeon- 



