AVKNK.R 305 



sitnplo, ovoid or irroj^'uliirly oI)1om^, '^-3-10 nun. lon^'. Spiki'lcts 3- 

 ll(»\vort'tl, l)r()\vii above, ruil or piirplo below; etuply j,'liimi's Hourly 

 ('<|iiiil, iibout '^.5 mm. lon>,', first l-nervL'd, sucoiitl iJ-iicrvud, tlio 

 luleral nervL'S oitscuru; llorets l*.') mm. loii<^, overlappiii;,' lor Tuur- 

 lirilis of their length, very spariiiuly i^lotlied at thu base with short 

 weak hairs, raehilla aiiioolli. rinliiiu-iit al)ove the see()ii(l llower 

 twice us h)iig us tho joint of racliilla lietweeii tlie llorets, boai'lng a 

 small gliimu or rarely u third tloret; lloral gliuiio Ijroudly oval, 

 truncate, irregularly toothed, thinner than the empty glume, deli- 

 cately 5-uerved; u straight awn a littlo bulow the middle, scarcely 

 reaching to the t\[t of its glume; palea broad, not keeled, a litllo 

 shorter than its glume, irregularly -l-tootlied ; the two obscure nerves 

 diviTiiing. I'eriiaps this should bo included in /K (■(is/ii/osir Heaiiv. 



(Jrinnell Land, /.iriif. llreelij in 188:^; (Jolorado, I'un'i) IJUT; 

 Alaska, llitrriiKjIoH, /hill. 



'^. D. Pringlei Scribn. Proc. Acud. Phila. :}00 (1S91). 



Culms erect, i)auiclc simple, GO-'JO cm. high. Sheaths scabrid, 

 smooth, shorter thau the iutornodes, oblique ut the throat; ligule 

 truu(;ato, friugcd, decurrent, about 'i mm. long; blades scabrous, 

 involute, rigid, 10-15 cm. long, 2— i mm. wide. Panicle dense, 

 sitikelike, somewhat interrupted below, 7-17 cm. long, the lowest 

 rays branching, spikelike, uppressed, 2-5 cm. long. Spikelets linear- 

 lanceolate; empty glumes equal, 4.3-5.3 mm. long, 1-nerved, keel 

 scabrous, joint of rachilla between florets about 0.3 mm. long; 

 floral glume linear, about 3-4 mm. long, with 2 blunt lobes, awn 

 one-third the way i'rom the base and projecting above its glume 3-4 

 mm. ; ])alea thin, 2-keeled, 2-toothed, a little shorter than its glume. 

 Anthers linear, 1.2 mm. long. 



This has much tho aspect of Trisefum. 



Mexico, PrlnfjJe 1429. 



3. D. flexuosa (L.) Trin. Bidl. Sci. Acad. St. Petersb. \'.m 

 (183()). Aim Jlexuosa L. Sp. PI. 05 (1753). There are nuniy 

 other synonyms. 



A tufted perennial, 40-00 cm. high, culms nearly naked. Lig- 

 ule short; blades very narrow, those at tho base 3-12 cm. long, 

 those of the culm 2-5 cm. long. Panicle spreading, 8-12 cm. long. 



