S2() POACE.T?. 



Ciilins erect, scubrid. *iO-70 cm. lii;j:li. Slieatlis over liaU' as 

 lon;.^ as the iiiternotles: ligule a ciliato riii^jj; blades scabrid. those ol" 

 tlie culm very short or rudimentary, those below tapering into a 

 long petiole, iinn, involute, IJO-f)!) em. long, ."i-T" mm. wide. I'ani- 

 ele exserted, simple, narrow, (5-10 cm. long. Spikeli'ts elliittical. 

 uciite, ubout 7 mm. long, empty glumes suberpial, reticulate-veined, 

 7-nerved; floret whitish, with a lew appressed hairs and at the base 

 a conspicuous tuft of dense hairs 1 mm. long, the awn ubout 1 cm, 

 long. Lodicules ahnost as long as the paleu. The lirm leaves 

 lusting through winter. 



Vermont, U. S. Depf. J(jn'niL "iDl fi'om Ifosford, Hdrk from 

 Congden; Ontario, Fowler; Michigan, Cooki/, Wuod, Far well, 

 Clarh r04. Heal 43, 



Northern States to Colorado. 



3. 0, Pringlei Scribn. n. sp. ined. 



Culms erect, nearly smooth, 40-00 cm. high. Leaves of sterile 

 shoots scubrid, 25-30 cm. long, the blades 2-3 mm. wide, involute, 

 pungent-pointed, those of the culm 3 in number, some of the 

 sheaths shorter than the iuternodes; ligule 5 mm. long; the upper 

 blade 1-5 cm. long. Panicle thin, spikelike, 12-l(!cm. long, rays 

 in twos and threes, the longest 4 cm. long, beuring four spikelets oji 

 the outer half. Spikelets purple or l)rown. elliptical, 5-.'). 2 mm. 

 long, empty glumes subequal, broad near the apex, first 5-nerved, 

 second 7-nervcd; floret brown, clothed with short ap2)ressed hairs, 

 awn 12-24 cm. long. Lodicules one-third the length of the pulea. 



Crowing at an altitude of 10.000 feet. 



Mexico (Oaxuca), Prinyle 4750. 



Professor Scribner identifies this grass as Oriizopsifi, near Stipa 

 mucronata, and at my request consents to give it a specific name. 



4. 0. Sibirica (Lam.). Stipa Sibirica Lam. 111. 1 • loS (1701). 

 Stipa Bloomeri Boland. Proc. Calif. Acad. 4:1G8 (1873). 0. ca- 

 daca Beal, Coult. liot. Guz. 15: 111 (1800). Stipa cadaca Scribn., 

 Vasey Contrib. U, S. Nat. Herb. 3:54 (1802). 



Culms erect, rather stout, about GO cm. high. Sheaths shorter 

 than the internodes, ciliate on tlie margins; ligule 3-4 mm. long; 

 blades of the culm 3, smooth, involute with long slender points, 



