226 POACEiE. 



Culms erect, scabrid, 20-70 cm. high. Sheaths over half as 

 long as the internodes; lignle a ciliate ring; blades scabrid, those of 

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

 long petiole, firm, involute, 30-50 cm. long, 5-7 mm. wide. Pani- 

 cle exserted, simple, narrow, 6-10 cm. long. Spikelets elliptical, 

 a,cute, about 7 mm. long, empty glumes subequal, reticulate- veined, 

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

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

 long. Lodicules almost as long as the palea. The firm leaves 

 lasting through winter. 



Vermont, U. S. Depi. Agricul. 291 from Hosford, Clarh from 

 Congden; Ontario, Fowler; Michigan, Cooleij, Wood, Farwell, 

 Clarh 704, Beal 43. 



Northern States to Colorado. 



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



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

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

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

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

 blade 1-5 cm. long. Panicle thin, spikelike, 12-16 cm. long, rays 

 in twos and threes, the longest 4 cm. long, bearing four spikelets on 

 the outer half. Spikelets purple or brown, elliptical, 5-5.2 mm. 

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

 second 7-nerved; floret brown, clotlied with short appressed liairs, 

 awn 12-24 cm. long. Lodicules one-third the lengtli of the j)alea. 



Growing at an altitude of 10,000 feet. 



Mexico (Oaxaca), Pr ingle 4759. 



Professor Scribner identifies this grass as Oryzopsis, near Stipa 

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



4. 0. Sibirica (Lam.). Stipa Sihirica Lam. 111. 1 : 158 (1791). 

 Stipa Blooineri Boland. Proc. Calif. Acad. 4:168 (1873). 0. ca- 

 duca Beal, Coult. F>ot. Gaz. 15: 111 (1890). Stipa raduca Scribn., 

 Vasey Contrib. U. S. Nat. Herb. 3:54 (1892). 



Culms erect, rather stout, about 60 cm. high. Sheatlis shorter 

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

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



