Spikelets compressed, ovate-lanceolate, acute, 8-4 -flowered. Empty glumes 

 ovate, obtuse or acutish, 3-nerved, scabrous on the back, subequal, about 

 4 mm. long ; flowering glumes oblong-ovate, obtuse, 5-nerved, puberulent on 

 the back, conspicuously piibescent on the lower half of the keel and marginal 

 nerves, and more or less pubescent on the intermediate nerves, scarious-mar- 

 gined above, 3-4 mm. long; palet nearly or quite equaling the flowering 

 glume, rather narrow, tapering above to a narrow truncate, more or less 

 irregularly fringed apex, the prominent green keels hispid-pubescent. Grain 

 pointed below, narrowed above, and bearing three minute, whitish tubercles 

 on the summit. 



Type specimen No. 2814, Thos. A. Williams, moist banks. Spring Creek, in the 

 Big Horn Basin, Wyoming, August 4, 1897. Altitiide, 1,500 meters. 



This species has been confiTsed with Poa lucida Vasey, from which it differs more 

 particularly in haljit of growth and in the longer, flat, glaucous leaves, stems 

 rough below the nodes, and conspicuously piibescent nerves of the flowering 

 glumes, which are glabrous between the nerves. 



Its range as indicated by specimens in the U. S. National Herbarium extends 

 from southwestern South Dakota to central Wyoming and north to central 

 Montana, 



7. POA ACUTIGLUMIS Scribner, sp. nov. 



A loosely tufted perennial about 6 dm. high, with rather short radical leaves and 

 pale green or purplish panicle about 1 dm. in length. Culm smooth or some- 

 what roughened at the nodes and just below the panicle. Cauline leaves 

 2-3, minutely roughened on both the upper and lower surfaces. Sheaths 

 smooth or somewhat roiTghened above, striate, shorter than the internodes. 

 Ligule aboiit 5 mm. long, acute, often more or less fimbriately divided, 

 rough-hispid on the back. Panicle ovate in outline, acute at both ends, 

 branches in twos or threes, rough-hispid, ascending, the lower longer ones 

 about 5 cm. in length. Spikelets lanceolate, acute, remotely 4-6-flowered, 

 8-11 mm. long; empty glumes unequal, rough-hispid on the back, the lower 

 long-acuminate, 3 nerved, the upper lanceolate, acute or aciiminate, more 

 or less distinctly 5-nerved, 5-6 mm. long; flowering glumes rather conspicu- 

 ously 5-nerved, narrowly oblong-lanceolate, acute, rough-hispid, on the 

 back, with a short, crisp pubescence at the base and on the lower half of the 

 nerves, about 5 mm. long. Palet a little shorter than the flowering glume, 

 oblong-linear, acute, conspicuously ciliate on the keels and sparsely pubes- 

 cent near the base between them. 



Type specimen collected by Thos. Howell at Grave Creek, Oregon, May 21, 1884. 

 A very distinct species, apparently without any very near relatives. 



8. POA TENERRIMA Scribn., sp. nov. 



A very slender, csespitose perennial, 3-5 dm. high with short, filiform leaves and 

 spreading capillary panicles, 7-9 cm. long. Leaves of the intravaginal inno- 

 vations 4-8 cm. long, thread-like ; those of the culm 3-5 cm. long, the upper- 

 most usually about 4 mm., involute, filiform, at least when dry, smooth. 

 Panicle branches in twos and threes, or solitary above, minutely scabrous, 

 flower-bearing only near the tips ; spikelets 3-4-flowered, aboiit 7 mm. long, 

 florets rather remote on a slender rachilla ; empty glumes lanceolate, acute, 

 the first about 2.5 mm. long, the second a little longer and broader than the 

 first. Flowering glumes about 4 mm. long, oblong, obtuse, 5-nerved, per- 

 fectly smooth excepting for a short, crisp pubescence near the base. Palet 

 nearly as long as the glume, 2-keeled, 2-tootlied at the apex, keels ciliate, 

 excepting near the base. 



