Xo. 65, L. Stejueger, Knrilc Islands, August 22, 1896. Fertile plants of this spe- 

 cies are represented in the National Herbarinm l>y Nos. 1185, 1200, and a part of 

 No. 1206, L. M. Turner, collected on Atka Island, Alaska, in July, 1880, reported 

 to be common. 



This species is very closely related to P. hisjudida Yasey, but may be distin- 

 guished bj' its more open and lax panicle, its larger spikelets, which are usually 

 4- to 5-flowered, and by its longer, narrower, and more acute glumes, both the 

 outer ones being 3-nerved and nearly or quite as long as the nearest llorai glumes. 

 Poa leibergii Scribn. sp. nov. (Plate II). A densely ciespitose, librous-rooted, gla- 

 brous perennial, with crowded basal leaves 1 to 5 cm. long, slender, scape-like 

 culms .5 to 1.5 dm. high, and few-flowered, simple panicles; base of the culms 

 densely clothed with loose scarious sheaths. Innovations iutravaginal. Culm 

 leaf one, hardly appearing above the leaves of the innovations; ligule very del- 

 icate, hyaline, about 2 mm. long; leaf blade about 1 mm. wide, 2 to 4 cm. long, 

 that of the culm 1 to 2 cm. long, conduplicate when dry, minutelj' scabrous along 

 the margins and at the ai)ex, otherwise smooth. Panicles Ijearing 3 to 7 spike- 

 lets, or sometimes reduced to a single spikelet. Lower branches nsuallj' in 

 pairs, minutely scabrous, each branch bearing a single sjiikelet. Spikelets 2- to 

 3-llowered, 5 to 6 mm. long, rather broadly ovate; outer glumes somewhat 

 unequal, the hrst broadly lanceolate, 1-nerved and subacute, the second much 

 broader than the first, 3-uerved, and varying from subacute to broadly truncate 

 at the erose-dentate apex; flowering glumes glabrous, the first 4 to 5 mm. long, 

 somewhat exceeding the outer glumes, distinctly 5-nerved, obtuse and erose- 

 dentate at the scarious ajicx; jialea a little shorter than the glume, ciliate- 

 scabrous on the keels excepting near the base. 



Collected on the summits of the ridges which form the northwestern angle of 

 the barren valley, Malheur County, Oregon — the Owyhee-Malheur Divide, alti- 

 tude 1,250 m., No. 2171, John B. Leiberg, May 31, 1896. 



Regarding this grass Mr. Leiberg says: "It grows in medium-sized, extremely 

 tufted, and densely matted patches, occurring rather sparingly in open, turfy 

 places in the Juniper timber, especially upon depressed areas which hold water 

 during a few weeks in early summer." 



This species is at once distinguished from Poa pattersoni by its fewer-flowered 

 panicles and glabrous flowering glumes. The alpine Poa letiermani Yasey has 

 a habit of growth somewhat similar, and glabrous flowering glumes, but the 

 spikelets are hardly more than half as large, and the outer glumes exceed the 

 flowering glumes in length. It does not possess the long, scape-like culm of the 

 species here described. Poa prbiglei is a more rigid grass, with short, creeping 

 rootstocks, shorter culm leaves, and larger spikelets, the flowering glumes being 

 much firmer in texture and distinctly scabrous, especially near the apex. 

 Panicum leibergii Scribn. (Plate III). {Panicum acoparium Jeihergii Yasey, Contr. 

 U. S. Natl. Herb., A'ol. 3, 31.) {Panicum scribiieriantim hibergii Scribn. Bull. 6, Div. 

 Agros. 32; 1897.) — A slender, erect or ascending perennial 3 to 6 dm. high, with 

 rather broad, Hat leaves, and few-flowered panicles of comparatively large, obtuse 

 spikelets. Culms strongly scabrous, esj)ecially iu>ar the nodes, oltcu geniculate 

 at the base, finally much branched, branches erect; sheaths rather loose, striate, 

 papillate-pilose to hirsute, with rather long spreading hairs, the papillie lying 

 between the stria-, ciliate on the margins near the tliroat; ligule a \ cry narrow 

 and minutely ciliate ring, almost obsolete; leaf blades oi the primary ciiluis about 

 10 cm. long and 1.5 cm. wide (those of the branches somewhat smaller and nar- 

 rower), with 9 to 11 nerves, lanceolate-acute, clasping at the rounded or subcor- 

 date base, conspicuously i)apillate-i)ilose on the lo\\ cr surface, sjiariugly so above, 

 rough scabrous on the upper surface and along the very narrow, cartilaginous 

 margins, which are also more or less conspicuously ciliate. Panicle ovate-oblong, 

 5 to 7 cm. long, sparingly branched, tlio scabrous branches more or less spreading, 

 bearing 1 to 3 spikelets. Sinkelets oblong, obtuse, 3 to 4 mm. long; the outer 



