GRASS FAMILY 81 



4 mm. long, minutely scabrous. Hills and mountain sides: Wyo. X.M. 

 Utah. Son. Mont. My-Au. 



53. P. brevipaniculata Scribn. & Williams. Stem 1-3 dm. high, smooth; 

 leaf-blades flat or conduplicate; those of the sterile shoots 1 dm. long or more; 

 those of the stem much shorter; panicle 3-6 cm. long, 1-2 cm. wide; spikelets 

 green or tinged with purple, 4-6-flowered, 4-6 mm. long; second glume 3.5 mm. 

 long; lemma obtusish or acutish, 3.5-4 mm. long. Perhaps not distinct from the 

 next species. Dry meadows and mountain sides: Colo. Utah X.M. Ariz. 

 Son. Mont. 



54. P. Fendleriana (Steud.) Vasey. Stem 3-6 dm. high; leaf-blades flat 

 or convolute, scabrous; those of the sterile shoots 1-2 dm. long, 1-2 mm. wide; 

 panicle 5-10 cm. long, open in anthesis; spikelets 7-8 mm. long; empty glumes 

 unequal, smooth, the second about 4 mm. long; lemma keeled, obtuse, 5 mm. 

 long. Hills and tablelands: Colo. X.M. Calif. Son. Subalp. My-Au. 



55. P. Eatoni S. Wats. Stem 4-6 dm. high; leaf-blades flat, scabrous on 

 both sides, those of the basal leaves 1-2 dm. long, 2-3 mm. wide, those of the 

 cauline leaves 2 cm. long or less; panicle open, 7-cS cm. long; spikelets 5-9-flow- 

 ered, obtuse 7-10 mm. long; empty glumes subequal, hispid on the keel: lemma 

 4-5 mm. long. Canons: Utah sw Colo. Ariz. Submont. Mont. Je. 



56. P. Canbyi (Scribn.) Beal. Stem 5-10 dm. high, stout, smooth; leaf- 

 blades 1-2 dm. long, 4-6 mm. wide, scabrous, flat; panicle narrow, 1-2 dm. 

 long; spikelets 6-8 mm. long, 3-5-flowered; empty glumes unequal, acute; lemma 

 about 4 mm. long, strongly scabrous, its summit scarious-margined and obtuse. 

 Meadows and bogs: Mont. Wyo. Wash. Submont. Mont. Jl-Au. 



57. P. nevadensis Vasey. Stem 5-10 dm. high, scabrous below the panicle; 

 blades of the basal leaves 1.5-3 dm. long, 2-3 mm. wide, scabrous; those of the 

 stem-leaves 3-10 cm. long: panicle narrow and dense, 1-2 dm. long; spikelets 

 6-10 mm. long. 3-S-flowered; empty glumes scabrous, 3-4 mm. long, nearly equal; 

 lemma very scabrous, 4 mm. long, obtuse, scarious-margined above. Plains, 

 meadows and hillsides: Mont. Colo. Ariz. B.C. Submont. Mont. Ap-Au. 



58. P. Helleri Rydb. Stem slender, 4-6 dm. high, often purple-tinged 

 below; leaf-blades very slender, flaccid, 5-15 cm. long, 1 mm. wide; panicle rather 

 loose, 8-10 cm. long; spikelets about 1 cm. long, 4- or 5-flowered; empty glumes 

 linear-lanceolate, 3-nerved, glabrous; lemma linear-lanceolate, about 5 mm. long, 

 scabrous on the upper part. Hillsides: Ida. 



59. P. laevigata Scribn. Stem erect, smooth, 5-10 dm. high; blades of the 

 basal leaves 1-2 dm. long, about 1 mm. wide, involute; those of the stem-leaves 

 2-5 cm. long; panicle narrow, 1-2 dm. long; spikelets appressed, 6-10 mm. long, 

 about 5-flowered; empty glumes nearly equal, acute, thin, scarious-margined; 

 lemma 4-5 mm. long, linear-oblong, the apex scarious and yellowish. P. laevis 

 Vasey. Dry meadows and hillsides: Mont. X.M. B.C. Submont. Mont. 



60. P. lucida Vasey. Stem 3-6 dm. high, smooth; blades of basal leaves 

 12-15 cm. long, 1-2 mm. wide, soft; those of the stem-leaves 5-7 cm. long; panicle 

 1-1.5 dm. long, narrow; spikelets 6-8 mm. long, 3-4-flowered, shining, pale; 

 empty glumes abruptly acute, unequal, 3-4 mm. long; lemma 2 mm. long, obtuse. 

 Dry hills: Alta S.D. X.M. Submont. Je-Jl. 



61. P. Buckleyana Xash. Stem 2-6 dm. high, rigid, smooth; leaf-blades 

 2-10 cm. long, about 2 mm. wide, flat or becoming involute in drying; panicle 

 3-10 cm. long, narrow; spikelets 2-5-flowered, 4-6 mm. long, dark green and 

 tinged with purple; empty glumes acute, nearly equal, scabrous on the keel; 

 lemma 4-5 mm. long, obtuse, scabrous above, usually more or less pubescent 

 below. P. tenuifolia Buckley, in part. (?) P. wyomingensis Scribn. Dry 

 plains and hills: X.D. Colo. Utah Wash. Plain Alp. Je-Au. 



62. P. Sandbergii Vasey. Stem 2-4 dm. high, very slender; ligules acute, 

 2-4 mm. long; basal leaf-blades 5-10 cm. long; those of the stem-leaves 1-2 cm. 

 long; panicle 3-7 cm. long, very narrow; spikelets 2-4-flowered, about 6 mm. 

 long, often purplish; empty glumes lanceolate, subacute; lemma linear-oblong, 



