GRASS FAMILY 81 



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

 Utah. Son. — Moni, "^My-Au. 



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

 leaf-blades flat or condupUcate; 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-flowored, 4-G nun. long; second glume 3.5 mm, 

 long; lemma obtusiish or acutish. 3.5-4 mm. long. Perhaps not distmct from the 

 next species. Dry meadows and mountain sides: Colu. — Utah — N.M. — Ariz. 



Son, — Mont. 



64. 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.— N.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, 7-8 cm. long; spikelets 5-9-flow- 

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

 4r-5 mm. long. Canons: Utah— sw Colo.— Ariz. Snbmonf.—^foni. 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. Suhmont.—Mont. Jl-Au. 



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

 blades of the basal leaves L5-3 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. 3-8-flowered; empty glumes scabrous, 3-4 mm. long, nearly equal; 

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

 meadow-3 and hillsides: Mont.— Colo.— Ariz.— B.C. SubmonL—MonL Ap-Au. 



58. P. Helleri Rvdb. 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. w^de, involute; those of the stem-leaves 

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

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

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

 Vasey. Dry meadows and hillsides: Mont.— N.M.— B.C. Suhmont.—Moni. 



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 

 1-15 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.— N.M. Subrnont. Je-Jl, 



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

 2-10 cm "long about 2 mm. \s-ide, flat or becoming involute in drying; panicle 

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

 tineed with purple; emptv glumes acute, nearly equal, scabrous on the keel; 

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

 below P lemdfolia Buckley, in part. (?) P. tryommgensis Scribn. Dry 

 plains* and hills: N.D.— Colo.— Utah— Wash. Plain— Alp. J(-Au. 



62 P Sandbergii Vasey. Stem 2-4 dm. high, very slender; hgules 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 Imear-oblong, 



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