17 



Idaho: B. W. Everman, Xo. 319, shores of Petit Lake, August 13, 1895, 



Oregon: A fragmeutary speciiuen collected by the U. S. South Pacific Exploring 



Expedition, under the command of Captain Wilkes, 1838-1842, is doubtfully 



referred here. 



15. SITANION STRIGOSUM J. G. Smith, sp. nov. 



Culms stout, erect, 3 to 6 dm. high, terete, striate, glabrous, the uppermost inter- 

 nodes minutely pubescent. Xodea brownish, glabrous. Sheaths open at the 

 throat, loose, striate, scarious along the margins above, more or less densely 

 pubescent, as long as or longer than the internodes. Ligule nearly obsolete. 

 Blades 1 to 2.3 dm. long, 3 to 6 mm. wide, linear to linear-lanceolate, flat or the 

 lower ones involute, rounded at the base, long-acurainate pointed, strongly 

 nerved, strigose-pubesceut throughout, sparsely hirsute along the nerves, sca- 

 brous on the cartilaginous margins. Spike stout, ^erect, exserted, 8 to 12 cm. 

 long. Empty glumes with the awn 5 to 6 cm. long, entire or bifid, scabrous, long- 

 awned, divaricate. Flowering glumes 8 to 10 mm. long, lanceolate, rounded on 

 the back, scabrous and glaucous, strongly 3-nerved above, the middle awn stout, 

 recurved, scabrous, 5 to 7 cm. long, the lateral ones 1 to 2 mm. long. Palea 

 nearly as long as the flowering glume; bifid, with two short awns, ciliate along 

 the nerves above. 



Type collected by P. A. Eydberg, No. 3298, Sheep Creek, Montana, August 8, 1896. 

 Also collected by Charles A. Geyer, June 10, 1839, " in heavy ferruginous loam, 

 Missouri, James and Shienne River valleys," probably at the eastern border of 

 the Bad Lauds, above Mandan, N. Dak. 



S. atrigosum difters from S. montanum in the very long, less rigid, more strongly 

 nerved culm leaves, the uppermost nearly as long as or much exceeding the 

 spike, those of the innovations half the length of the culm. The flowering 

 glumes are more scabrous and shorter. This may be Rafinesque's S. elymoides. 



16. SITANION MOLLE J. G. Smith, sp. nov. 



Culms stout, erect, rigid, 3 to 4 dm. high, clothed at the base with dead leaf-sheaths, 

 terete, striate, pubescent. Innovations about half as long as the culm. Nodes 

 glabrous. Sheaths rather loose, open at the throat, longer than the internodes, 

 pubescent, the lower ones sparsely hirsute along the nerves, the upper puberu- 

 lent and scabrous on the nerves. Ligule entire, almost obsolete. Blades rigid, 

 erect or ascending, linear, long-acuminate pointed, 8 to 15 cm. long, 3 to 5 mm. 

 wide, the uppermost longer than the spike, soft-pubescent throughout, scab- 

 rous along the cartilaginous margins, on the nerves above and along the mid- 

 rib beneath. Spike 7 to 8 cm. long, erect, loosely flowered, shortly exserted. 

 Empty glumes 4, entire or unequally bifid, subulate-setaceous, 6 to 7.5 cm. long, 

 scabrous, divaricate. Lowest floret of one of the spikelets sterile and like the 

 empty glumes. Flowering glume of the lowest hermaphrodite floret linear- 

 lanceolate, acute, 1 cm. long, smooth and shining, glaucous, trifid, or entire, 

 tipped with a stout, spreading, scabrous awn 5 to 7 cm. loug. Palea as long as 

 the flowering glume, acute, or bicuspidate scabrous along the nerves. 



Type collected by Shear and Bessey, No. 1469, East Side Buff'alo Pass, Larimer 

 County, Colo., moist, open mountain side, 3,200 m. August 14, 1898. 



S. molle is related to S. montanum. It differs in being finely pubescent throughout. 

 The leaves are longer and less strougly nerved. 



$$^ Hordeiformae. Lowest floret hermaphrodite . Empty glumes 4, entire. 



17. SITANION BREVIFOLIUM J. G. Smith, sp. nov. PI. III. 



Culms 3 to 6 dm. high, terete, stout, erect, obscurely striate, glaucous. Innovations 

 less than half the length of the culms. Nodes glabrous. Sheaths smooth, 

 scarious along the margins, glaucous, longer than the internodes, the uppermost 

 much elongated, the lower sometimes pubescent or hirsute. Ligule almost 



20775— No. 18 2 



