99 



NEW AND NOTEWORTHY NORTHWESTERN 

 PLANTS.— I. 



By C. V. Piper. 



Sitanion latifolium. Culms tufted, erect or somewhat decum- 

 bent at base, stout, glabrous, terete, striate, about 2 dm. high ; 

 sheaths very loose, rather inflated, smooth and glaucous, strongly- 

 nerved, longer than the internodes, widely open at the throat ; ligule 

 obsolete; blades short, thickish, rigid, green and glabrous above, 

 glaucous and prominently nerved beneath, 3-8 cm. long, 5-7 mm. 

 broad, lanceolate, acute, flat, becoming involute at the margins ; 

 spike 4-6 cm. long, stout, erect, its base enclosed in the upper leaf- 

 sheath ; spikelets mostly three at each joint; empty glumes or their 

 divisions mostly 8, sometimes 6, stout, subulate, flexuous, divaricate, 

 2-4.5 cm. long, scabrous on the nerves and awn ; flowering glume 

 [ 7-8 mm. long, lanceolate, glaucous, smooth near the base, scabrid 

 near the apex, bifid, armed with a stout awn 1-3 cm. long; palet 

 nearly equaling the glume, 2-toothed at the apex, scabrous on the 

 nerves ; internodes of the rachis flattened, broadest above, scabrous 

 on the margins, 2-3 mm. long. 



Blue Mts., Walla Walla County, AVash., 15 July, 1896. Nearly 

 related to S. rigidum, J. G. Smith. 



Sitanion f lexuosum. ( § Elymoides.) — Culms densely tufted, 6 

 to 9 dm. high, terete, striate, smooth, shining; sheaths striate, closely 

 fitting the stem, open in the throat, a little shorter than the 

 internodes, those of the basal leaves sparsely villose, those of the 

 culm glabrous; ligule minute; blades 4 to 12 cm. long, about 2 

 mm. wide, linear, acuminate, involute, strigose pubescent above, 

 densely strigulose beneath, or the uppermost nearly glabrous; spikes 

 slender, erect, flexuous, 8 cm. long, pale green, long exserted ; 

 spikelets one or two to each joint, broadly lanceolate, compressed 

 empty glumes subulate-setaceous, 3 to 4 mm. long, 3 to 5 nerved 

 scabrous on the back, tipped with an awn 9 to 10 mm. long, 

 sometimes with two very short lateral ones in addition; flowering 

 glume 8 mm. long, lanceolate, smooth and rounded on the back 

 below, minutely scabrid and 5-nerved above, bifid, tipped with a 



