22 



Differs from C. alcnfica iu its smaller size; more slender habit; culms and sheaths 

 very slightly or not at all twisted; ligiile usually longer ; sheaths bearded at 

 junction Avith the blades; blades shorter and much narrower, more strongly 

 inrolute ; panicle narrow, spike-like, densely flowered ; spikelets less compressed ; 

 empty glumes less strongly keeled and thinner; flowering glume shorter; awn 

 longer and attacheil lower; callus hairs fewer and altogether lateral, and pro- 

 longation of the rachilla with its hairs always exceeding those of the callus. 



15. CALAMAGROSTIS SUBFLEXUOSA Kearney, sp. n. 



Cajspitose, of rather soft texture, pale but not glanCDUS, with slender, creeping root- 

 stocks, erect or ascending innovations 1 dm. or less high, rather slender culms 

 very leafy toward base, and narrow, densely flowered panicles. Culms 5 to 10 

 dm. high, erect, usually slightly compressed toward base, somewhat closely 

 enveloped toward base by the rather long, thin, often somewhat twisted marces- 

 cent sheaths; internodes 3 to 4 (usually 4) flually much exceeding their sheaths, 

 the uppermost considerably exceeding both sheath and blade. Sheaths rather 

 loose, the lower ones obscurely pubescent at summit, elsewhere glabrous, or very 

 nearly so. Ligule 2 to 4 mm. long, slightly narrowed to the truncate apex, thin. 

 Blades (lower and of innovations) 1 to 2. .5 dm. long; (uppermost), .5 to 1 dm. 

 long, all 2 to 4 mm. wide, strongly involute, slightly scabrous on the margins 

 and nerves, the lower erect, the uiiper more or less spreading. Panicle 1 to 2 

 dm. lon<>-, 1 to 2 cm. wide, oblong lanceolate, acutish or occasionally acuminate, 

 strongly contracted, almost spiciform, many-flowered, erect, usually somewhat 

 flexuous, often somewhat interrupted, or even slightly lobed, pale brown tinged 

 with pale purple, rachis rather slender, minutely scabrous especially toward 

 apex, its lowest internode 2 to 3.5 cm. long; branches sleiuler, somewhat flexuous, 

 minutely hispidulous, densely flowered, erect or nearly so, the lower primary 

 branches in 4's to 6's, the longest 2.5 to 6 (mostly 5) cm. long. Spikelets 4 to 5 

 mm. long. Empty glumes lanceolate, acute or short acuminate, rather sharply 

 keeled, flrni membranous, minutely scabrous on the keels, elsewhere glabrous, 

 tinged with red-purple, equal or the first slightly longer. Flowering glume, 

 enualing or slightly shorter than the second empty glume, oblong ovate, broadly 

 truncate, minutely to rather conspicuously 4-dentate, thin memljranous, rather 

 firm, somewhat scabrous on the back, sometimes tinged with purple; awn 

 attached one-sixth to one-fifth above the l)ase, slightly -shorter than to slightly 

 exceeding the glume, stout, minutely scabrous, bent somewhat above the mid- 

 dle, the lower part somewhat twisted, the upper part divergent at an angle of 

 45 degrees or less, usually somewhat exserted. Palea equaling or slightly exceed- 

 ing the flowering glume, oblong lanceolate, narrowly truncate, minutely biden- 

 tate, thin meml)ranous, minutely scabrous on the keels. Anthers about 2 mm. 

 long. Callus hairs sparse, rather stifl', the longer (lateral) onts two-flfths to 

 three-fifths as long as the flowering glume, dorsal ones ranch shorter. I'rolou- 

 gation of the rachilla rather sparsely bearded, with its hairs considerably 

 exceeiling the longer callus hairs, sometimes only one-fifth shorter than the palea. 

 Type specimen in the United States National Herbarium collected at Oakland, Cal., 



by II.N. Bolander (2274). 

 Apparently intermediate between C. sith-sdorjii and C. uuguata. From C. suksdorjii it 

 differs in its less rigid and wiry culms; long, narrow, dense, not lucid, brownish- 

 purple panicle; strongly keeled empty glumes; flowering glume nearly or quite 

 equaling the empty ones; shorter awn ; usually longer callus hairs and larger 

 anthers. From C.aiujmta it is distinguished by its less rigid habit, more flex- 

 uous panicle with longer branches, smaller spikelets, less scabrons and usually 

 longer flowering glume, and smaller anthers. 



