No. 12. 

 STIPA PARI SHI I Vasey, Bot. Gaz. vii. 32. 



Plant perennial, tufted, somewhat bulbous, with coarse, woolly roots. 



Culm erect, simple, terete, hispid, thickly clothed at base with persistent sheaths, 

 rarely naked above, 1 to 1£ feet high. 



Leaves of the culm 4 or 5 crowded below with short, overlapping smooth or scab- 

 rous sheaths, white-hairy at the throat, and divergent conduplicate or involute blades, 

 smooth below and hispid above, 6 inches long; upper sheaths longer and vaginate, 

 inclosing the lower part of the panicle, with a narrow, convolute, nearly erect blade, 

 3 inches long; ligule very short. 



Inflorescence a rather open, erect panicle 5 to 8 inches long; branches in twos or 

 threes, 2 inches or less long, bearing 5 to 10 spikelets on slender branchlets. 



Spikelets 1-flowered, G to 7 lines long; empty glumes spreading, lanceolate, slender- 

 pointed, concave, rather thick, smooth; first glume 3-nerved to 7 lines long; second 

 glume a line shorter and 5-nerved, the lateral nerves often obscure ; stipe curved, 

 slender, acute, yellow-bearded at the middle, £ line long; floret spindle-shaped, 2 J to 3 

 lines long, less than % line thick; floral glume bidentate at apex with two naked, 

 hyaline teeth § line long, densely clothed elsewhere with stiff, white hairs 2 lines long, 

 chartaceous, obscurely 5-nerved; awn smooth below, scabrous above, lines long; 

 palet oblong, barely acute, boat-shaped, pubescent, with long hairs between the 2 

 nerves, adherent to the grain; lodicules narrow, 1 line long; authers naked; grain 

 spindle-shaped, tapering to the beaked apex, nearly terete, light brown or olive, 2 lines 

 long, £ line thick. 



Plate XII; a, spikelet enlarged twice; &, empty glumes; c, floret; <1, floral 

 glume opened showing the teeth at the apex; e, palet, side and back views. 



Mountains of southern and Lower California. 





