No. 46. 

 TRISETUM CALIFORNICUM Vasey, n. sp. 



Plant apparently annual, loosely tufted, with numerous slender roots. 



Culms geniculate below, spreading, weak, rather slender, branching, velvety- 

 pubescent near the nodes, 10 to 20 inches high. 



Leaves of culm usually 3 ; sheaths rather loose, striate, finely pubescent, retrorsely 

 hispidulous, the lower shorter than the internodes, the upper longer and usually 

 inclosing the base of the panicle; blades flat or folded, erect, finely pubescent, hispidu- 

 lous, 2 to 3 inches long, 1 line wide; ligule obliquely obtuse, somewhat lacerate, 1 

 line long or less. 



Inflorescence a narrow, contracted, loose, flexuous panicle, 3 to 4 inches long, 

 somewhat interrupted below; rays erect, mostly in twos, unequal, h to 2 inches long, 

 spikelet-bearing to the base. 



Spikelets on x>edicels £ as long as themselves, obovate, 3-or 4 flowered, 2£ to 3 lines 

 long; empty glumes oblanceolate, barely acute or obtuse, scabro-pubescent, scarious- 

 margined; first glume 3-nerved; second glume broader, 5-nerved, 2 lines long; floral 

 glume ovate-lanceolate, cleft ^ way down from the thin apex, smooth, obscurely 5-nerved, 

 2 to2£ lines long; awn attached below the cleft, bent, 3 to 4 lines long; internode of 

 rachilla £ line long, slightly hairy; palet oblong, spread out above, 2-toothed, thin, 1 

 line long. 



Plate XLVI; figure of the plant taken from a rather young and depauperate 

 specimen; «, spikelet enlarged 7 times; />, empty glumes; c, floral glumes, side view; 

 d, palet, dorsal view. 



Lower California near the boundary and probably extending into southern Cali- 

 ornia. 



