No. 40. 

 CALAMAGROSTIS DENSA Vasey, Bot. Gaz. xvi. 147. 



Pteni perennial, from strong root stocks densely tufted or in large patches. 



Culms erect, stout, nearly smooth or slightly hispid just below the black con- 

 stricted nodes, 3 to 4 feet high. 



Leaves of culm 4 to 5; sheaths rather loose, striate, hispid, the lower exceeding 

 the internodes, the upper one including the base of the panicle, middle ones little 

 shorter than the internodes; blades flat near the base, involute toward the long, atten- 

 uate points, hispid on both sides, or nearly smooth beneath, 1 foot long or less, 3 to 4 

 lines wide ; ligule lacerate, 2 to 3 lines long. 



Inflorescence a narrow, lance-oblong, densely flowered panicle, 4 to 6 inches long, 

 £ inch thick; rays semiverti dilate in a kind of collar on the slightly hispid rachis, 

 appressed, 1 inch long or less, densely crowded to the base with nearly sessile spikelets. 



Spikelets narrow, l-flowerecl, 2£ lines long; empty glumes, equal, lanceolate, acute; 

 first glume carinate and 1-nerved; second glume concave, 3-nerved, minutely hispid 

 on the nerves, 2£ lines long; floral glume oblong; 4-toothed at the 2-lobed apex, 

 smooth, 4-nerved, 2 lines long; hairs of the rudiment half as long as the glume, of 

 the callus shorter ; awn attached below the middle, equaling or slightly exceeding 

 the glume; palet linear-oblong, bidentate at the apex, thin, 2-nerved, 1£ lines long; 

 grain narrowly oblong. 



Plate XL; a, em] 

 and palet spread apart; c, floral glume, dorsal view. 



Southern California. 



