No. 40. 

 CALAMAGROSTIS DENSA Vasey, Bot. da/,, xvi. 147. 



Vhint ixTcnnial. fioiii stioiifi' root stocks densely tufted or in larp- iiatclies. 



Culms ereet, stout, nearly smooth or slifiiitly hispid just below the black ('on- 

 stricted nodes, 3 to 4 feet liigli. 



/,ra(T.v ol' culm 4 to.'); sheafhs I'ather loose, striate, hispid, tlie lower excecdin}; 

 the internodes, the upper one includinj;' the base of the panicle, Jniddl(^ oues litthi 

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

 uate jxiints, hispid on both sides, or nearly smooth beneath, 1 foot lonj^- ui- less, .3 to 4 

 lines wide; liyule lacerate, 2 to .'5 lines Ion};'. 



Inflorescence a narrow, lance-oblong, den.sely tlowered panicle, 4 to (! indies long, 

 i inch thick; rays semiverticillat(^ in :i kind of collar on the slightly liis])i(l racliis, 

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



Spikelets narrow, 1-flowered, 2J lines long; ein])ty glumes, equal, lanceolate, acute; 

 first glume carinate and 1-nerved; second glume conclave, .'5-iierved, minutely hisjiid 

 on the nerves, L'i lines long; Horal glume oblong; 4-toothed at the I'-lobed aiiex, 

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

 the callus .shorti'r; awn attached below the middle, equaling or slightly exceeding 

 t)ie glume; palet linear-oblong, bidentate at the apex, thin, 2-uerved, l.i lines long; 

 grain narrowly oblong. 



I'l.ATt'", XL; <t, empty glumes spread apart, enlarged (! times; h, tlorct witli glume 

 and jialet sjiread apart: r. Hoial glume, dorsal view. 



Southern Califoinia. 



