No. II. 

 CALAMAGROSTIS TWEEDYI Sciibn. Coiitr. Nat. lleil.. iii. 83. 



I'Idiit jH'reuuial. limscly tul'tcd. stolunifcioiis. 



Ciilmx ert'ft, smootli, robust, thick. 3 to 3.i feet liigb. 



Lt'arcs from the base, Hat, lanceohite, slifihtly hispid, 5 U> 10 inches loii},', 4 to 5 

 lines wide. Leaves of culm 1' or .5 ; sheaths ratlier loo.se, striate, smooth or sli<;htly 

 scabrous above, shorter than the internodes; blades flat, erect, hispid. 1 to .'5 inches 

 long; ligule thin, membranaceous, decurreut, 3 Ut 4 lines hmg. 



InflorcHveniT a close, erect, oblong panicle 3 to 4 inches hmg, j inch tliick; rays "> 

 to many, crowded in 12 to 15 dusters, a])iiressed, uneciual, an inch long or less, the 

 longer spikelet-bearing above the middle, tlie shorter crowdeil to the base. 



iS/>iAe/e/«short-i)ediceled, turgid, 1 flowered, 3 lines long; empty ghimes lanceolate, 

 acute, nearly smooth : first glume 1 -nerved, .slightly carinatt-: second glume 3-nerved, 

 convex, 3 lines long; floral glume ovate-oblong, unequally toothed at the rouTidcd 

 aiiex, minutely scabrid, 4nerved, I'i lines long; awn attached \ way from the base 

 of the glume, twisted and bent, 3 to 4 lines long; hairs of the callus .short and unequal, 

 those of the rudiment half as long as the glume: i)alet lance-oblong, obtuse, thin, 

 smooth, li-nerved, ~ lines long; grain oblong, yellow, opaque. 1] lines long. 



Platk XLIV; a, spikelet, enlarged 5 times; i. empty glumes, spread apart: r, 

 floral glume, side view; d, palet, dorsal view; e, rudiment and palet; /, floret and 

 rudiment. 



Cascade Mountains, Washington. 



