No. 44. 



CALAMAGROSTIS TWEEDYI Scribn. Oontr. Nat. Herb. iii. 83. 



Plant perennial, loosely tufted, stoloniferous. 



Culms ereet, smooth, robust, thick, 3 to 3 J feet high. 



Leaves from the base, flat, lanceolate, slightly hispid, 5 to 10 inches long, 4 to 5 

 lines wide. Leaves of culm 2 or 3; sheaths rather loose, striate, smooth or slightly 

 scabrous above, shorter than the internodes; blades flat, erect, hispid, 1 to 3 inches 

 long ; ligule thin, membranaceous, decurrent, 3 to 4 lines long. 



Inflorescence a close, erect, oblong panicle 3 to 4 inches long, $ inch thick ; rays 5 

 to many, crowded in 12 to 15 clusters, appressed, unequal, an inch long or less, the 

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



SpiTcelets short-pedicel ed, turgid, 1-flowered, 3 lines long; empty glumes lanceolate, 

 acute, nearly smooth ; first glume 1 -nerved, slightly carinate ; second glume 3-nerved, 

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

 apex, minutely scabrid, 4-nerved, 2£ lines long; awn attached J 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; palet lance-oblong, obtuse, thin, 

 smooth, 2-nerved, 2 lines long; grain oblong, yellow, opaque, 1^ lines long. 



Plate XLIV; a, spikelet, enlarged 5 times; b, empty glumes, spread apart; c, 

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

 rudiment. 



Cascade Mountains, Washington. 



