No. 37. 

 CALAMAGROSTIS BREWERI Thurb. Bot. Oal. ii. 280. 



Plant perennial, in small, dense tufts. 



Culms erect, simple, slender, smooth, and wiry, about 1 foot high ; nodes black. 



Leaves from the base, abundant, with scarious sheaths and setaceously involute 

 blades 3 inches long. Leaves of culm usually but one above the base; sheath close, 

 striate, smooth, 1 to 2 inches long; blade erect, scabrid, involute, 1 inch long or less; 

 ligule narrow, acute, 1 line long. 



Inflorescence a loose-spreading panicle 2 to 3 inches long; rays solitary or in twos 

 or threes, spreading or even detlexed, purple, the lower J to 1 inch long, bearing 2 or 

 3 spikelets at the ends. 



Spikelets on pedicels about equaling themselves, turgid, 1 flowered, li to 2 lines long ; 

 empty glumes nearly equal (second slightly longer), lanceolate, acute, convex, purple, 

 SL'arious-margined, smooth, 1-nerved (or second obscurely 3-nerved), 14 to 2 lines long; 

 floral glume oblong, 4-toothed at the obtuse apex, thin, minutely scabrid or nearly 

 smooth, 4-nerved, 1J lines long; hairs of the callus short, of the rudiment § as long- 

 as the glume; awn attached near the base, exserted a line or more; palet oblong, 

 obtuse, or bidentate at the apex, thin, smooth, 1| lines long; grain obloug, flattened, 

 yellow, opaque, % line long; lodicules minute or absent. 



Plate XXXVII; a, empty glumes enlarged 8 times; &, rudiment and floret with 

 glume and palet spread to show the stamens; c, floral glume, dorsal view. 



In the Sierras of California, at an altitude of 9,000 to 10,000 feet. 



