No. 31. 

 AGROSTIS EXARATA Triu. forma ASPERFOLIA Vasey. 



Plant annual, not tufted, pale green throughout or purplish in the inflorescence. 



Culm erect or slightly geniculate below, rather robust, nearly smooth, at length 

 naked above, 2 to 3 feet high. 



Leaves of culm 3 or 4; sheaths rather loose, striate, smooth, the lower exceeding 

 the internodes, the upper usually shorter; blades flat, scabrous on both sides, slender- 

 pointed, 2 to 3 lines wide, 3 to 6 inches long; ligule almost herbaceous, striate, obtuse, 

 decurrent, 3 to 4 lines long. 



Inflorescence a rather dense, narrow, erect, or slightly nodding panicle 6 to 10] 

 inches long, about 1 inch thick; common axis smooth and shining; branches glomer- 

 ate, erect, scabrous, unequal, \ to 2 inches long; the shorter branch bearing spikelets 

 to the base, the longer naked below. 



Spilcelets on hispid pedicels nearly equaling themselves, narrowly lanceolate, turgid, 

 1-flowered, 1 to li lines long; first empty glume lance-ovate, acute, slender-pointed, 

 carinate above, hispidulous throughout, hispid on the keel, 1 to 1£ lines long; second 

 empty glume same as first, but smoother and ^ to ^ line shorter; floral glume broadly 

 oblong, minutely dentate at the truncate apex, thin -membranaceous, 5-nerved to thei 

 apex, | line long, with a slight, short, pilose callus at the base; palet minute or! 

 wanting; grain spindle-shaped, yellow, opaque, £ line long. 



Plate XXXI; a, spikelet enlarged about 12 times; b 7 floral glume, dorsal view.! 



California to Washington. 



