Xo. 



AGROSTIS ^EQUIVALVIS Trim Agrost. i. 116. 



Plant probably perennial, tufted, with slender, knotted rootstoeks, pale green with 

 usually purple inflorescence. 



Culms erect, slender, smooth, simple, 10 to 20 inches high. 



Leaves of culm usually 3; sheaths close, smooth, lower exceeding the internodes; 

 second shorter, upper much longer than the lower but at length exceeded by the grow- 

 ing culm; blades flat, nearly smooth, thin, erect, 1£ lines wide, lower 3 to 6 inches, 

 upper 2 to 3 inches long; ligule membranaceous, obtuse, 1 line long. 



Inflorescence a rather narrow, loose panicle 3 to 5 inches long, usually included at 

 the base until maturity; common rachis slender, smooth; branches 2 to 5, semiverti- 

 cillate at the rather distant nodes, slender, minutely roughened, at length spreading, 

 ■A to 1J inches long, spikelet- bearing beyond the middle. 



Spikelets on pedicels usually equaling or exceeding themselves, lanceolate, turgid, 

 1-flowered, 1 line long; empty glumes nearly equal, or second longer, lanceolate, acute, 

 convex, smooth, 1-nerved, 1 line long; floral glume broadly oblong, obtuse, thin, 

 smooth, 5-nerved, § line long; palet oblong, thin, smooth, 2-nerved, nearly equaling the 

 glume, callous, minute, obscurely pilose; sterile pedicel usually minute, hairy above, 

 I as long ("| as long," Trinius) as the floral glume; grain oblong, greenish-yellow, 

 opaque, \ line long, free. 



Plate XXIX; a, spikelet enlarged 10 times; b, empty glumes; c, floral glume, 

 dorsal view; d, palet. 



California to Alaska, in damp mossy places. One specimen from Sitka, Alaska, 

 Trinius' type locality, differs from those described in the parts of the spikelet being £ 

 larger and the sterile pedicel half as long as the glume. 



