No. 88. 



DUPONTIA PSILOSANTHA viu. FT.AVESCENS (Hodk. & Am.) Chiseb. 

 in Lodcb. Fl. Uoss. i v. 380 (1853); 1). Fisheri var. Jiavenvens Hook. & Arn. J3ot. 

 IJoecli. 132 (1841). 



riinit port'iinial, scarcely tufted, from a creepiiifr rontstock. 



Culms erect, simple, terete, siuootli, rather robust, 12 to IS iiiclies tall. 



Leaves of culm 2 or 3; slieaths rather loose, smooth, open above, equaling or 

 exceeding tlie intcrnodes; blades flat, or involute toward the points, smooth, 2 to 3 

 inches long; ligule thin, nicinl)ranaceous, truncate-obtuse, erose or lacerate, 1 line long. 



Injlorencence a loose, pyramidal, erect panicle 2 to 4 inches long; rays divergent, 

 horizontal or detlcxcd, in twos or threes at the 4 or 5 rather distant nodes of the 

 smooth, rigid, common axis, smooth, 2 inches long or less, bearing 3 to (> pedicellate 

 spikelets mostly near the extremities. 



Spikclets spindle shaped, turgid, 3 lines long, 1-flowered, with a narrow, linear 

 rudiment; emiity glumes ovate, acute, involute toward the thin, golden apexes, making 

 them appear acuminate and attenuate, smooth, puri^lish below, the first l-nervt'd, 2iJ 

 lines long, the second 3-nerved below and { line longer; Horal glume ovate-lanceolate, 

 acute, smooth, 3-nerved, 2i lines long; palet broadly lance-oblong, eraarginate, nearly 

 smooth on the 2 keels; grain elliptical; lodicules 1 or 2, rather prominent, broad and 

 dentate above. 



I'LATE LXXXVTII; a, spikelot slightly opened; ft, spikclet slightly dissected, 

 showing the linear rudiment at tlie base of the doret; e, first empty glume; </, second 

 empty glume; e, floral glume;/, palet open; g, pistil and lodicules. 



In the Botany of Beechey's "Voyage a 2-flowered form is mentioned, which is not 

 represented in the National Herbarium. Tveadily distinguished by the golden yellow 

 emi)ty glumes and the smooth, acute floral glume. Alaska and perhaps elsewhere in 

 Arctic America. 



