284 BOTANY. 
MUHLENBERGIA PUNGENS, Thurb. (Proc. Acad. Phil. 1863, ee ele 
Synopsis of Flora of Colorado, p. 144).—Fort Garland, Colorado, 1873 
(1088). 
MUHLENBERGIA GRACILLIMA, Torr. (Syn. of Flora of Colorado, p. 144).— 
San Luis Valley, Colorado, 1873 (1091). 
MUBLENBERGIA GRACILIS, Trin. (Steudel, Gram. p. 179).—Root fibrous ; 
culm erect, slender, branching at the base, 8’ to 14 or 24° high, minutely 
scabrous, as well as the sheaths; leaves erect, narrowly linear, 1-12’ long, 
plane or convolute, rigid, retrorsely scabrous; panicle contracted, 2-8’ long; 
branches solitary, appressed ; pedicels very short; glumes ovate, the lower 
1-nerved and acuminate, the upper 3-nerved and 3-toothed, the teeth awl- 
pointed ; palets lance-oblong, 2” long, nearly equal, minutely scabrous, or 
somewhat pubescent on the nerves below, the upper with an awn 2-6” 
long—Twin Lakes, Colorado, 1873 (1089). The species as here defined 
embraces several varieties, two of which are represented in the collections. 
MUHLENBERGIA GRACILIS, Trin., var. BREVIARISTATA.—Cvespitose, low 
(8-12" high), often growing in ring-like patches; leaves very short, 1-3’, 
involute and rigid; panicle short, 2-3’, very close; awn of the upper palet 
' about its own length—Twin Lakes, Colorado, 1873 (1098). 
MoHLENBERGIA GRaciLis, Trin., var. Masor—Culm tall, 2 to 24°, slen- 
der; leaves 6 to 8’ long; panicle 6 to 8’ long, lax, strict; glumes half as 
long as the palets; palets equal, minutely scabrous; awn 3-4 times as 
long as the palet—Mount Graham, Arizona, 1874 (744). These forms 
seem to be sufficiently distinct for species, and may have been described 
under other names. 
_ Mountensereia sytvatica, T. & G., var FLEXUOSA, Vasey, perhaps 
a new species. It is 731, C. Wright, New Mexico.—Culms about 2° long, 
‘slender, branching from the base and the lower half of the culm, the 
branches also floriferous; leaves narrow, 3’ long; panicle graceful, droop- 
ing, loose, somewhat contracted above, 3-5’ long; branches mostly single 
(below somewhat distant), lower ones 14’ long, divided, and flowering to 
the base; pedicels very short; glumes 3 to 3 the length of the flower, 
scarious, lanceolate, acute, 1-nerved, shortly 2-toothed, or with 1 or 2 short 
hairs (sete) at the apex, scabrous on the midrib; palets conspicuously 
