CATALOGUE. 283 
VILFA RIGENS, Trin. ?—Culm erect, 2-3° high, simple; leaves erect, 
coriaceous, convolute, pungent; radical ones very long (1° or more); 
panicle strict, erect, 1-14° long, interrupted below, the base frequently 
included in the upper sheath; rays short, appressed, floriferous to the 
base; spikelets 2’ long, smooth; inferior glume one-fourth shorter than 
the valve. Arizona, 1871 and 1872. 
AGROSTIS PERENNANS, Tuck. ?—Wet ground among the timber; Colo- 
rado, 1873 (1085). ; 
Agrostis scaBra, Willd—Low ground, Twin Lakes, Colorado, 1873 
(1083); South Park, Colorado, 1873 (1084) ; Willow Spring, Arizona, 1874 
(225). A very slender form. 
Agrostis ExaraTa, Trin. (Watson’s Botany 40th Parallel)—Twin 
Lakes, Colorado, 1873 (1086); Camp Apache, Arizona, 1874 (258). 
AGrostis vERTICILLATA, Vill.—Root fibrous, culm procumbent, genic- 
ulate at the rooting or ascending nodes, sheaths smooth or pubescent, ligule 
1-2” long; leaves lanceolate-linear, 1-3’ long, 1-3” broad, scabrous on 
the margins and above, rarely glabrous; panicle dense, 1-4’ long, more 
or less interrupted below; rays more or less verticillate (3-8 together), at 
the base branching and densely floriferous; glumes acute, nearly equal, 
1-nerved; palets subequal, awnless, § to $ shorter than the glumes—Camp 
Bowie, Arizona, 1874 (449); Central New Mexico, 1874 (114). 
Aarostis vunearis, With—Twin Lakes, Colorado, 1873 (1057); 
probably introduced. 
MUULENBERGIA DISTICHOPHYLLA, Kunth—Root firm, fibrous; culm 
erect, 3-4° high, smooth, compressed, sheathed at the base by the dis- 
tichous, coarse sheaths; leaves very long, rigid, flat or somewhat involute, 
compressed at the base, scabrous on the margin and keel; panicle often 
1° or more long, contracted; rays solitary, thin, appressed, branched ; 
glumes subequal, scabrous-on the back, shorter than the palets; inferior 
palet 3-nerved, short pilose on the margin below; apex prolonged into a 
bristle 24 to 5’ long; superior palet 2-nerved. The awn is wanting in 
some forms.—Rocky Cafion, Arizona, 1874 (282); an awnless form (283). 
MuauenserciA Trexana, Thurb. (Synopsis of Flora of Colorada, p. 
144),—Arizona, 1871; Cienega, Arizona, 1874 (574). 
