Agrostis. | GRAMINEZ. 867 
ligules oblong, obtuse, lacerate. Panicle very long and narrow, 
14-4 in. by 4-4 in. broad, erect, pale-green; rhachis minutely sca- 
berulous ; branches few, fascicled, very short, erect ; pedicels short, 
capillary, scaberulous. Spikelets 4-4, in. long, pale. Two outer 
glumes subequal, lanceolate, acute, shining, 1-nerved, slightly 
scabrid on the keel, smooth on the sides; 3rd or flowering glume 
about + shorter, ovate-lanceolate, thin and hyaline, truncate, mi- 
nutely denticulate, glabrous, faintly 5-nerved, awn wanting. Grain 
oblong. 
SourH Isuanp: Canterbury—Broken River, Petrie! Porter River, Kirk! 
Otago—Macrae’s, Lake Wakatipu, Petrie ! 1000-3000 ft. 
A very distinct species, easily recognised by the very slender habit, exces- 
sively narrow pale-green panicle, and small shining spikelets. 
18. DEYEUXIA, Clarion. 
Annual or perennial grasses. Leaves flat or involute; ligules 
membranous. Spikelets small, 1-flowered, arranged in effuse or 
contracted or spike-like panicles with capillary whorled branches ; 
rhachilla disarticulating above the 2 outer glumes, produced beyond 
the flower into a silky bristle. Glumes 3; 2 outer equal or sub- 
equal, persistent, empty, keeled, acute, not awned, usually 1-nerved ; 
3rd or flowering glume shorter than the empty glumes or equalling 
them, thin and hyaline or rigidly membranous or almost coriaceous, 
5-nerved, entire or 2—4-dentate, callus at the base silky; awn 
generally present, straight or twisted, inserted above or below the 
middle of the glume. Palea more than half as long as the flowering 
glume or almost equalling it, thin, 2-nerved or 2-keeled. Stamens 3. 
Styles distinct, short; stigmas plumose. Grain oblong or obovoid, 
enclosed w thin the flowering glume and palea. 
Species over 100, widely dispersed through the temperate regions of both 
hemispheres, particularly abundant in Andine South America. It is not at all 
easy to separate Deyeuxia from the allied genera Agrostis and Calamagrostis, 
and of late many authors, including Hackel, have placed the majority of 
species under the latter genus. It appears to me, however, that there is much 
to be said in favour of the arrangement proposed in Hooker’s ‘‘ Flora of British 
India”’ (Vol. vii., p. 253), where Agrostis is limited to species in which the rhachilla 
is not produced at the back of the flower, and in which the callus of the flower- 
ing glume is naked or nearly so, Calamagrostis containing those in which there 
is also no prolongation of the rhachilla, but which have the callus villous with 
long hairs, while in Deyewxia the species have both an elongated rhachilla and 
hairy callus. Understood in this sense, there are 7 New Zealand species of the 
genus, 3 of which extend to Australia and Tasmania, the remaining 4 being 
endemic. 
* Flowering glume 4-4 shorter than the empty glumes, thin and hyaline. 
Panicle very broad and lax; branches long, spreading, capillary. 
Spikelets j4-4in. Flowering glume silky, truncate, 
minutely 4-denticulate ; awn from the middle of the 
back 3° fe ye se a6 te lige teHiorstents 
