90 ME. G. BENO^HAM ON GEAMINEJ!. 



tion of the rhachilla, which I have never found in G. pendula, 

 Trin. (C. expansa, Link, G. latifolia, G-riseb.). Several Americau 

 or other grasses published as species of Ginna are now referred to 

 Mpicampes or Deyeuxia. 



27. Gasteidhtm, Beauv., has two species from the Mediterra- 

 nean region, one of them also found in tropical Africa and in 

 extratropical South America, but possibly introduced only in. the 

 latter locality. They have the small spikelets of Agrostis, but a 

 narrower closer panicle, and are remarkable for the outer glumes 

 rather hardened, shining, and ventricose at the base, whence the 

 generic name. The older authors included them in Milium on 

 account of that hardness in the glumes. 



28. Chjetoteopis, Kunth, is a single Chilian species which 

 some would unite with Agrostis, and might well have been joined 

 to Hpicampes, but that the rhachilla is produced beyond the 

 flower into a rather long hairlike seta. 



29. Teiplachne, Link, is the Gastridimn nitens, Coss. etDur., 

 a single Mediterranean species, with the habit, but not the ven- 

 tricose glumes, of that genus, and differing both from that and 

 from Agrostis in the flowering glume bearing a short awn-like 

 point on each side of the awn. 



30. Apeka, Adans. (Anemagrostis, Trin.), has two very closely 

 allied European species extending into Western Asia, with the 

 technical character very nearly of Deyeuxia, but with the elegant 

 panicle and numerous small glabrous spikelets of many sjiecies of 

 Agrostis, in whicli they are still included by some under the name 

 of Agrostis spica-venti. The New-Zealand plant described by 

 Hook. f. as an Apera is now transferred to MueMenbergia. 



31. CiNKAGEOSTis, Q-riseb., from Tucuman in South America, 

 is unknown to me, but is said to differ from Deyeuxia in having 

 the spikelets unisexual by abortion. It should most probably be 

 incorporated in that genus. 



32. Detetjiia, Clarion {Lachnagrostis, Trin.), has now nearly 

 a hundred and twenty species, dispersed over the temperate or 

 mountain regions of the globe, particularly numerous in the 

 Andes of South America, and extending northwards to the Arctic 

 circle and southwards to the extreme end of South America. It 

 is in some respects polymorphous, running on the one hand 

 almost into Agrostis, to which some species have been referred, 

 and on the other into Galamagrostis, with which the northern 

 species have been often united. It differs from both in the pro- 



