OF ARTS AND SCIENCES. 123 



Meyeni (Baccharis quadranguJaris, Meyen, Dolichogyne lepidophylla, 

 Wecld.) is paralleled in Pteronia and Aplopappus, &c. I should there- 

 fore propose to keep up the two genera, LepidophyUmn and Nardophyl- 

 lum, and refer to the former (as above) Weddell's Dolichogyne lepido- 

 phylla, which he has figured, and probably his D. rigida and D. rupes- 

 tris, with linear leaves. The nearest relatives of both genera (if we 

 may distinguish them as genera) inhabit the corresponding cool and 

 dry portion of the northern part of the American Continent, where they 

 constitute similar features in the vegetation, i. e. are mostly social, fru- 

 tescent plants on naked plains or plateaux, — Nuttall's Ghrysothamnus 

 (section of Linosyris, Torr. & Gray) strictly representing Nardophyl- 

 lum, and his Ericameria being analogous to Lepidophyllitm. Taken in 

 connection with geographical distribution, slight characters in the pap- 

 pus (though weakened in L. ( Ghrysothamnus) Bigelovii) and in the style 

 may serve to separate the North American from the South Ameri- 

 can species. Yet in a general system and under a truer valuation of 

 generic characters, they may well be combined. To Nardophyllum 

 belongs : — 



Nardophyllum Kingii the ddliotrichwm Kingii, Hook. f. Fl. 

 Antarc, this being a strict congener of N. revolutum, and therefore the 

 following, of which I have no specimens to examine ; and which j)er- 

 haps are not all specifically distinct : — 



Nardophyllum humile. GhHiotrichum hiimile, Hook. f. Anac- 

 tinia Hookeri, Remy. 



Nardophyllum Darwini. GhHiotrichum Danoini, Hook. f. 



Nardophyllum chiliotrichoides. Dolichogyne chiliotrichoides, 

 Remy. — Weddell's Dolichogyne armata, with the branches of the style 

 subspatulate and obtuse, appears doubtful. 



Baccharis Gilliesii (sp. nov. B. paucidentata, var. ^. Hook. & 

 Arn. pi. masc.) : herbacea e basi lignescente, glabra, humilis ; caule ra- 

 mosissimo ; ramis corymbosis gracilibus striato-angulatis foliosis, ulti- 

 mis capitulo solitario terminatis ; foliis sessilibus leviter uninerviis 

 aveniis, caulinis linearibus basi attenuatis integerrimis sen dentes 2-4 

 patentes gerentibus, ramealibus parvis angustissimis ; involucro campa- 

 nulato, squamis oblongis obtusissimis coriaceis dorso herbaceis margine 

 tenuiter scariosis apice lanato-ciliatis ; acheniis glaberrimis ; pappo 

 foemineo involucrum ter superante. — Rio Negro, North Patagonia : 

 also gathered by Tweedie, and at Buenos Ayres by Gillies. One 

 specimen in the Hookerian herbarium is ticketed B. nana, Don, a 



