^ 



VI 



PLANT^ WRIGHTrAN.^, 



101 



name 



particular applicability to the present species (the stems of 



by no means brittle or fragile), nor apparently to NuttalFs plant either. The 



genus may be provisionally rcferred, I think, to the SenecionidciE of the subtrib 

 Senecionese. 



CmsiuM Wrightii (sp. nov.) : caule elato (3 - 9-pedali) superne corymb 



culato polycephalo; foliis cum ramis utrinque tenuiter arachnoideo-lanuginosis de- 

 mum glabrescentibus, radicalibus magnis profunde pinnatifidis in petiolum supcrne 

 lobulatum inferne spinosum attenuatis, caulinis pinnatifido-sinuatis basi attenuatis 

 in caulem leviter decurrentibus dentibus margiuibusque spiuulosis, ramealibus parvis 

 sensim ad bracteas subulatas reductis ; capitulis nudis parvulis ; involucri hcmi- 

 sphaerici squamis subulatis appressis cuspidato-apiculatis ; corollis carneis vel ochro- 

 leucis. — C. altissimum, var. Gray, Fl, Wnght p. 125. no. 406. — Around springs 

 near San Bernardino, on the borders of New Mexico and Sonora ; Oct. (1290.) 

 A tall species, which in the former coUection I took for a variety of C. altissimum. 

 From that it obviously differs in the thin and cobwebby, and rather deciduous pu- 

 bescence, the naked peduncles and heads, as well as in the shorter and hemisphcri- 

 cal involucre, the scales of which are barely callous-pointed, but not spinescent It 

 should stand next to C. muticum, which has a differently shaped involucre, with 

 broader and blunter scales, shorter peduncles, more divided leaves, &c. The radical 



leaves of C. Wrightii are about two feet long 



foot 



b 



those of the flowering branches one or two inches, or still smaller. Heads barely 



an inch in length. 



C. ViRGiNiANUM, Michoc. var. y. Torr. §* Gray, Fl. 2. p. 458. Low and grassy 

 flats arouiid Escondido Springs, between the Pecos and the Limpio ; June. 

 (1291.) 



C. UNDULATUM, Spre?i(/. ; Torr. 8f Gray, l c, ; Gray^ Pl, Wright. p. 125. Vi 



from Howard's Creek, Wcstern Texas, to the Limpio; May. (1292.) — Two 

 or three forms. One or two very spinose specimens make a transition to C. ochro- 

 centrum. Also, with smaller heads, on Coppermine (5reek ; Oct. (1293.) Another 

 variety, with numerous lanceolate lobes to the"elongated leaves, was gathered be- 

 tween the Barbocomori and Santa Cruz, Sonora. (1294.) 



C. ocTiRocENTRUM, Grag, Pl. Fendl.p. 110. Sandy banks of the Rio Grande above 

 Dona Ana ; Sept. (1295.) — The leaves are perfectly crowded with long, yellowish 

 spines, and similar spines tip the scales of the involucre. Yet I fear it is only an 

 extreme form of the polymorphous C. undulatum. 



C. Neo-Mexicanum (sp. nov.) : foliis lanceolatis seu oblongo-linearibus sinuato- 

 pinnatifidis spinosis utrinque cauleque arachnoideo-lanatis incanis, caulinis basi an- 

 gusta spinosa decurrentibus, radicalibus subpetiolatis ; capitulis solitariis vel sub- 

 corymbosis subglobosis erectis ; involucro arachnoideo-lanato, squamis lanceolatis, 

 exterioribus apice foliaceo patulo vel recurvo in spinam subulato-productis, intunis 

 linearibus acuminatis fere inermibus. (C. canescens, Grai/, Pl. Fendl. p.llOl haud 

 Nutt, is probably a variety of this, with smaller and morc numerous heads, and less 

 spreading involucral scales.) — Side of the Organ Mountains, northeast of El Taso ; 

 April. (1417.) — «Stem 2-4 feet high, somewhat branching"; the branchcs 



PL. WR. 14. 



* 



