VI. plants: wrigiitianj:. 101 



name has no particular applicability to the present species (tlie stems of which are 

 by no means brittle or fragile), nor apparently to Nuttall's plt^nt either. The 

 genus may be provisionally referred, I think, to the Senecionidea; of the subtribe 

 Senecionese. 



CiRSiuM Wrightii (sp. nov.) : caule elato (3 - 9-pedali) superne corymboso-pani- 

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

 mum glabrescentibus, radicalibus magnis profunde pinnatifidis in petiolum superne 

 lobulatum inferne spinosum attenuatis, caulinis pinnatifido-sinuatis basi attenuatis 

 in caulem leviter decurrentibus dentibus marginibusque spinulosis, ramealibus parvis 

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

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

 leucis. — C. altissimum, var. Gray, PL Wru/ht. j). 125. no. 40G. — Around springs 

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

 A taU species, which in the former collection 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 hemispheri- 

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

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

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

 leaves of C. Wrightii are about two feet long ; the cauline a foot or more in length ; 

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

 an inch in length. 



C. ViRGiNiANUM, 3Iickv. var. j. Tort: ^ Gray, Fl. 2. p. 458. Low and grassy 

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

 (1291.) 



C. UNDULATUM, Spreug. ; Torr. §• Gray, I c. ; Gray, PL Wriyht. p. 125. Prai- 

 ries from Howard's Creek, Western 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 Creek ; Oct. (1293.) Another 

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

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



C. ocHRocENTRUM, Gray, PI. 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, intmns 

 linearibus acuminatis fere inermibus. (C. canescens, Gray, PI. Fendl /). 110 1 baud 

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

 spreading involucral scales.) — Side of the Organ Mountains, northeast ot LI Paso ; 

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



PL. WR. 14. 



