46 PROCEEDINGS OF THE AMERICAN ACADEMY 



++ ■!■+ Corolla limbo infequaliter vel subasqnaliter 5-fi(lo, lobis fauce 

 pi. m. brevioribus : folia subtus laua araiieosa ssepissime dealbata, 

 supra glabrescentia. 



C. Californicus. Suborgyalis ; capitulis solitariis vel paucis 

 nudis ; involucro tenuiter lanato mox glabrato, squamis in appendiceal 

 subulatam patulam ssepius validam productis ; floribus albis vel ochro- 

 leucis. Cirsium Californicum Gray in Bot. Whipp. p. 56. — Califor- 

 nia,'.from Stanislaus River (Bigelow) and Santa Clara Co. (Brewer) 

 to near San Diego (Cooi^er) ; and some forms of it apparently on the 

 frontiers of Nevada. Cirsium fuliosuin Eaton in Bot. King, as to 

 Watson's specimens, is probably a form of this species ; but the corollas 

 are said to be purplish. 



C. HooKERiANUS. Caule 1-3-pedali ad apicem folioso; capitulis 

 subsolitariis vel glomeratis majusculis sfepius folioso-bracteatis ; invo- 

 lucr'O valde arachnoideo-lanoso subviscoso (rarius glabrato) ; squamis 

 aceroso-attenuatis ; floribus albis. Carduus discolor, var. ^. floribus 

 albis. Hook. Fl. Bor.-Am. 1, p. 302. Cirsitim Hookerianum Nutt. in 

 Trans. Amer. Phil. Soc. I.e. p. 418. — Rocky Mountains, chiefly north 

 of lat. 48°, and in the upper wooded and alpine regions, Drummond, 

 Burke, Bourgeau (herb. Hook.). Nuttall founded Cirsium Hookeri- 

 anum wholly upon a Drummondian specimen (communicated by Sir 

 Wm. Hooker to Schweinitz) of the Carduus discolor var. (3. of the 

 Flora Boreali- Americana. All the other north-western specimens 

 referretl to C. discolor belong to C. undulatus, from which the present 

 species is wholly distinct. Besides the long and cobwebby wool, the 

 long tips of the scales of the involucre generally have some viscid 

 pubescence, and occasionally some coarser many-jointed hairs, ap- 

 proaching those of the following species. 



C. ERiocEPHALUS. Caule 1-2-pedali simplici creberrime folioso ; 

 foliis linearibus multilobatis plerumque longe decurrentibus sjDinosissi- 

 mis ; capitulis j^arvulis in glomerulum foliosum j)rimum nutans arete 

 congestis ; involucro pilis longis multi-articulatis fuscis lanosissimo, 

 squamis arrectis acerosis (basi parva dilatata excepta) ; floribus 

 "luteis" vel luteolis. Cirsium eriocephalum Gray in Proc. Acad. 

 Philad. 1803, p. 69 ; Eaton in Bot. King, p. 196. — High alpine region 

 of the Rocky Mountains in Colorado, Parry, Hall and Harbour, Vasey, 

 Greene, &c. Varies with herbage and involucre glabrate, perhaps 

 passing into var. leiocephalus Eaton, 1. c. ; but "Watson's specimens, 

 from the Uinta Mountains, are insufficiently developed and still very 

 doubtful. The sjaecies is nearly related to the foregoing. 



