40 PROCEEDINGS OF THE AMERICAN ACADEMY 



C. PUJiiLUS Torr. Cirsium pumilum Spreng., Torr. & Gray, 1. c. 

 cum syn. Capitulo maximo ssepe niulo ; involucri squamis exterioribus 

 latiusculis spinula brevi armatis, intimis appendice parva scariosa erosa 

 quandoque superatis. 



C. HORRiDULUS Pursh. Cirsium horrididum Miehx., Torr. «fc 

 Gray, 1. c. cum syn. Capitulis singulis involucro exterior! bractearum 

 spiuosissimarum cinctis ; squamis involucri proprii attenuati's innocuis. 



-)- +- -I— Boreali-occiden tales ; involucri squamis intimis nonnullis apice 

 jjl. m. scarioso-appeudiculatis modo C humilis. 



C. FOLiosus. Carduus foliosus Hook. Fl. Cirsium foUosum DC. 

 Araneoso-lanatus et longe villosus, demum glabrescens ; caule valido 

 subpedali crebre folioso ; capitulis sessilibus majusculis inter folia glo- 

 meratis bracteisque spinosissimis stipatis ; involucro et corollis fere O. 

 Drummondii ; foliis elongatis suberectis spinoso-dentatis vel pinnati- 

 fidis. — Prairies of the northern Rocky Mountains, Drummond (a less 

 prickly form), Burke (in herb. Hook.) : high pine country in the 

 interior of Oregon, Spalding. Intermediate in appearance and char- 

 acter between G. Drummondii and C. eriocephalus, but near the 

 former. Involucre broad, an inch liigh, glabrate, at first with some 

 fine cobwebby wool, but no jointed hairs ; the outer scales broadish, 

 successively shorter, appressed, rather abruptly tipped with a short and 

 weak prickle. 



C. Drummondii. Cirsium Drummondii Torr. & Gray, FI. cum 

 syn. Planta typica tripollicaris ad tripedalem ! Capitulis solitariis 

 vel subplurimis magnis ; involucri squamis exterioribus oblongo-lance- 

 olatis sensim in cuspidem vel spinulam fere innocuam acuminatis, 

 intimis fere linearibus siBpissime appendicula scariosa superatis ; corol- 

 lis sesquipollicai-ibus (tubo proprio tenui pollicari), lobis fauce brevi- 

 oribus ; foliis subpinnatifidis. — From Mackenzie River near the arctic 

 circle to the Colorado Rocky Mountains and Oregon. In British 

 Columbia Dr. Lyall collected specimens fully four feet high. 



Var. ACAULESCENS, capitulis inter folia radicalia sessilibus aut 

 paullo aut dimidio minoribus, corollis nunc parum pollicaribus. Cir- 

 sium acaule var. Americamim Gray in Proc. Acad. Philad. 1863, 

 p. G8. C. Drummondii var. Eaton in Bot. King, p. 195. — Rocky 

 Mountains, and sparingly in the Sierra Nevada of California. 



C. QUERCETORUJi. Lcviter araneosus, glabrescens ; caule subpedali 

 ramoso oligocephalo ; foliis sub-bipinnatifidis vel pinnatipartitis lobis 

 grgpe 2-5-fidis ; involucri squamis crasso-coriaceis, exterioribus ovali- 

 oblougis ad lanceolatas mucrone vel spinula rigida apiculatis, intimis 



