CHAPTALIA. 193 



G. LEUCOCEPHALA. Eootstock none, the crown of the root 

 deep-seated, the petioles of the many leaves therefore partly 

 hypogeous and blanched : leaves 3 or 4 inches long, somewhat 

 lyrately sinuate and narrowed below the ovate acute terminal 

 lobe, the whole margin remotely denticulate, texture thin, upper 

 face glabrous, lower merely pale with some traces of a thin 

 arachnoid tomentum : scapes 3 or 4, stout, 7 to 10 inches high, 

 flocculent, filiform-bracted ; bracts of involucre lance-linear, 

 white with a loose tomentum : achenes finely appressed-pubes- 

 cent, the beak short. 



Foothills of the Sierra Madre, Chihuahua, Sept. 1887, C. G. 

 Pringle, n. 1312 as in U. S. Herb, named C. Seemannii, but the 

 foliage makes no approach to that attributed to Seemann's plant. 



C. LEOKiNA. Eootstock short, ascending, not chaffy at top : 

 leaves not distinctly lyrate, in outline obovate-oblong, obtuse, 

 coarsely retrorse-crenate-lobed, obscurely denticulate, 3 or 3 

 inches long, thin, thinly arachnoid above, beneath densely white- 

 tomentose : heads large, on short naked scapes of only 3 inches : 

 bracts of the involucre broad and much imbricated, tomentose 

 except as to the purple margins and tips, the latter pungently 

 acute : achenes crystalline-granular, tapering to a beak of their 

 own length. 



Strongly marked species from either Coahuila or Nuevo Leon, 

 Mexico, by Edw. Palmer, in 1880, n 764 as in U. S. Herb., in 

 aspect more like the Texan C. carduacea than any other. 



C. PETEOPHiLA. Eootstock an inch long, ascending, the 

 roots slightly fusiform, leaves upright, 5 or 6 inches long, oblong- 

 lanceolate, cuspidately acute, obscurely denticulate, in no degree 

 lyrate but the base of some leaves lightly sinuate, all very thin, 

 glabrate above, beneath thinly hoary-tomentose : scape solitary, 

 naked, a foot high or more : bracts of involucre subulate to 

 linear-lanceolate, floccose-tomentose except at the pungent tip. 



Eocky hills near Guadalaxara, Mexico, 23 July, 1902, C. G. 

 Pringle, n. 11815, as in IT. S. Herb. 



C. MONTICOLA. Eather slender and tall species of subalpine 

 woods, with no proper rootstock aad fleshy-fibrous roots : leaves 



