CHAPTALIA. 193 
C. LEUCOCEPHALA. Rootstock 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. LEONINA. Rootstock short, ascending, not chaffy at top : 
leaves not distinctly lyrate, in outline obovate-oblong, obtuse, 
coarsely retrorse-crenate-lobed, obscurely denticulate, 2 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. PETROPHILA. Rootstock 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. 
Rocky hills near Guadalaxara, Mexico, 22 July, 1902, C. G. 
Pringle, n. 11315, as in U. S. Herb. 
C. MONTICOLA. Rather slender and tall species of subalpine 
woods, with no proper rootstock and fleshy-fibrous roots : leaves 
