192 LEAFLETS. 
salient mucro-like teeth : scapes with a few filiform bracts, and 
gradually thickened under the head, this 1 inch high, its bracts 
long, narrow, thinnish, tomentose : achenes not seen. 
Rincon Mountains, Arizona, at 7500 feet, G. C. Neally, 1891, 
n. 223, as in U. S. Herb. 
C. Potostna. Thin foliage, fleshy-fibrous roots and obsolete 
rootstock all asin the foregoing, as to texture, but plant smaller: 
leaves perfectly glabrous above, very lightly flocculent beneath, 
scarcely lyrate, but with broad blades lightly and rather evenly 
sinuate-lobed, the lobes with or without a tooth: scapes dilated 
above under the immature heads, and bracted. 
San Luis Potosi, Mexico, Parry & Palmer, n. 544, as in U. 8. 
Herb. 
C. HOLOLEUCA. Small leaves and scapes from a subligneous 
upright rootstock fibrous-chaffy with the remains of the leaves 
of former seasons: leaves ł to 1} inches long, scarcely lyrate, 
usually with one pair of small lobes at base of the body of the 
blade, this oblong-oval, acute, runcinate-toothed, the whole leaf 
of firm texture and thickish, densely white-tomentose beneath, 
less densely and more loosely so above, as well as perhaps less 
permanently : scapes rigid, naked, 2 or 3 inches high: involu- 
cre 3 inch high; bracts oblong-linear, white-tomentose except 
at the rigid purple tip. 
Near Saltillo, Mexico, May, 1898, Edw. Palmer, n. 192 as in 
U. S. Herb. 
C. PRINGLEI. Larger than the last, the subligneous root” 
stocks horizontal and only thin-chaffy : leaves numerous, firm, 
very densely and compactly white-tomentose beneath, the thin 
coat on the upper face flocculent and more or less promptly 
deciduous, the leaf-outline obovate-oblong, very shallowly sinu- 
ate-lobed, not lyrate, the rather many small retrorse teeth seldom 
manifest: scapes solitary, 8 or 10 inches high, rigid, nearly 
bractless, not dilated under the involucre, this of many very 
narrow floccose bracts : achenes with beak or stipe as long as the 
body. 
Cafion above Domingillo, Oaxaca, Mexico, C. G. Pringle, Nov. 
1894, n. 5796 as in U. S. Herb. 
