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. 0. Neally, 1891, 

 n. 323, as in U. S. Herb. 



C. PoTOSiNA. Thin foliage, fleshy-fibrous roots and obsolete 

 rootstock all as in the foregoing, as to texture, but plant smaller: 

 leaves perfectly glabrous above, very lightly fiocculent 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. S. 

 Herb. 



C. HOLOLEUCA. Small leaves and scapes from a subligneous 

 upright rootstock fibrous-chaffy with the remains of the leaves 

 of former seasons: leaves I to II 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 i 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 fiocculent 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. 



