CATALOGUE. 179 



reduced to a small lanceolate bract; head 1' in diameter, calyculate scales 

 linear, acute; inner scales (involucre proper) broader, acuminate, and 

 somewhat wavy at apex; achenia somewhat cylindrical. 



Tetradymia canescens, DC, var. inebmis, Gray. — Eastern Arizona, at 

 6,500 feet altitude, Loew; also from Southern Colorado (449, 855). 



Cnicus Drummondii, T. & G, (462) ; and also var. acaulescens, Gray 

 (461). Colorado. 



Cnicus undulatus, Gray (Proc. Amer. Acad, x, 42). — South of Camp 

 Apache, at 5,900 feet (293); and Mount Graham, Arizona, at 9,000 feet 

 (•742). 



Var. megacephalus, Gray (I. c. p. 42). — Head 2-2£' in diameter; 

 involucral scales broader than in the type of the species and spines (of 

 scales) rather shorter. — Camp Apache, Ariz. (256) ; also elsewhere from 

 Arizona and Utah. 



Cnicus Aeizonicus, Gray (Z. c. p. 44). (Cirsium undulatum var., Gray, 

 PL Wright. 2, p. 101.) — My specimen, a very smooth form, may be briefly 

 described thus: — glabrous, 3-4° high, and loosely branched; leaves pin- 

 natifid, with the divisions tipped with long spines ; peduncles short ; scales 

 of involucre longer and comparatively narrower from without inward, the 

 outermost distinctly spine-tipped (the innermost acute, but hardly spine- 

 tipped); " stigmatic tip to the style barely 4-6 times longer than thick and the 

 node at its base manifest." — Central Arizona (289) ; Colorado (463). 



Cnicus Neo-Mexicanus, Gray (I. c. p. 45). (Cirsium Neo-Mexicanum, 

 Gray, PL Wright. 2, p. 101.) — 1-2° high, covered with a dense, soft, white 

 wool (becoming less so with age) ; lower leaves petioled, deeply pinnately 

 parted, the lobes tipped with well-marked spines, with margins between 

 spiny-ciliate; upper leaves sessile, less deeply pinnatifid and smaller, 

 becoming gradually reduced to bracts; heads hemispherical, 1-2' in diam- 

 eter; outer scales of the involucre reflexed, and with tips more strongly 

 spinescent than the inner ones ; corolla somewhat irregularly cleft ; lobes 

 twice as long as the throat ; anthers with a minute spiny tip, longer than 

 each anther is wide. — Santa Fe*, N. Mex. (62). 



Cnicus Parryi, Gray (I. c. p. 47). — Greenish, or even somewhat 

 glaucous, slightly tomentose ; leaves lanceolate, irregularly, deeply dentate, 



