CARDUACEAE. 335 



TRIBE 9. CYNAREAE. 

 One genus. 88. CARDUUS. 



Tribe i. VERNONIAE. 



i. VERNONIA Schreb. IRON WEED. 



i. Vernonia Jamesii T. & G. (V. marginata (Torr.) Britton) On plains 

 from Neb. and Colo, to Ark. and Tex. " On the Arkansas." 



Tribe 2. EUPATORIAE. 



2. EUPATORIUM L. JOE-PYE WEED, THOROUGH-WORT. 



Leaves verticillate in whorls of threes. 



Leaves ovate, acute. i. E. maculatum. 



Leaves lanceolate, acuminate. 2. E. Bruneri. 



Leaves opposite. 3. E. texense. 



1. Eupatorium maculatum L. In moist soil from N. Y. and B. C. to Ky. 

 and N. M. Along river east of Ft. Collins. 



2. Eupatorium Bruneri A. Gray. (Eupatorium Rydbergii Britton) In 

 moist soil from Iowa, Sask. and B. C. to Colo, and Utah. Alt 4000-5000 ft. 

 Canon City ; Ft. Collins ; La Potidre near La Porte. 



3. Eupatorium texense (T. & G.) Rydb. (E. ageratifolium texense T. & 

 G. ; E. ageratifolium A. Gray, mainly; not DC.) Rocky hills from Colo, to 

 Tex. and Ariz. Alt. 7000-8500 ft. Canon City; Box Canon, west of Ouray; 

 Trail Glen. 



3. KUHNIA L. 



Leaves oblong or lanceolate, 3-ribbed, more or less toothed. 



Bracts narrowly linear, acuminate. i. K. Hitchcockii, 



Bracts linear, abruptly acute. 2. K. glutinosa. 



Leaves linear, i -ribbed, entire. 3. K. Goodingii. 



1. Kuhnia Hitchcockii A. Nelson. Plains of Kans. and Colo. Alt. 4000- 

 5000 ft. Denver. 



2. Kuhnia glutinosa Ell. (K. eupatorioides corymbulosa T. & G.) On dry 

 prairies and plains from Ills, and Mont, to Ky. and Colo. Alt. about 5000 

 ft. Boulder; New Windsor; Ft. Collins; Spring Canon. 



3. Kuhnia Goodingii A. Nels. On rocky hills and plains from Colo, to 

 Tex. and Ariz. Alt. 4000-7000 ft. Engelmann Canon ; Granite ; Manitou ; 

 Durango; Hotchkiss; Pagosa Spring. 



4. COLEOSANTHUS Cass. 



Leaf-blades ovate or deltoid. 



Leaves slender-petioled, not spinulose-toothed ; bracts thin, 2 mm. or less wide. 

 Heads 30-so-flowered. 



Leaves thin, minutely puberulent ; teeth usually broadly triangular, acute ; 



peduncles usually longer than the heads. i. C. grandiflorus. 



Leaves thick, densely scabrous-pubescent, very veiny; teeth rounded-ovate, 

 obtuse or mucronate ; peduncles shorter than the subumbellate heads. 



2. C. umbellatus. 

 Heads io-25-flowered. 



