COMPOSITAE. 



[Vol. III. 



7. Senecio Plattensis Nutt. Prairie 

 Ragwort. (Fig. 4039.) 



S. Plattensis Nutt. Trans. Am. Phil. Soc. (II) 7: 413. 

 1 841. 



Perennial, similar to the preceding species, usu- 

 ally smaller-leaved, lower and less tomentose, or 

 becoming glabrate in age, seldom over i}4 high. 

 Basal leaves oval, ovate or oblong, some or all of 

 them more or less pinnatifid, with the terminal 

 segment much larger than the lateral ones, crenu- 

 late or dentate, long-petioled; heads several or 

 numerous, compactly or loosely corymbose, con- 

 spicuously radiate. 



Illinois to South Dakota, Nebraska and the Indian 

 Territory. April-June. 



8. Senecio antennariifolius Britton. 

 Cat's-paw Ragwort. (Fig. 4040.) 



Perennial, tufted in mostly large clumps; stems 

 slender, S'-iS' high, loosely white-woolly. Leaves 

 nearly all basal, commonly numerous, oval to 

 spatulate, angulately few-toothed or entire, mostly 

 obtuse, narrowed into a petiole as long as the blade 

 or longer, densely white-tomentose beneath, green 

 and finally glabrous above, \ f -i%' long; stem-leaves 

 small, spatulate, laciniate, or the upper narrowly 

 linear and entire; heads several, corymbose, slen- 

 der-peduncled, rather less than i / broad; rays 

 golden yellow, showy; involucre 3" high, white- 

 woolly; achenes glandular-pubescent. 



White Sulphur Springs, West Virginia, on a loose 

 slate hillside, T. F. Allen and N. L. Britton, May 16, 

 1897; Blue Ridge, Virginia, S. B. Buckley, 1838. 



9. Senecio obovatus Muhl. Round-leaf Squaw-weed. (Fig. 4041.) 



Senecio obovatus Muhl.; Willd. Sp. PI. 3: 1999. 1S04. 

 Senecio Elliottii T. &. G. Fl. N. A. 2: 443. 1843. 

 S. aureus var. obovatus T. & G. loc. cit. 442. 1843. 



Perennial; stems commonly several from the 

 same root, glabrous, or a little woolly at the base, 

 9'-24 / high. Leaves glabrous, rather thick, the 

 basal ones obovate with a cuneate base, or spatu- 

 late, very obtuse and rounded at the apex, \'-Z x /t r 

 long, yk f -2.' wide, crenate-dentate, often purplish, 

 usually with short margined petioles, or the earli- 

 est sessile; stem-leaves commonly few and sessile, 

 spatulate to oblong, often incised or piunatifid, the 

 uppermost very small; heads several, corymbose, 

 6 // -8 // broad, about 3 // high, slender-peduncled; 

 involucre nearly cylindric, its principal bracts 

 linear-lanceolate, 2 // -3 // long, acute, usually with 

 1-3 small exterior ones; rays 8-12, usually con- 

 spicuous, achenes glabrous; pappus white. 



In moist soil and on banks. Nova Scotia to Florida, 

 west to Ontario, Michigan, Kentuck3 - and Missouri. 

 April-June. 



Senecio obovatus elongatus (Pursh) Britton. 

 Senecio elongatus Pursh, Fl. Am. Sept. 529. 1814. 



Stem slender, weak; leaves, or some of them, with tufts of wool in their axils; heads few, ray- 

 less or short-rayed, often long-peduneled. On moist shaded banks, eastern Pennsylvania. 



