COMPOSITAE. 



[Vol. III. 



7. Senecio Plattensis Nutt. Prairie 

 Ragwort. (Fig. 4039.) 



5. Plallensis Nutt. Trans. Am. Phil, Soc. fll) 7: 413. 



1841. 



Perennial, similar to the preceding species, usu- 

 ally smaller-leaved, lower and less tomentose, or 

 becoming glabrate in age, seldom over I'i" bigh. 

 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- 

 lale 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. 



(Fig. 4041.) 



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-tomeutose beneath, green 

 and finally glabrous above, i'-2>^' long; stem-leaves 

 small, spatulate, laciniate, or the upper narrowly 

 linear and entire; heads several, corymbose, sleu- 

 der-peduncled, rather less than 1' 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. 



Senecio obovatus Muhl. Round-leaf Squaw-weed. 



Senecio obovatusltlnhl.; Willd. Sp. PI. 3: 1999, 1S04. 

 Senecio ElIio/liiT. &, G. Fl. N. A. 2: 443, 1S43. 

 5. aureus var. obovalus 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, ver3' obtuse aud rounded at the apex, I'-j'/i' 

 loug, y-''-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 pisnatifid, the 

 uppermost very small; heads several, corymbose, 

 6"-S" broad, about 3" high, slender-peduncled; 

 involucre nearly cylindric, its principal bracts 

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

 1-3 small exterior cues; rays S-12, usually con- 

 spicuous, achenes glabrous; pappus white. 



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

 west to Ontario, Michigan, Kentucky and Missouri. 

 April-June. 



Senecio obovatus elongatus ( Pursh ) Britton. 

 Senecio elongatus Pursh, Fl. Am. Sept. 5215, 1S14, 



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

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



