COMPOSITAE. 1027 



8. Senecio antennariifolius Britton. Cat's-paw Ragwort. (I. F. f. 4040.) 

 Perennial, tufted in mostly large clumps; stems slender, 2-4.5 dm. high- loosely 

 ■white-woolly. Leaves nearly all basal, commonly numerous, oval to spatulate, 

 angulatelv 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, 2-4 cm. long; stem-leaves small, spatulate, laciniate, or the upper nar- 

 rowly linear and entire; heads slender-peduncled, rather less than 25 mm, broad; 

 ravs golden yellow, showy; involucre 6 mm. high, white- woolly; achenes glandu- 

 lar-pubescent. White Sulphur Springs, \V. Va., on a loose slate hillside; Blue 

 Ridge, Va. , 



9. Senecio obovatus Muhl. Round-leaf Squaw-weed. (I. F. f. 4041.) 

 Perennial; stems commonly several from the same root, glabrous, or a little woolly 

 at the base, 2-6 dm. high. Leaves rather thick, the basal ones very obtuse and 

 rounded at the apex, 2-7 cm. long, 1-2.5 mm - wide, often purplish; usually with 

 short, margined petioles, or the earliest sessile; stem-leaves commonly few and ses- 

 sile, spatulate to oblong, often incised or pinnatifid; headr several, corymbose, 

 12-16 mm. broad, about 6 mm. high, slender-peduncled; inv 'ucre nearly cylin- 

 dric, its principal bracts linear-lanceolate, 4-6 mm. long, acute; rays 8-12, usually 

 conspicuous. In moist soil and on banks, N. S. to Fla., west to Ont., Mich., Ky, 

 and Mo. April-June. 



Senecio obovatus elongatus (Pursh) Britton. Stem slender, weak ; leaves, or some of 

 them, with tufts of wool in their axils ; heads few, rayless or short-rayed, often long- 

 peduncled. On moist shaded banks, eastern Penn. 



Senecio obovatus rotiindus Britton. Basal leaves orbicular, broadly oval, or ovate- 

 orbicular, rather abruptly narrowed into the petiole, the larger 6-7 cm. broad. On wet 

 banks, or rocks, Ky. to Mo. and the Ind. Terr, 



10. Senecio discoideus (Hook) Britton. Northern Squaw- weed. (I. F. 

 f. 4042.) Perennial, glabrous except for small tufts of wool in the axils of the 

 lower leaves; stem rather stout, 3-6 dm. tall; basal leaves oval to ovate, obtuse, 

 thin, sharply dentate, abruptly narrowed into petioles longer than the blade; stem- 

 leaves few, small, more or less laciniate; heads few or several, slender-peduncled, 

 corymbose; bracts of the involucre narrowly linear, 6-10 mm. long; rays usually 

 very short, or none. In moist places, Mich, to the N. W. Terr, and Alaska. 

 June-Aug. 



11. Senecio Crawfordii Britton. Crawford's Squaw-weed. Perennial, 

 with slender thread-like roots, glabrous, or with sparse woolly pubescence below. 

 Stem slender, about 4 dm. high; leaves thick, firm, the basal ones erect, the larger 

 2-2.5 dm. hong, tn e blades oval, oblong, or some of them narrowly obovate, mostly 

 not more than one-half as long as the slender petioles, sharply and nearly equally 

 serrate from the apex to the entire cuneate base, or the lower teeth somewhat 

 larger than the upper; stem-leaves lanceolate or narrower, mostly acuminate, 

 incised-serrate, clasping, the upper sessile, the lower petioled, the uppermost very 

 small; heads 3-7; peduncles 1.5-10 cm. long, slender, bracted, rarely forked; 

 involucre 7-9 mm. high, its bracts linear-lanceolate, acuminate, I— 1.5 mm. wide, 

 shorter than the white barbellate pappus; rays 8-10 mm. long; achenes 

 linear, striate, 2.5 mm. long, 0.5 mm. thick. Tullytown, Pa. 



12. Senecio Balsamitae Muhl. Balsam Groundsel. (I. F. f. 4043.) 

 Perennial, often tufted; stems slender, 2.5-5 dm. high, woolly at the base and in 

 the axils of the lower leaves. Basal leaves slender-petioled, very obtuse, nar- 

 rowed at the base, mostly thick, crenate, often purplish, 3-7 cm. long, 6-12 mm. 

 wide, their petioles and sometimes their lower surfaces persistently tomentose or 

 woolly, or glabrous throughout; lower stem-leaves petioled, laciniate or pinnatifid, 

 the upper sessile, very small; heads few or several, slender-peduncled, 12-20 mm. 

 broad; rays 8-12. In dry or rocky soil, N. S. to N. Car., west to Wash., Br. 

 Col., Tex. and Neb. May-July. 



Senecio Balsamitae paup<?rculus (Michx.) Fernald. Lower; heads few, sometimes 

 only one. Me. to Lab. Apparently merely a reduced form of the type. 



Senecio Balsamitae praelongus Greenman. Tall; lower leaves long-petioled, 1.5-6 

 cm. long, 10-12 mm. broad; stem-leaves large, sometimes 2 cm. wide, deeply pinnatifid 

 with usually rounded lobes; achenes hispidulous. Vt. and Mont, to N'. Y. and Penn. 



