GENUS I02, THISTLE FAMILY. 545 
18. Senecio obovatus Muhl. Round-leaf 
Squaw-weed. Fig. 4627. 
Senecio obovatus Muhl.; Willd. Sp. Pl. 3: 1999. 1804. 
Senecio Elliottii T.& G. Fl. N. A.2: 443. 1843. 
S. aureus var. obovatus T. & G. loc. cit. 442. 1843. 
S. rotundus (Britton) Small, Fl. SE. U.S. 1304. 1903. 
Perennial; stems glabrous, or a little woolly at 
the base, 9-24’ high. Leaves glabrous, rather thick, 
the basal ones obovate with a cuneate base, subor- 
bicular or broadly spatulate, very obtuse and round- 
ed at the apex, 17-34’ long, 2’-2’ wide, crenate- 
dentate, often purplish; stem leaves commonly few 
and sessile, spatulate to oblong, often incised or 
pinnatifid; 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; 
tays 8-12, usually conspicuous, sometimes fewer 
and short; achenes glabrous; pappus white. 
In moist soil on banks and in woods, Maine and Ver- 
mont to Florida, Ohio, Michigan, Alabama and Texas. 
Races differ in size, leaf-form, number and size or rays. 
Apparently erroneously recorded from Nova Scotia and 
Ontario. April-June. 
1g. Senecio Crawfordii Britton. Crawford’s 
Squaw-weed. Fig. 4628. 
Senecio Crawfordii Britton, Torreya 1: 21. 1901. 
S. Balsamitae var. Crawfordi Greenman, Rhodora 10: 69. 
1908. 
Perennial, glabrous, or with sparse woolly pubescence 
below; stem slender, about 16’ high. Leaves thick, firm, 
the basal ones erect, the larger 8’-10’ long, the 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; stem leaves lanceolate or narrower, 
mostly acuminate, incised-serrate, clasping, the upper 
sessile, the lower petioled, the uppermost very small; 
heads 3-7; peduncles slender, bracted, rarely forked; 
involucre 4” high, its bracts linear-lanceolate, acumi- 
nate, shorter than the white barbellate pappus; rays 
4’-5”" long; achenes linear, striate. 
Wet meadows, southeastern Pennsylvania. May-June. 
20. Senecio pauperculus Michx. Balsam 
Groundsel. Fig. 4629. 
Senecio pauperculus Michx. Fl. Bor. Am. 2: 120. 
1803. 
Soeae Balsamitae Muhl.; Willd. Sp. Pl. 1999. 1804. 
Senecio aureus var. Balsamitae T. & G. Fl. N. A. 2: 
442. 1843. ett. 
Perennial, often tufted; stems slender, 14’-20 
high, woolly at the base and in the axils of the 
lower leaves, or essentially glabrous. Basal leaves 
slender-petioled, oblong, rarely slightly spatulate, 
very obtuse, narrowed at the base, mostly thick, 
crenate, or rarely dentate, often purplish, 1’-5’ 
long, 3’-6” 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-pedun- 
cled, 6-10” broad; involucre about 3” high; rays 
8-12; achenes hispidulous or glabrous; pappus 
white. 
In dry or rocky soil, Newfoundland to North Caro- 
lina, Ontario, British Columbia, Alabama, Tennessee 
and Nebraska. May-July. 
35 
