COMPOSITAE. 
19. 1893. 
pappus white. 
Sept. 
16. Senecio atreus L. Golden Ragwort. 
Life-root. Swamp Squaw-weed. 
Fig. 4625. 
Senecio aureus L. Sp. Pl. 870. 1753. 
Senecio pauciflorus Pursh, Fl. Am. Sept. 529. 1814. 
Senecio gracilis Pursh, Fl. Am. Sept. 529. 1814. 
Perennial, glabrous or very nearly so through- 
out; stems rather slender, solitary or tufted, 
6’-24° high. Basal, leaves cordate-ovate or 
cordate-orbicular or reniform, crenate-dentate, 
very obtuse and rounded, often purplish, 1-6 
long, with long slender petioles; lower stem 
leaves lanceolate or oblong, usually laciniate, 
pinnatifid or lyrate, the uppermost small, ses- 
sile, somewhat auriculate and clasping; heads 
usually several, 8-10” broad, 4-5” high, slen- 
der-peduncled in an open corymb; rays 8-12, 
golden-yellow; achenes glabrous; pappus white. 
In swamps and wet meadows, Newfoundland to 
Florida, Ontario, Michigan, Missouri and Texas. 
Grundy-swallow. False-valerian. Root strong- 
scented. Races differ in size of plant, size of 
leaves and number of heads. May-July. 
333. 1833. 
3: 479. 1898. 
“zg. Senecio Robbinsii Oakes. Robbins’ 
Squaw-weed. Fig. 4624. 
Senecio Robbinsii Oakes; Rusby, Bull. Torr. Club 20: 
Perennial, glabrous or very nearly so through- 
out; stems slender, 1°-23° high. Basal leaves 
long-petioled, lanceolate, obtuse or acute at the 
apex, cordate, subcordate or truncate at the base, 
usually thin, 2-4’ long, 4’-13’ wide, sharply den- 
tate; stem leaves mostly pinnatifid or lobed, at 
least below the middle; heads several or numer- 
ous, slender-peduncled in an open corymb, 8’—10” 
broad; rays 6-12; achenes glabrous or pubescent; 
In swamps and mountain meadows, Nova Scotia to 
New Hampshire, Vermont and New York. June- 
Senecio pseudatireus Rydb. (S. semi-cordatus Mac- 
kenzie & Bush), of the Rocky Mountain region, differing 
by elliptic or broadly oblong basal leaves, ranges east- 
ward into North Dakota and Missouri. 
17. Senecio discdideus (Hook) Britton. 
Northern Squaw-weed. Fig. 4626. 
Senecio aureus var. discoideus Hook. Fl. Bor. Am. 1: 
Senecio discoideus Britton, in Britt. & Brown, Ill. Fl. 
Perennial, glabrous except for small tufts of wool 
in the axils of the lower leaves; stem rather stout, 
1°-23° 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; principal bracts of the invo- 
lucre narrowly linear, 3-5” long, the short outer 
ones few or none; rays none; achenes glabrous. 
In moist places, Labrador to Yukon, Quebec, Michi- 
gan, Wyoming and British Columbia. June-Aug. 
