COMPOSITAE. Vor. III. 
3. Senecio viscdsus L. Fetid or Viscous Groundsel. 
Fig. 4612. 
Senecio viscosus L. Sp. Pl. 868. 1753. 
Annual, viscid-pubescent, strong-scented; stem usually 
much branched, 1°-2° high. Leaves 1-2-pinnatifid, 14’-3’ 
long, oblong or somewhat spatulate in outline, the segments 
oblong or cuneate, dentate or incised; lower leaves peti- 
oled; heads few in the corymbs, 3’-4” broad, mostly slen- 
der-peduncled; involucre nearly cylindric, 4-5’ high, its 
bracts linear, acute, with 1-3 shorter outer ones; rays com- 
monly about 20, very short, recurved and inconspicuous; 
achenes glabrous; pappus bright white, about one-third 
longer than the involucre. 
In waste places and on ballast near the coast, Nova Scotia, 
New Brunswick and Quebec to North Carolina. July—Sept. 
4 Senecio glabéllus Poir. Butterweed. Cress-leaved Groundsel. Fig. 4613. 
S. lyratus Michx. Fl. Bor. Am. 2: 120. 1803. Not L. 1753. 
S. glabellus Poir. in Lam, Encycl. 7: 102. 1806, 
Senecio lobatus Pers. Syn. 2: 436. 1807. 
Annual, glabrous throughout, or slightly woolly 
when young, fleshy and tender; stem hollow, sim- 
ple or branched, 1°-3° high. Leaves 2’-10’ long, 
pinnately divided, the segments orbicular, oblong, 
obovate or cuneate, obtuse, sinuate-dentate, entire or 
lobed, the terminal segment usually larger than the 
others; lower and basal leaves slender-petioled; 
heads numerous, 7-10” broad, slender-peduncled 
in terminal corymbs; involucre nearly cylindric, 23” 
high, its bracts linear, acute, usually with no small 
outer ones; rays 6-12; achenes minutely hispidu- 
lous on some of the angles; pappus white, somewhat 
longer than the involucre. 
In swamps, North Carolina to Kentucky, Illinois, Mis- 
souri, Arkansas, Florida, New Mexico and Mexico. 
April-Sept. 
5. Senecio palustris (L.) Hook. Marsh Fleawort. Pale Ragwort. Marsh 
Groundsel. Fig. 4614. 
Cineraria palustris L. Sp. Pl, Ed. 2, 243. 1763. 
Senecio palustris Hook. Fl. Bor. Am. 1: 334. 1833. 
Annual or biennial, pubescent or glabrate; stem 
stout, simple, hollow, 6-24’ high. Leaves lanceo- 
late, oblong or spatulate, entire, dentate, or lacin- 
iate, acute or obtuse, 2’-7’ long, 3’-15” wide, or 
the upper linear-lanceolate and small, those of 
the stem sessile and somewhat auriculate-clasping, 
the basal petioled; heads numerous, 6’—12” broad, 
mostly short-peduncled in a large, rather dense, 
terminal corymb; involucre cylindric, becoming 
campanulate, 3-4” high, its bracts linear, acute, 
more or less pubescent, with no shorter outer 
ones; rays 15-20 or more, pale-yellow; achenes 
glabrous; pappus white, elongated, at length twice 
the length of the involucre. 
In swamps, Iowa and Wisconsin to Manitoba and 
arctic America, west to Alaska. Reported from Lab- 
rador. Also in Greenland, northern Europe and Asia. 
June-Aug. 
