GENUS 102. 
6. Senecio spartioides T. & G. Broom-like 
Senecio. Fig. 4615. 
Senecio spartioides T.& G. Fl. N. A. 2: 438. 1843. 
Woody at the base, usually branched, sometimes 
shrubby, glabrous or nearly so, leafy, 1°-6° high. 
Leaves sessile, or the lowest petioled, 1-3’ long, 
linear, entire, or more or less serrate, not lobed; 
heads corymbose at the ends of the branches, 3’-1’ 
broad, slender-peduncled; involucre cylindric or 
becoming campanulate, 4-5” high, its bracts 
linear, acute or acuminate, usually with some ) 
subulate exterior ones; rays 8-15; achenes ca- 
nescent; pappus bright white. 
Plains, in dry soil, Nebraska to Texas, Wyoming 
and Arizona. June-Sept. This and the following 
species were included in the description of the far 
western S. Douglasii DC. in our first edition. 
"iG 
THISTLE FAMILY. 
541 
Ww 7 
Wwce Lf 
Warn f 
7. Senecio Riddellii T. & G. Riddell’s 
Senecio. Fig. 4616. 
S. Riddellii T. & G. Fl. N. A. 2: 444. 1843. 
S. Fremontii (T. & G.) Rydb.; Britton, Manual 1028. 
1901. Not S. Fremontii T. & G. 
Woody at the base, usually branched, some- 
times shrubby, glabrous or nearly so, leafy, 1°-6° 
high. Leaves sessile, or the lowest petioled, thick, 
14’-33’ long, pinnately parted into 3-9 linear or 
filiform, entire segments, or the upper entire; 
heads corymbose at the ends of the branches, 
5-10” broad, slender-peduncled; involucre cylin- 
dric or becoming campanulate, 5’-8” high, its 
bracts linear, acute or acuminate, usually with 
some subulate exterior ones; rays 8-15; achenes 
canescent; pappus white. 
Plains, in dry soil, Nebraska to Texas and Mexico. 
June—-Sept. 
(1 
8. Senecio Psetido-Arnica Less. Sea-beach 
Senecio. Fig. 4617. 
Arnica maritima L, Sp. Pl. 884. 1753. Not S. mari- 
timus L. 
Senecio Pseudo-Arnica Less. Linnaea 6: 240. 1831. 
Perennial, somewhat fleshy; stem stout, mostly 
simple, very leafy, 6’-3° high. Leaves oblong-obo- 
vate, lanceolate, or the lower spatulate, acute or 
obtuse at the apex, 4’-8’ long, 4’-2’ wide, densely 
tomentose beneath, at least when young, repand- 
dentate or denticulate, narrowed to a sessile and 
partly clasping base, or the lowest into margined 
petioles; heads solitary, or several (2-7) and co- 
rymbose, stout-peduncled, 14’-2’ broad, 8-10” 
high; involucre broadly campanulate, its bracts 
lanceolate, acuminate, mostly tomentose, common- 
ly with several subulate spreading ones at the base; 
rays 12-25, linear, 3-toothed, conspicuous; disk- 
corollas 5-lobed; achenes glabrous; pappus dull. 
‘On sea-beaches and rocks near the sea, Maine, New 
Brunswick and the lower St. Lawrence to Labrador 
and the Arctic Sea. Also in Alaska. July—Aug. 
