106 PITTONIA. 
denticulate, those of the stem smaller and gradually dimin- 
ished in size toward the inflorescence: bracts of the narrow 
involuere only 8 or 10, firm, obloug, obtuse, either wholly 
black or the inner ones with blackened midvein and tip; 
rays few or none; disk-corollas salmon-color: achenes green- 
ish, glabrous; pappus firm, persistent. 
Plentiful towards timber-line in the Rocky Mountains of 
Colorado, Utah, &e.; supposed by some to be a variety of the 
obscure far-northern S. lugens, and forming a part of S. lugens 
. var. foliosus of Gray's Synoptical Flora. 
SENECIO SPHJEROCEPHALUS. Stems several, stoutish, 2 or 
"d feet high, nearly naked above, ending in a simple subum- 
bellate eyme of broad heads, these after flowering closed and 
subglobose; herbage hoary-flocculent even in age: radical 
leaves with broadly oblanceolate acute denticulate blade 
and a long petiole, those of the stem scattered and small: 
bracts of the broad involuere 20 to 30, thin, linear, wholly 
green; rays conspicuous, pale yellow : achenes very small, 
dark brown, hispidulous on the angles with white hairs; 
pappus very fine, deciduous. 
Common in wet meadows of the Humboldt River and 
elsewhere in the Great Basin, and, like the preceding, con- 
fused with S. lugens, but inore closely allied to S. Toluccanus 
of Mexico and the southern Rocky Mountains. 
SENECIO TRIGONOPHYLLUS. Glabrous perennial, with clus- 
tered upright very leafy stems 2 to 4 feet high: leaves mem- 
branaceous and deep-green, from hastate-ovate to deltoid 
and triangular-lanceolate, usually sinuate-toothed or dentic- 
ulate, rarely more incisely and deeply toothed, the blade 
2 to 4 inches long, the petiole an inch or less: heads small 
and numerous in an ample compound cyme: involucres 
campanulate, only 2 or 3 lines high, the bracts 10 or 12, 
oblong-linear, abruptly acute: dchenes greenish, glabrous, 
linear, obscurely and obtusely angled; pappus very fine, 
deciduous. ; 
