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SENECIO COMPOSIT& 375 
ked at base: the scales thin-herbaceous, lanceolate or linear, 
equal, in one or two series. . Receptacle flat, naked. Rays elon- 
gated: disk-corollas with distinct and usually elongated tube and 
funnelform or cylindraceous 5-lobed limb. Style-appendages 
obtuse, pubescent. Achenes linear, 5-angled or 5-10-ribbed, 
somewhat hirsute or nearly glabrous. Pappus asingle series of 
rather rigid strongly scabrous or barbellate capillary bristles. 
§ 1 Ours perennials with tomentose and usually floccose pu- 
bescence or none, never viscid nor obviously hirsute. 
* Heads more than half-inch high, very many-flowered: disk 
corollas merely 5-toothed : heads radiate. 
S. megacephalus Nutt. Trans. Am. Phil. Soc. vii, 410. About a foot 
high, loosely floccose-woolly, tardi'y glabrate, leafy: leaves entire, lanceo- 
late and tapering into a petiole, uppermost cauline attenuate, thickish: 
heads 1-3, short-peduncled, 8-12 lines high: involucre calyculate by some 
very loose and setaceous-subulate elongated accessory bracts: rays over 
half inch long. Mountains of Idaho. 
* * Heads middle-sized or small, erect, mostly radiate. 
+ Stems herbaceous, numerously and equally leafy to the top: 
leaves pinnately veined,not conspicuously reticulate, from entire to 
laciniate-dentate or.dissected, not narrowly linear,glabrous or very 
early glabrate and smooth. — 
++ Low, alpine: heads few or solitary. 
S. hesperis Greene. Pitt. ii, 166. Stems, 4-10 inches high from short, 
spreading rootstocks, leafy only at the decumbent base; sparingly floccose- 
tomentose when young, in age nearly glabrous: leaves thickish and some-. 
what fleshy, from round-oval te oblong and oblong-lanceolate, 6-12 lines 
long, tapering or abruptly contracted to a short or long petiole, almost en- 
tire or repandly or crenately few-toothed: head solitary half-inch high, 
with the expanded rays 1 inch broad: involucre campanulate, the bracts - 
linear, outer calyculate ones few or none: rays 10-12 deep yellow, style tips 
slightly penicillate. On the serpentine formation of the Coast range of 
southern Oregon. 
S. Fremontii T. & G. Fl. ii, 445. Many-stemmed from a thickish cau- 
dex, 6-12 inches high, leafy to the top: leaves thickish, from rounded-ob- 
ovate or spatulate to oblong, obtuse, obtusely or acutely dentate, some- 
times even pinnatifid-dentate; lower abruptly contracted into a winged - 
petio'e ; uppermost sessile by a broadish base: head half-inch high, short- 
peduncled, subtended by a few short loose bractlets: rays 3-5 lines long. 
Alpine regions of the Rocky Mountains to Lassen Peak California and 
the Blue Mountains of Oregon. 
S. occidentalis Greene Pitt. iv,122. 8. Fremontii Var occidentalis 
Gray. Stems many from running rootstocks, 4-12 inches high, rather 
slender: leaves from round-obovate to spatulate, 6-12 lines long those in 
the middle of the stem largest and the lowest smallest, coarsely dentate: 
heads 1-several, about 6 lines high: bracts of the involucre linear, 1- 
nerved, scarious-margined, the small accessary ones setaceous to lanceo- 
late, rays 4-6 lines long. On the higher mountains, Oregon to California 
_ and the Rocky mountains. 
S. streptanthifolius Greene Eryth. iii, 28. ‘‘Only a foot high, or even 
less, from clustered leafy perennial rootstocks, glabrous throughout, some- 
what fleshy-coriaceous and glaucous: leaves.1 to 1 ¥ inches long, orbicular 
