Senecio. COMPOSITiE. 439 



Plains of the Platte, near the Rocky Mountains, Nuttall ! — Plant 6-8 

 inches high. Heads very many-flowered, nearly an inch long. 



10. iS. lugens (Richards.) : clothed with deciduous tomentose hairs, or 

 nearly glabrous ; stem simple, slender; leaves glandular-toothed, or often 

 nearly entire, obscurely veined; the radical oblong-spatulate, tapering into 

 short petioles; the cauline lanceolate and acute, partly clasping; corymb 

 simple; involucre sparingly calyculaie ; the scales linear-lanceolate, acute, 

 strikingly blackish -purple or sphacelate above the middle; rays about 12, 

 oblong-linear, twice the length of the involucre ; achenia glabrous. — 

 Richards, appx. Frankl. journ. ed. 2. p. 31 ; Spreng. syst. 2. p. 558 ; 

 Hook..' jl. Bor.-Am. 1. p. 332 ,• DC. I. c. S. Kalmii, Hook. 8f Arn. ! hot. 

 Beechey, p. 126 (a stouter form). 



Arctic America from Fort Franklin to the sea-coast, Richardson! and 

 Kotzebue's Sound ! — A foot high. Heads large ; the calyculate bracteoles 

 linear-subulate. 



11. S. exaltatus (Nutt.) : sparsely clothed with caducous villous hairs, at 

 length glabrous ; stem tall and robust, grooved, simple, naked above ; leaves 

 unequally crenate-denticulate (the teeth somewhat glandular), veiny ; the 

 radical and lower cauline broadly lanceolate-oblong, obtuse, on long petioles; 

 the upper lanceolate, acute, partly clasping (sometimes deeply serrate, 

 Nutt.) ; corymb compound, fastigiate, of very numerous (small) heads ; in- 

 volucre scarcely calyculate; the scales linear, with pubescent and slightly 

 sphacelate or purplish tips ; rays 6-8, oblong, short ; achenia glabrous. — 

 Nutt. ! in trans. Amer. phil. soc. {n. ser.) 7. p. 410. S. lugens, Nutt. in 

 jour. Acad. Philad. 7. p. 31 ; not of Richards. 



Plains of the Oregon and of the Platte, Nuttall ! &c. — Stem 3-5 feet high; 

 the umbelliform corymb containing numerous heads, which are smaller 

 than those of S. lugens. 



12. S. cordatus (Nutt.): more or less hairy, especially towards the base 

 of the tall and stout sulcate-angled stem ; lower leaves cordate-ovate, repand- 

 ly serrulate or nearly entire, obtuse, on long petioles ; the upper lanceolate, 

 clasping, serrate ; heads numerous, in a nearly simple corymb ; scales of the 

 campanulate involucre (about 15) linear, with dark and sphacelous pubes- 

 cent tips ; rays 5 or 6, oblong; achenia glabrous. — Nutt. in trans. Amer. 

 phil. soc. I. c. p>. AW. 



Alluvial situations in Oregon, uear the mouth of the Wahlamet. Nuttall. 

 June. — Plant 2-3 feet high, evidently allied to the preceding species. 



13. S. fastigiatus (Nutt.): sparingly arachnoid-tomentose when young; 

 stem slender, at length glabrous, simple, angled ; leaves lanceolate or linear- 

 lanceolate, mostly obtuse and entire, tapering into petioles, tomentose-canes- 

 cent, or at length nearly glabrous ; the upper cauline linear, small, subses- 

 sile ; heads (small) numerous, in a fastigiate (simple or compound) corymb ; 

 involucre scarcely calyculate; the scales (yellowish) linear-lanceolate; rays 

 about 8, linear-oblong; achenia glabrous. — Nutt. in trans. Amer. j)hil. soc. 

 I. c. p. 410. 



Plains of the Oregon, near the Wahlamet, Nuttall ! — Stem 2 or 3 feet 

 high. Leaves rather thick and rigid, the lower a span long (with the peti- 

 oles), sometimes sparingly serrulate towards the apex, the margins inclined 

 to be revolute. Heads about as large as in S. aureus. 



14. S. integerrimus {^nit.): glabrous throughout; stem simple, striate; 

 leaves entire (rarely obscurely repand-denticulate), somewhat fleshy ; the 

 radical and lowest cauline short, lanceolate-oblong, rather obtuse, tapering 

 into a petiole ; the upper small, lanceolate, acute, partly clasping; corymb 

 simple or nearly so ; involucre hemispherical, calyculate with a few loose 



