Senecio. compos IT.f:. 445 



than is usual in S. aureus. Scales of the involucre greenish, with scarious 

 margins, not sphacelate. — Were this remarkable plant a northern species, it 

 migfit be supposed to prove the S. Canadensis; which has never been re- 

 cognized. 



* » * » « 



Perennial : heads radiate, solitary or nearly so. 



32. S. resedifolius (Less.): dwarf, glabrous; stems mostly simple and 

 terminated with a single head, leafless above; radical leaves petioled ; the 

 exterior rounded, crenate-sinuate or lobed ; the interior lyrate-pinnatifid, with 

 the segments entire or 2-3-lobed ; the cauline oblong, sessile, pinnatifid at 

 the base, woolly in the axils ; scales of the nearly ecalyculate involucre lance- 

 olate ; rays 12-13, elongateil; achenia minutely and sparsely puberulent; 

 pappus a little shorter than the corolla of the disk. — Less..' in Linvcea, 6. p. 

 243 ; Hook. ! fl. Bor.-Am. 1. p. 333, t. 117 ; DC. ! prodr. 6. p. 347. Cine- 

 raria lyrata, Ledeb. ! fl. Alt. 4. p. 102 (var. with purplish involucre); 

 Reichertb. ic. hot. t. 101 ; Hook- <^* Am.! bot. Beechey, p. 126. 



Arctic America from Kotzebue's Sound! to Fort Franklin ! &c. — Stems 

 2-6 inches high, sometimes sparingly branched above. Heads rather large. 

 — This is not improbably the S. Cymbalaria of Pursh. 



33. S. subnudus (DC) : very glabrous throughout ; stem simple, slender, 

 nearly leafless above and usually bearing a single head ; radical leaves ob- 

 ovate, toothed at the apex, on slender petioles ; the cauline few, sessile, oblong, 

 incised or somewhat pinnatifid, not woolly in the axils; scales of the slightly 

 calyculate involucre linear-lanceolate, acuminate ; rays 8-12, elongated ; 

 achenia glabrous, striate ; pappus nearly equalling the corolla of the disk.— 

 DC! prodr. 6. p. 428; Nutt.! in trans. Amer. phii soc. I. c. p. 412. 



Cascade Mountains on the Oregon, Dr. Gairdner ! Douslas ! Wind 

 River Chain of the Rocky Mountains, at the altitude of 7000 feet and up- 

 wards, Lieut. Fremont! Aug. — Stems often decumbent at the base, 6-10 

 inches high, sometimes bearing 2 heads, which are about as large as in S. 

 aureus. Limb of the radical leaves half an inch in length, occasionally 

 somewhat lyrate. — Allied to the preceding. 



34. S. Fremontii: dwarf, glabrous; stems ascending, leafy, often branch- 

 ing; the branches naked at the summit and terminated by a solitary head ; 

 leaves somewhat fleshy, obovate and spatulate-oblong, very obtuse, some- 

 times mucronulate; the upper sinuate-toothed or slightly lyrate, sessile; the 

 lowest angulate-toothed or nearly entire, tapering into a short margined pe- 

 tiole; scales of the ecalyculate involucre in a single series, linear-lanceolate; 

 rays 8-10, oblong-linear; achenia (immature) puberulent; pappus equalling 

 the corolla of the disk. 



On the Wind River Chain of the Rocky Mountains, just below the limits 

 of perpetual snow, Lieut. Fremont! Aug. — Stems 3-5 inches high. Leaves 

 an inch or more in length. Heads about half an inch in length ; the cylindri- 

 cal-cam pan u late involucre many-flowered, subteuded by one or two small 

 lanceolate bracteoles. 



35. S. frigid us [Ijes^.): stem simple, bearing a single head, glabrous, or 

 clothed with deciduous floccose wool and blackish-purple hairs; leaves ellip- 

 tical-oblong, obtuse, with short petioles [the cauline sessile and partly clasp- 

 ing], glabrous or hirsute; the margins revolute, entire or slightly denticulate; 

 involucre ecalyculate, hispid with purple hairs; rays numerous, oblong-ellip- 

 tical ; achenia glabrous ; pappus as long as the tube of the disk-flowers. DC. — 

 Less, in Linnia, G.p. 239; Hook. ! fl. Bor.-Am. 1. p. 334. 1. 112; DC. prodr. 

 6. p. 347. Cineraria frigida, Richards, appx. Frankl. journ. ed. 2. p. 31 ; 

 Hook. 8f Am.! bot. Beechey, p. 126. C. atropurpurea, Ledeb. in metn. acad. 

 St. Petersb. 5. p. 274. 



