442 COMPOSITE. Senecio. 



lower leaves ovate, tapering into a petiole partly clasping at the base, un- 

 equally toothed, glabrous above, arenose beneath ; the upper sessile, oblong, 

 acute, partly clasping by the auriculate somevi^hat adnate base, coarsely 

 toothed, arenose on both sides ; corymb terminal, crowded ; the calyculate 

 involucral scales about 10, acuminate, arenose; rays none; the tubular 

 flowers 10-12; achenia glabrous. — DC. prodr. 6. p. 426. 



California, Douglas. — Herb 8-10 inches high. Lower leaves 5 inches 

 long, including the petiole. DC. 



t t t t Radical leaves undivided ; the cauline incised or pinnatifid : involucre 

 nearly ecalyculate. 



23. S. aureus (Linn.) : glabrous, or mostly somewhat arachnoid-woolly 

 when young ; radical leaves orbicular or roundish-ovate, mostly cordate, 

 crenate-serrate, petioled ; the lower cauline lyrate ; the upper lanceolate, 

 laciniate-pinnatifid, sessile or partly clasping ; the segments mostly toothed 

 at the apex ; corymb somewhat umbellate ; rays 8-12 ; achenia glabrous. — 

 Linn. spec. 2. p. 870; Michx.! fl. 2. p. 120 ; Pursh! fl. 2. p. 530; Ell. 

 sk. 2. p. 331 ; Bigel. .' fl. Bost. ed. 2. p. 307 ; Hook. ! fl. Bor.-Am. 1. p. 

 333 ; Darlingt. ! ji. Cest. p. 497 ; DC. ! prodr. 6. p. 432. S. tussilaginoides, 

 Walt. Car. p. 208. S. fastigiatus, Schweinitz! in Ell. I. c. S. gracilis, 

 Pursh ! fl. 2. p. 529; DC! I.e. (a depauperate state.) — Earliest radical 

 leaves, small and round, seldom cordate, on shorter petioles ; the succeeding 

 larger, on long petioles. 



/?. ohovatus : radical leaves varying from roundish-obovate to oblong- 

 spatulate. — S. ohovatus, Muhl. in Willd. spec. 3. p. 1999 ; Pursh, I. c. ; 

 Ell. I. c. ; Darlingt. ! I. c. ; DC. ! I. c. S. aureus (i. gracilis. Hook. ! I. c. 

 — A large state, with heads of unusual size, is S. Balsamitae /J. majus, 

 Hook. ! I. c. 



J. borealis : radical leaves thickish and somewhat coriaceous, obovate, 

 cuneate-spatulate, and oval, mostly crenulate-toothed at the apex only, or 

 some of them entire ; stem short (5-12 inches high) ; corymb of few or nu- 

 merous heads. — S. aureus, partly. Hook..' I. c. S. cymbalarioides, Nutt..' 

 in trans. Amer. phil. soc. I. c. p. 412. 



6. discoideus (Hook. 1. c.) : rays wanting. — A rayless state of var. /3. is 

 S. elongatus, Pursh.' fl. 2. p. 529 ; of var. 7. (from Labrador!) is S. pauci- 

 florus, Pursh .' I. c. (heads rarely solitary I) : an Oregon plant, with some of 

 the oblong radical leaves sinuate-toothed or lyrate is S. debilis, Nutt. ! in 

 trans. Amer. phil. soc. I. c. : an Arctic American form, with the primordial 

 radical leaves often as in var. 7. but the succeeding thin, ovate, and sharply 

 serrate-toothed (corymb of few or several heads) is S. discoideus, Hook..' I.e. 



£. Balsamitae : glabrous or more downy ; radical leaves oval, oblong, 

 spatulate, and lanceolate (often varying greatly on the same individual, 

 crenate or rather sharply crenate-toothed, some of them occasionally lyrate- 

 incised ; achenia either glabrous or strigose-puberulent on the angles. — S. 

 Balsamitffi, Muhl. in Willd. ! spec. I. c. (4* in fl.. Lancastr. ined., when the 

 achenia are said to be glabrous); Pursh ! I. c. ; Darliiigt. ! I. c. ; DC. ! I. c. 

 excl. syn. S. Plattensis, Nutt. ! in trans. Amer. phil. soc. I. c. — Specimens 

 collected at the same time from the same locality, not distinguishable in any 

 other respect, have the achenia either glabrous, or minutely hairy on the 

 angles ; the latter are most common. 



X. 1 lanceolatus (Oakes) : stem slender, loosely and sparingly corymbose at 

 the summit; leaves thin, lanceolate-oblong; the radical on long petioles, 

 unequally and sharply serrate, subcordate or cuneate at the base ; the cau- 

 line few, sessile, laciniate-pinnatifid towards the base ; rays 6-8 ; achenia 

 glabrous. — Oakes ! in Hovey's mag., Sf in Tliompsoii's gazetteer of Ver- 

 mont. 



