2G6 COMPOSITE. (COMPOSITK FAMILY.) 



81. SENECIO, I- (luoINDSKI., ]{l TTKH-WEED. 



Heads in.iiiv-tUnveiod ; tlie Howers iill luhuliir iiii<l jicrfi-ct, or with pistillate 

 rays. Si-ah'S of the involucre in a single row, often hracteil. lUceptatle 

 naked or alveolate. Aeiienia not l>eiiked nor winged. Tapjiusof copious soft 

 hairs. — Ilerhs, with entire or pinnately divided leaves. Heads corymbose. 

 Flowers jellow. Pubescence mostly webi)y and deciduous. 

 * Annual: heads radiate. 



1. S. lobatus, I'ers. Smooth; stem furrowed, liolbnv ; loaves tender, 

 lyrate-pinnatifid, with rounded- toothed lobes; the earliest orbicular, loug- 

 petioled ; rays aliout 12. — Hiver bottoms. March- April. — Stem \°-3° 

 hiij;ii. Lolling of tiie loaves variable. 



** Perennial: heads radiate: loiresl leaves petioled, undivided; the others 

 jiinnateli/ lohed or toothed ; the upjiermosl sessile. 



2. S. aureus, L- Smooth, or more or less woolly when young ; stem {2° 

 hio-h) sbnib'r; radical leaves longpetiolod, round-cordate, crenate ; the others 

 lanceolate or oblong-lanceolate, jiinuatitid ; rays 8- 12; achenia smooth. — 

 Mountains of North (Carolina. July. 



Var. obovatUS, Torr. & Gray. Sinoothish ; leaves chiefly radical, thick, 

 obovate or roundish, creuate, ou short winged petioles; those of tiie stem 

 small, pinnatifid ; heads crowded; rays 9-12; achenia smooth. — Kocky 

 places, West Florida to North Carolina. Ajiril-May. — Stem 1° high. 

 Radical leaves 2' -3' wide. 



Var. Balsamitse, Torr. & Gray. Radical leaves spatulate-lanceolate or 

 obovate; lower part of the stem often densely woolly ; achenia hairy. — Dry 

 open woods ill the ii|i])or districts. May- June. 



3. S. tomentOSUS, Michx. Woolly and hoary throughout; the leaves 

 becoming smoothish ; lowest leaves oblong, crenate, obtuse ; stem leaves few, 

 scattered, lanceolate, acute, serrate or toothed ; rays 12 - 15 ; achenia hairy. — 

 Damp soil, Florida to North Cai-olina. April -May. —Stems mostly simple, 

 2° - 3° high. Heads rather large. 



* * * Perennial: heads radiate : leaves all hipinnateli/ dissected. 



4. S. Millefolium, Torr. & Gray. Woolly when young, at length 

 nearly SHU )otli ; steins tufted, corymbose above; leaves lanceolate, with the 

 divisions linear and toothed, the lowe.st ones petioled ; heads crowded ; rays 

 9-12. — M(mntainsof North Carolina [Buckleij). June. — Stems l°-2°high. 



* * * * Perenni(d : heads large, discoid : leai^es all entire. 



5. S. Rugelia, Gray. Minutely pubescent ; rhizoma creeping ; stem 

 simple, erect ; loaves ovate, acute at each end, denticulate; the lowest large 

 (2' -4'), crowded, on long margined petioles, the others small, scattered, and 

 nearly sessile ; heads on long bracted peduncles. — Smoky Mountains, Ten- 

 nessee (Rufjel, Buckley). — Stem 1^ high. 



82. ERECHTHITES. Raf. Fireweed. 



Heads many-flowered, discoid ; the marginal flowers pistillate, very slender, 

 2-3-toothed; the others perfect, 4-5-toothed. Scales of the cylindrical 



