Senecio. | COMPOSIT (Harv.) 347 
** Semiglabri: glabrous, except the densely gland- 
pubescent peduncle, bractex, pedicels, and invo- 
lucres ; lvs. pinnatifid .. «.. (17) trachylenus. 
badiahad Pubescentes. Branches and leaves, ¢ or whole plant scabrid-pubescent : 
Lvs. bipinnatisect or pinnatisect, with linear lobes: 
Diffuse or decumbent ; heads few, calycled (18) diffusus. 
Erect : upper lvs. pinnatisect ; heads pani- 
cled, nearly nude at base... ... ... (19) Paarlensig, 
Lys. lance-linear, entire or toothed... ... ... (20) puberulus, 
Lvs. petioled, some ovate-oblong, some lyrate (21) sisymbrifolius. 
Lys. oblong, obtusely pinnatifid or sinuate-toothed : 
Inv. quite glabrous, of 10-12 oblong scales (22) glutinarius, 
Inv. gland-scabrid, of ee linear-subulate 
scales... ; .» « (23) glutinosus, 
(c.) Heads radiate. Ray flowers ‘purple : 
Iny. conspicuously calycled at base : 
Calycle of broad, short, ciliate bracteoles... ... (24) elegans. 
Calycle of lanceolate bracteoles as long asinv. se. (25) multibracteatus. 
Inv. nude at base or nearly so: 
Viscoso-pubescent: leaves polymorphous _... (26) arenarius. 
Glabrous, or sparsely hispidulous : 
Leaves pinnatipartite, with blunt lobes ... (27) eakilefolius. 
Leaves kteigmeecranisoras with narrow-linear 
lobes.. a (13) sophioides, 
§ 2. Smyvost Rootstock perennial. Radical leaves several, larger than the cauline, 
mostly sinuous-pinnatifid, pinnatifid, or incised, rarely entire, very generally pubescent 
or viscidulous. Stem herbaceous, subsimple, nude or leafy, one or loosely several 
headed. Heads many-fi., radiate or discoid; flowers purple or yellow. (Sp. 28-49.) 
(a.) Heads radiate; disc and ray flowers purple: 
Radical and lower leaves sessile; stem leafy, racemose 
above. ... (28) macrocephalus, 
Rad. and lower eaves petioled’; ‘stem ‘nude and 
forked above, subcorymbose ... ... -- .. (29) concolor. 
(b.) Heads discoid; the disc-fl. purple; 
Stems branchin g; fi. branches nude, forked or corymbose ; leaves rarely ane, 
commonly lyrate or pinnatifid: Be 
Glandularly pubescent, viscidulous : : 
Corymbs Jaxly few-headed; achenes pubes. (30) er 
Corymbs — many- -headed, compound ; 
Tous; ss 
and upper leaves sessile... ... (31) purpureus. 
Medial and upper lvs. decurrent as a 
stem-wing ones 45a) odontopterus. 
Glabrous: leaves pinnatisect, ‘with cutlobes ... (33) glabrifolius. 
Stems simple, closely leafy nearly to the summit: 
Pubescence of long, jointed, white hairs: 
Heads corymbose ; upper lvs. piiaperte 4-5 
lines wide, flattish . as ach os (34) barbatus. 
Heads panicled ; upper -Ivs. x, 1 line wi e, : 
revolute-edged... (35) thyrsoideus. 
Pubescence of short, scabrid, close, knappy hairs (36) Sandersoni. 
(c.) Heads discoid; the dise-fl. yellow: 
Glabrous. Stem much branched, cauline lvs. coarsely 
—_ OF CGb conc. (37) incomptus., 
Sea! t. Stem sub-simple, "few-headed, laxly leafy: 
“Lower-ivs. linear-lanceolate, acuminate, with 
(38) asperulus, 
edges... 
Lower-lvs. petioled, oblong or obovate, flat, toothed : 
Heads loosely corymbose, 40-50 fl.... ... (39) serratus. 
