360 FLORA OF TEXAS. 



ed above ; leaves glaucous beneath, angularly lobed, the 

 lobes mostly entire, mucronate, the lowest ones reniform, 

 the upper rhomboid ; covymOs compound. Stem 4°-S° 

 high ; leaves smaller and tliicker than the last 



SENECIO, L. Groundsel; Butter-tveed. 



^atZd^ many-flowered ; t\iQ flowers all tubular and per- 

 fect, or with pistillate rays; scales of the involucre in a 

 single row, often bracted ; recejjtacle naked or alveolate ; 

 achenia not beaked nor winged; pappus of copious soft 

 hail's. — Herbs, with entire or pinnately divided leaves; 

 heads corymbose; flowers yellow; pubescence mostly 

 webby and deciduous. 



* Annual ; heads radiate. 



S. LOBATUS, Pers. Smooth ; stem furrowed, hollow ; 

 leaves tender, lyrate-pinnatifid, with rounded toothed 

 lobes, the earliest orbicular, long-petioled ; rays about 12. 

 Stem l°-3° high ; lobing of the leaves variable. 



** Perennial ; head^ radiate ; lowest leaves petioled, vndhided, i?u others 

 pinnately lobed or toothed, the uppermost sessile. 



S. AUREUS, L. Smooth, or more or less woolly when 

 young; stem (2*^ high) slender; radical Ze^r^s long-petioled, 

 round-cordate, crenate; the others lanceolate or oblong- 

 lanceolate, pinnatifid; rays S-12; ache7iia smooth. 



Var. Balsamit^. Radical leaves spatulate-lanceolate or' 

 obovate ; lower part of the stem often densely woolly ; 

 achenia hairy. 



CENTAUEEA, L, Star-thistle. 



Herhs, with alternate leaves; heads solitary, many- 

 flowered ; marginal flowers large and sessile ; receptacle 

 bristly ; involucre imbricated ; achenia compressed ; pap- 



