34:2 FLORA or TEXAS. 



** Stems leafy; leaves undivided, alternate, opposite, or wTwrUd. 

 t Stems terete. 



S. AsTERiscus, L. Stem smooth or hirsute ; leaves rough, 

 opposite or alternate, or the lower ones sometimes 3 in a 

 whorl, lanceolate or oblong, toothed, on short hirsute 

 petioles; the upper ones sessile and commonly entire; 

 lieads somewhat corymbose, rather large; exterior scales 

 of the involucre ovate, acute, short-ciliate, the interior ob- 

 long, obtuse; achenia broadly obovate, 2-toothed. Stem 

 2°-4° high; leaves 3-5' long; rays showy. 



S. scABERRiMU3r, Ell. Stem rough-hairy ; leaves mostly 

 opposite, ovate, acute, serrate, rigid, very rough on both 

 sides, on short petioles; heads corymbose; scales of the 

 involucre ovate, ciliate ; acheyiia nearly orbicular, broadly 

 winged, deeply notched at the apex. Stem stout, 3°-4° 

 high, becoming smoothish ; leaves 3-4' long ; heads larger 

 than in the last. 



tt stems square. 



S. PERFOLiATUM, L. Stem and Iranclies smooth or hairy ; 

 leaves large, opposite, ovate or ovate-oblong, coarsely tooth- 

 ed, rough on both sides, or pubescent or hairy beneath, 

 their bases, or winged petioles, united, the uppermost com- 

 monly entire, simply serrate; corymb trichotomous; the 

 central heads long-peduncled ; scales of the involucre ovate, 

 obtuse; achenia broadly obovate, emarginate. Stem 4°-6° 

 high; leaves 6-12' long; heads large. 



BERLANDIERA, DC. 



Heads many-flowered ; ray-floioers few, pistillate ; those 

 of the disk tubular, 5-toothed. sterile; scales of the invo- 

 lucre in three rows, the innermost largest, membranaceous, 

 adherent to the fertile achenia ; receptacle chaflf)^ the chaff 

 dilated upward, obtuse, hooded, partly embracing the 

 sterile achenia, the inner ones gradually narrower; fertile 



