436 



COMPOSITE. 



pappus cup-shaped or of 2-5 palea- 

 ceous bristles or ; acheaes all thick, 

 those of the ray triquetrous, of the 

 disk laterally compressed. Leaves 

 usually opposite, 



• Inner invol-hracts or the outer 

 paleae of receptacle embracing the 

 fertile achenes ; outer invol-bracts 

 5, narrow, glandular . 



Inner invol-bracts not embracing 

 the achenes. 



Paleas of receptacle flat and 

 narrow, outer invol-bracts 

 many 



Paleae of receptacle concave, 

 embracing the achenes. 



Eay-flowers sterile, ligulate, 

 yellow ; pappus 0, or a ring . 



Eay-flowers fertile. 



Ligules small, yellow or 

 whitish; achenes not cili- 

 ate ; pappus of 2-5 bristles, 

 connate at base 



SlEGESBECKIA. 



24. ECLIPTA. 



25. SCLEEOCARPUS. 



26. Blainvillea. 



Ligules large, yellow ; 

 achenes not ciliate ; pap- 

 pus 0, or a toothed cup 

 or ring or of short scales . 27. Wedelia. 



Ligules small, white or yel- 

 low ; achenes ciliate ; pap- 

 pus or of 2-3 bristles . 28. Spilanthes. 



Heads heterogamous and rayed, or 

 homogamous and rayless ; ray-flowers 

 f em. or neuter ; disk-flowers 2-sexuaI 

 and fertile, or the inner rarely 

 sterile ; receptacle paleaceous; achenes 

 dore or less dorsally compressed ; 

 pappus or 2-4 awns, or 0. 



Style-arms with a short appendage. 



Leaves alt., pinnatisect ; ray- 

 flowers fertile; achenes 2- 

 awned 29. Glossocardia. 



Leaves opp., toothed lobed 

 or pinnatisect ; ray-flowers 

 jsterile; achenes 2-4i-awned . 30. Bidbns. 



