LXXI. COMPOSITjE. 



Subirihe 2. Ambkosie.5:. Heads heterogamous or unisexual, 

 monoecious, Keceptacle paleaceous between the ^ flo\Aers. 

 2 flowers apetalous, fertile ; ^ flowers sterile. Anthers 

 nearly free, with inflexed appendages. Style of ^ flowers 

 undivided. Aclienes smooth. 



Invol. -bracts of ^ flowers free, those of the 

 2 flowers forming a 2-flowered 2-celled 

 capsule armed with glochicliate spines 27. Xantiiium. 



Suhtribe 3. VEEBESiNEiE. Heads heterogamous, rayed or dis- 

 coid ; or homogamous and rayless ; ray-flowers $ , fertile 

 or sterile ; disk-flowers ^ , fertile or the innermost rarely 

 sterile. Pappus cup-shaped or of 2-3 rigid paleaceous 

 bi'istles or 0. Achenes all thick, or those of the ray tri- 

 quetrous, those of the disk laterally compressed. Leaves 

 usually opposite. 



Inner invol. -bracts or outer paleje of the re- 

 ceptacle embracing the fertile achenes of 

 the ray-flowers. 



Outer invol. - bracts 5, narrow, 



glandular 28. SiEfiESBECKiA. 



Inner invol. -bracts not embracing the achenes. 

 Pale.'\J of receptacle flat, narrow. 



Outer invol. -bracts many 29. Eclipta. 



Palcaj of receptacle concave, embracing 

 the achenes. 



Flowers of the I'ay ligulate, sterile; 



pappus or a short ring 30. ScLEKOCAKrrs. 



Flowers of the ray fertile. 

 Achenes not ciliate. 



Ligules small ; pappus of 

 2-5 unequal persistent 



bristles 31. Blainvii.i.ea. 



Ligules large, conspicuous, 

 spreading, yellow ; pap- 

 pus or a toothed cu^i or 



ring, or short scales 32. Wedema. 



Achenes ciliate. 



Ligules small, white or 

 yellow ; jiappus or of 

 2-3 bristles 33. Si'ILaktues. 



Saltribe 4. CoREOPSiDEJi;. IIcacLs heterogaiuous, rayed ; or 

 homogamous, rayless ; ray-flowers 5 , fertile or neuter ; 

 disk-flowers ^ , fertile, or the inner rarely steriI(^ Ee- 

 ceptacle paleaceous. Achenes more or less dorsal ly com- 

 pressed, 2-4-awned or naked. 



Invol.-bracts in two rows ; outer bracts few, 

 Buudl ; inner membranous, often connate 

 below. 



Style-arms truncate, penicillate or with 

 short appendages. 



Leaves alternate 34. CiLnssocAnDiA. 



Leaves opposite 35. Biden.s. 



Style-arms with long hairy appendages . 3G. Glossogv.n'K. 



Suhtribe 5. Galinsoge.'E. Heads heterogamous, rayed ; or 

 homogamous, rayless ; ray-flowers $ (rarely neuter;; chsk- 



