T.xxi. co:mposit.5. 



Suhtrihe 2. LycHxopHOEE.i;. Heads 1- or few-flowered, crowded 

 into dense masses like single heads. 



Corollas usually cleft laterally ; pappus- 

 Lairs rigid, shining 5. Elepiiantopus. 



Tkibb II. EUPATORIE^. Heads homogamous ; flowers all ^ , 

 tubular. Anthers subentire at the base. Style-arms usually 

 elongate, obtuse, minutely papillose. Leaves opposite or alter- 

 nate. Corollas rarely orange, never truly yellow. Pappus 

 usually setose. 



Anthers truncate, minutely apiculate at the 



apex 6. Adenostf.m.ma. 



Anthers appendiculate at the apex 7. Agerati'M. 



Tkibe III. ASTERE.ffi. Heads heterogamous, rayed or discoid ; 

 or homogamous, rayless. Anther-basts subentire, not tailed. 

 Style-arms flattened or plauo-convex, all or those of the disk- 

 flowers terminated by a cone. Leaves usually alternate. Disk- 

 flowers usually yellow ; ray-flowers variously colored. 



Subtrihe 1. Grais'geinejE. Corollas of 2 flowers 2-go -seriate 

 not exceeding the disk, 2-toothed or campanulate at the 

 apex. Invol. -bracts subequal or the exterior foliaceous. 

 Pappus or very short. 



Top of receptacle flat ; pappus or of a few 



bristles; margins of aciienes thickened ... 8. Diciirocepitai.a. 



Top of receptacle concave ; pappus ; mar- 

 gins of achenes not thickened 9. Cyathocline. 



Receptacle convex or conic, naked ; pappus 



a short tube with fimbriate mouth 10. Grangea. 



Suhtrihe 2. Heteeocheome^. Corollas of $ flowers ligulate, 

 never yellow ; pappus-hairs long, copious. 



Invol.-bracts narrow 11. Ekigerojt. 



Suhtrihe 3. Conyzete. $ flowers when present filiform or 

 scarcely minutely ligulate, yellow ; pappus setose. 

 Invol.-bracts 2-00 - seriate 12. Conyza. 



Teibe IV. INULE.ffi. Heads heterogamous, discoid or rayed ; or 

 homogamous, rayless. Anther-bases tailed (except Laggera). 

 Style-arms linear, obtuse, inappendieulate, or the style of the 

 sterile floMers undivided. Leaves usually alternate. Disk- and 

 ray-flowers usually yellow. 



Suhtrihe 1. Plucheine^, Heads androgynous. Invol.-bracts 

 herbaceous or dry, or the inner scarions. Eece})tacle naked. 

 Style-arms of ^ flowers filiform (not truncate), or the style 

 of the sterile flowers undivided. 



Heads disiinct, solitary, corymbose or pani- 

 culate (rarely in globose masses in some 

 Blwmeas). 



Pappus-hairs slender, copious. 

 Herbs. 



Invol.-bracts narrow, herba- 

 cciius or slender; styles of 

 ^ flowers 2-lJd. 



Anthers tailed ].". Elcmea. 



Anthers not tailed 14. La(;(.k[ia. 



