XLVI. COMPOSITE. 



207 



III Florets of the same head all homogamous (and usually tubu- 

 lar) ' or those of the circumference filiform or tubular and pistillate, 

 or ligulate. Style of the perfect florets not swollen below its 

 branches. Corymbifer^, 



1. All the florets with corollas. Involucre not prickly. 



* Pappus of2~-5 persistent awns. 



24, BiDENS. Eeceptacle with scales. Achenes compressed or angular. 



** Pappus 0, or a mere border, or of short teeth or scales only. 



r 



f Receptacle with scales. Pappus 0. 



45 Anthemis. Heads heterogamous, with a ray. Florets of the ray 



oblong-linear. Achenes terete, or obscurely angled. 

 45» Anacyclus. Heads heterogamous with a ray. Florets of the ray 



oblono'-linear. Achenes compressed, winged at the edges. 



46 "Achille^v. Heads heterogamous, with a distinct ray. Florets of 



the ray, short obovate. Achenes compressed. 

 25. DioTis. Heads homogamous, discoid. Florets and achenes com- 

 pressed. 



■j-f Eeceptacle without scales. 



42 Bellts. Heads heterochromous. Florets of the ray ligulate, con- 

 spicuous. Scales of the invoL nearly equal in length. Achenes 

 compressed; epigynous disk minute. 



27 Arteaiisia. Heads discoid, homochromous ; ligulate florets, when 



present, short or filiform. Invol. imbricated, Achenes with a 



minute epigynous disk. ^ 



26 Tan\cetum. Heads discoid homochromous and homogamous, or the 



florets of the circumference with a short ligule. Achenes with a 



large epigynous disk. ^ ^ .-, 



44. Matricaria, Heads heterochromous, florets of the ray conspi- 

 cuously ligulate, of the disk terete. Achenes of the disk and ray 

 similar, angled. Epigynous disk large. ^ ,■,... n.r^ 



43. Chrysanthemum. Florets of the ray conspicuously ligulate, ot the 



disk compressed at the base. Achenes of the disk somewhat te- 

 rete. Epigynous disk large. 



*** 



Pappus pilose. Heads discoid. Florets all perfect. 



29. 



37. 



28. EuPATORiuM. Style much exserted, with long blunt branches. 



(Flowers never yellow.) * x ^ i i • 



LiNosYKis. Style slightly longer than the cor. Tnyol. loosely im- 

 bricated, or of one row of equal scales, surrounded by several long 

 ones. Achenes compressed. (Flowers yellow.) .. , . i 



Senecio. Style slightly longer than the cor. Invol. cyhndrical or 

 conical, of one row of equal scales with several small ones at tne 

 base. Achenes terete. 



**** Pappus pilose. Heads discoid. Florets of the circumference, or all, 



imperfect. 



30. Amtennaria. Dioecious. Heads dioecious. Invol. imbricated, dry 



and scarious. 



31, GNArHALiuM. Heads heterogamous, all similar. Invol, imbricated, 



dry and scarious. Eecept. flat and quite naked. 



r 



