COMPOSITE, 437 



Style-arms with a long appendage; 

 ray-flowers fertile ; leaves pinna- 

 tifid or toothed. 



Leaves mostly radical; achenes 

 with 2 persistent bristles . 31. Glosbogyne. 



Leaves mostly cauline, alt. ; 

 achenes not awned , . 32. Chbtsanthellum. 



Heads hetarogamous and rayed : flowers 

 all fertile; receptacle paleaceous; 

 pappus of scales or of plumose bristles, 

 Pappus-scales"fimbriate. . • 33. Galinsoga. 



Pappus scales awned, plumose . 34. Teidax. 



TRIBE VI.— ANTHEMIDE.a:. Heads heterogamous, rayed or discoid, 

 or homogamous and ray less. Invol-hracts 2-many- seriate, dry or 

 with scarious tips. Receptacle usually naked. Anther-cells not 

 tailed. Style-arms truncate. Pappiis ecroniform, ear-shaped or 0. 

 Leaves usually alt. 



Heads rayed • • • . • 35. Matricaria. 



Heads disciform. 



Heads solitary, on slender peduncles; 



cor. of disk-flowers 4<-fid. . , 36. Cotula. 

 Heads racemose or panicled : cor. of 



disk-flowers 5-fid . . . .37. Artemisia, 



TRIBE VII.— SENECIONIDE.^. Heads heterogamous, rayed or 

 discoid, or homogamous and rayless. Invol-hracts usually 1-seriate, 

 subequal. with a few shorter outer ones below. Receptacle usually 

 naked. Anther-cells obtuse at the base, rarely tailed (in Senecio). 

 Style-arms of 2-sexual flowers truncate or appendaged. Pappus of 

 fine hairs. Leaves usually alternate. 



Heads homogamous. the flowers all 

 tubular, pinkish-violet or white, style- 

 arms appendaged . . . .38. Emilia. 



Heads heterogamous the fem. flowers 

 usually ligulate, style-arms truncate . 39. Senecio. 



TRIBE VIII.— CYNAROIDE^. Floivers all tubular. Invol-hracts 

 many-seriate, imbricate, tips often with a scarious spinous or leafy 

 appendage. Receptacle densely bristly or paleaceous, rarely simply 

 pitted, often fleshy. ^Cor-limh narrow, deeply 5-fid. Anther-cells 

 tailed. Style subentire, or with short hairy arms thickened 

 towards the base. Pappus of pales or bristles, rarely 0. Achenes 

 often hard. Leaves alt. frequently spinous. 

 Heads 1-flowered, crowded into in- 

 volucrate balls; achenes villous, 

 pappus of bristles . . . .40. Echinops. 



