XLIII. COMPOSITE. 128 



' fclorets all ligulate (LIQULAT.S) 88 



J Floret* all tubular 2 



*j Florets tubular in the disk or centre of each head, the outer ones either ligulate 



^ and forming a ray, or slender and filiform (GORYMBITER^K) .... 5 



r Involucre or leaves prickly. Style slightly bulbous under the branches (CTKA- 

 94 ROIDEJI) 80 



( Involucre and leaves not prickly . . 3 



R / Florets purple, blue, or white ...4 



B X Florets yellow or greenish, usually small (CORTMBIFER M) 5 



,/ Leaves opposite L EOPATORIUM. 



\ Leaves alternate or radical (CYXAROIDE.X) ........ SO 



CORYMBIFEBJB. 



,/ Leaves opposite 



X Leaves alternate or radical 7 



( Flower-heads small, numerous, purple. Pappus of many hairs 1. EUFATOKIUM. 

 { Flower heads few, rather large, yellow. Pappus of a few 



( bristles 11. BIDENS. 



Flower discoid, that is, all the florets of the head tubular or filiform, the outer 



not longer than the central ones 8 



Flowers radiate, the outer florets ligulate and spreading, or, if erect, longer than 



the central ones 19 



Achenes without a pappus, or crowned by a small cup or short scales . . 9 



Achenes bearing a pappus of hairs 12 



Flower-heads monoecious, the males with many tubular florets, the females 

 forming a thick burr, ending in 2 conical beaks, and enclosing 2 flowers. 



10. XANTHIUM. 



Flower-heads all alike -. . .10 



Receptacle bearing scales between the florets. Plant covered with a dense 



10 white cotton. Leaves entire or toothed 16. DIOTIS. 



No scales between the florets. Leaves, at least the lower ones, much divided 11 



!" Flower-heads hemispherical. 3 or 4 lines in diameter, in a large terminal corymb. 

 Achenes angular, with a flat top 17. TANACETUM. 

 Flower-heads small, often nodding, in a leafy raceme or panicle. Achenes 

 obovate, contracted at the top 18. ARTEMISIA. 

 Bracts of the involucre linear, equal in length, with a few very small outer 

 ones 13 

 Bracts of the involucre imbricated in 2 or more rows 14 



( Radical leaves large, broadly heart-shaped or orbicular. Stem-leaves small and 



13 ] narrow . 19. TUSSILAQO. 



( Leaves pinnate and toothed 20. SENECIO. 



( Plants more or less covered with a white cotton or down. Involucral bracts also 



14 ( cottony, or shining and scarious, or coloured at the edge . . . .15 



( Plants not woolly. Involucral bracts narrow and green 17 



( Flower-heads dioecious. Involucral bracts with spreading tips, at least in the 



15 4 males 8. ANTENNARIA. 



( Flower-heads all with tubular florets in the centre. Involucres not spreading 16 



lfi / A row of scales within the outer row of florets ..... 6. FILAOO. 



1 \ Receptacle entirely without scales 7. GNAPHALIUM. 



( All the florets tubular and 5-toothed 2. ASTER. 



17 \ Outer florets of the head linear or filiform, although not longer than the cen- 



( tralones 18 



Tall stiff plant. Flower-heads ovoid, In a terminal corymb . 9. INULA Conyta. 

 Flower-heads numerous and small, in a long leafy panicle. 



9. ERIGERON eanadense. 

 Achenes without any pappus, or crowned by a small cup or minute scales . 20 



Achenes bearing a pappus of hairs . . 24 



Receptacle bearing scales between the florets, at least among the central ones 21 

 Receptacle naked (without scales between the florets) 



9 , / Flower-heads rather large, with a convex or conical receptacle 14. ANTHEMIS. 

 z X. Flower-heads small, with a small flat receptacle ; 16. ACHILLEA. 

 99 /Involucral bracts all green and of equal length 6. BELIIS. 



1 Involucral bracts imbricated and scarious at the edges 23 



9 o/ Receptacle flat or convex 12. CHRYSANTHEMUM. 



\ Receptacle conical, much elongated as the fruit ripens . . 18. MATMOAKU, 



