250 COMPOSITE 



Tribe 3. InuloidecB. — Leaves scattered : ray-florets Itgulate, yellow, 

 or absent : disk-florets tubular, perfect, usually yellow : anthers with 

 2 bristles at their base : pappus-hairs generally slender, silky. 



7. FiLAGO. — Florets all tubular, the outer carpellate, the inner 

 perfect ; receptacle conical, with few scales at the margin ; pappus 

 of slender silky hairs. 



8. Antennaria. — Heads sub-dioecious ; florets all tubular ; 

 pappus hairy, that of the staminate florets with club-shaped hairs. 



9. Gnaphalium. — Florets Sis in Filago ; receptacle flat, naked; 

 pappus oi slender silky hairs. 



10. Inula. — Ray-florets ligulate, yellow, carpellate; disk-florets 

 tubular, perfect ; receptacle naked ; pappus of one row of hairs. 



1 1. PuLiCARiA. — Differing from Inula chiefly in having an outer 

 row of short scales to the pappus. 



Tribe 4. Helianthoidece. — Leaves opposite : ray-florets ligulate, 

 yellow, carpellate or neuter, or absent: disk-florets tubular, perfect, 

 generally yellow : receptacle scaly : anthers not tailed : pappus of a 

 few stiff scales or bristles. 



■^12. Xanthium. — Heads monoecious; staminate florets msLuy ; 

 anthers free ; carpellate florets 2, enclosed by the spinous involucre. 



1 3. BiDENS. — Ray-florets generally absent ; if present, neuter ; 

 pappus of 2 — 5 barbed bristles. 



*i4, Galinsoga. — Ray-florets few, in one row; receptacle 

 conical ; pappus of one row of broad ciliate scales. 



Tribe 5. Anthemidece. — Leaves scattered: ray-florets ligulate or 

 tubular : anthers not tailed : pappus absent or minute. 



15. Achillea. — Ray-florets few, ligulate, white, broad ; receptacle 

 scaly ; jruit compressed ; no pappus. 



16. DiOTis. — Florets all tubular, perfect, with 2 persistent spurs 

 at the base of the corolla ; receptacle scaly ; fruit compressed ; no 

 pappus.^ 



17. Anthemis. — Ray-florets in one row, ligulate, white, oblong, 

 carpellate or neuter, or absent ; receptacle convex, scaly ; fruit 

 not compressed ; no pappus. 



18. Chrysanthemuinl — Ray-florets in i row, ligulate, white or 

 yellow ; receptacle flat or nearly so, naked ; no pappus. 



19. Matricaria. — Ray-florets in i row, ligulate, white; recep- 

 tacle conical, naked ; no pappus. 



*2o. CoTULA. — Florets all tubular, the outer row carpellate ; 

 corolla 4-lobed, with 2 spurs at the base ; receptacle flat, naked ; no 

 pappus. 



