186 



COMPOSITE. (COMPOSITE FAMILY.) 



Rays white or purple. No. 



Pappus none LEUCANTHEMUM. 66 



Pappus bristly . . ERIGERON. 17 



Receptacle pitted. 

 Kays white or purple. 



Pappus double DIPLOPAPPUS. 18 



Pappus single. Rays about 5. Achenia silky. . . . SER1COCARPUS 15 



Pappus single. Rays numerous. Pappus bristly ASTER. 16 



Pappus single. Rays numerous. Pappus scaly. . . . BOLTONIA. 19 



Rays yellow. 

 Pappus double, of the ray and disk flowers alike. . . . CHRYSOPSIS. 24 



Pappus double, of the ray flowers none HETEROTHECA. 23 



Pappus single. 



Leaves opposite. Ilcads large, single or corymbose. . . . ARNICA. 76 



Leaves alternate. Heads racemed or clustered. . . . SOLIDAGO. 20 



Leaves alternate Ileads panicled ISOPAPPUS. 22 



Receptacle chaffy. 

 Involucre double, the outer 4-lcaved, 4-angled. . . . TETRAGONOTIIECA. 43 

 Involucre imbricated or spreading. 



Maritime shrubs. Pappus 4-toothed. ' BORRICIIIA. 39 



Herbs. 

 Receptacle conical or elongated. 



Rays persistent. Corolla-lobes velvety ZINNIA. 41 



Rays deciduous. Achenia 3 - 4-angled HELIOPSIS. 42 



Rays deciduous. Achenia compressed SPILANTHES. 53 



Receptacle flat. 



Leaves lobed, alternate ACHILLEA. 65 



Leaves not lobed. Pappus 2-awned. .... VE1USES1NA. 64 



Leaves not lobed. Pappus none. ECLIPTA. 38 



Flowers of the disk sterile. 



Rays yellow. Pappus none POLY.MNIA. 30 



Rays yellow. Pappus a toothed crown CIIRYSOGONUM. 31 



Rays yellow. Pappus 2-toothed or awrted. Achenia winged. . . SILPH1UM. 32 

 Rays yellow. Pappus 2-toothed or awned. Achenia wingless. . BERLANDIERA. 33 



Rays white. Receptacle conical PARTHENIUM. 34 



Rays neutral (without pistils). 

 Receptacle naked, or nearly so. 

 Achenia villous. Pappus scaly, long-awned. .... GAILLAKDIA. 66 



Achenia smooth or the angles hairy. Pappus awnless. . . ■ LEPTOPODA. 60 

 Receptacle deeply pitted. 



Margins of the pits entire. Perennial RALDW1NIA. 61 



Margins of the pits toothed. Annual ACTINOSPERMUM. 89 



Receptacle chaffy throughout. 



Involucre double. 1'appus 2-4-awncd. 



Awns of the pappus hispid upward. COREQPSIS. 60 



Awns of the pappus hispid downward. Achenia beaklcss. . . BIDEN8. 69 

 Awns of the pappus hispid downward. Achenia beaked. . • • COSMOS. 51 

 Involucre simple or imbricate. 

 Pappus a cup-shaped border, or none. 

 Chaff of the receptacle elongated, spine-pointed. . • • ECHINACBi 

 Chaff of the receptacle not elongated nor spine-pointed. • • RTJDBKOKIA. IB 

 I'appu 'j t awned. 

 Achenia winged. Leaves divided. Receptacle elongated. • LBPACHY8. 48 



Aohenla winged. Leaves undivided. Receptacle convex. • aCTTHOMBRIB. 49 

 Aohenia wingless. Awns of the pappus deciduous. . • HBLIANTHTJ8. 47 

 Aohenla wingless. Awns of the pappus persistent. • • BELLAS fTHBLLA. i^ 

 Receptacle chaff/ at the apex. Aohenla ribbed MARUTA. 64 



