186 



COMPOSITES. (COMPOSITE FAMILY.) 



Rays white or purple. 



Pappus none. . . . e . x 



Pappus bristly. . . . ' "* i - . 

 Receptacle pitted. 

 Rays white or purple. 



Pappus double. 



Pappus single. Rays about 5. Achenia silky. . 

 Pappus single. Rays numerous. Pappus bristly. . 

 Pappus single. Rays numerous. Pappus scaly. . 

 Rays yellow. 



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

 Pappus double, of the ray flowers none. . . . 

 Pappus single. 



Leaves opposite. Heads large, single or corymbose. . 

 Leaves alternate. Heads racemed or clustered. 

 Leaves alternate. Heads panicled. *, 



Receptacle chaffy. 



Involucre double, the outer 4-leaved, 4-angled. . 

 Involucre imbricated or spreading. 



Maritime shrubs. Pappus 4-toothed. . - - .- -. . 



Herbs. 



Receptacle conical or elongated. 

 Rays persistent. Corolla-lobes velvety. ." . >;- 

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

 Rays deciduous. Achenia compressed. . 

 Receptacle flat. 



Leaves lobed, alternate 



Leaves not lobed. Pappus 2-awned. 

 Leaves not lobed. Pappus none. . . 



Flowers of the disk sterile. 



Rays yellow. Pappus none. 



Rays yellow. Pappus a toothed crown 



Rays yellow. Pappus 2-toothed or awned. Achenia winged. 

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



Rays white. Receptacle conical " 



Rays neutral (without pistils). 

 Receptacle naked, or nearly so. 

 Achenia villous. Pappus scaly, long-awned. 

 Achenia smooth or the angles hairy. Pappus awnless. 

 Receptacle deeply pitted. 



Margins of the pits entire. Perennial 



Margins of the pits toothed. Annual 



Receptacle chaffy throughout. 

 Involucre double. Pappus 2 - 4-awned. 

 Awns of the pappus hispid upward. . . ... 



Awns of the pappus hispid downward. Achenia beakless. 

 Awns of the pappus hispid downward. Achenia beaked. 

 Involucre simple or imbricate. 

 Pappus a cup-shaped border, or none. 

 Chaff of the receptacle elongated, spine-pointed. 

 Chaff of the receptacle not elongated nor spine-pointed. 

 Pappus 2 -4-awned. 



Achenia winged. Leaves divided. Receptacle elongated. 

 Achenia winged. Leaves undivided. Receptacle convex. 

 Achenia wingless. Awns of the pappus deciduous. 

 Achenia wingless. Awns of the pappus persistent. . 

 Receptacle chaffy at the apex. Achenia ribbed. 



No. 



LEUCANTHEMUM. 66 

 ERIGERON. 17 



DIPLOPAPPUS. 18 



SERICOCARPUS. 15 



. ASTER. 16 



BOLTONIA. 19 



CHRYSOPSIS. 24 



HETEROTHECA. 23 



ARNICA. 76 



SOLIDAGO. 20 



. ISOPAPPUS. 22 



TETRAGONOTHECA. 43 

 > BORRICHIA. 39 



ZINNIA. 41 



HELIOPSIS. 42 



SPILANTHES. 53 



ACHILLEA. 65 



VERBESINA. 54 



. ECLIPTA. 38 



POLYMNIA. 30 



CHRYSOGONUM. 31 



SILPHIUM. 32 



BERLANDIERA. 33 



PARTHENIUM. 34 



GAILLARDIA. 56 

 LEPTOPODA. 60 



. BALDWINIA. 61 

 ACTINOSPERMUM. 62 



COREOPSIS. 50 



BIDENS. 52 



. COSMOS. 51 



ECHINACEA. 44 



. RUDBECKIA. 45 



. LEPACHYS. 46 



. ACTINOMERIS. 49 



HELIANTHUS. 47 



HELIANTHELLA. 48 



MARUTA. 64 



