186 



COMPOSITE. (composite FAMILY.) 



Rays white or purple. No. 



Pappus none. . LEUCANTHEMUM. 66 



Pappus bristly ERIGERON. 17 



Receptacle pitted. 

 Rays white or purple. 



Pappus double. DIPLOPAPPUS. 18 



Pappus single. Rays about .5. Achenia silky. . . SERICOCARPCS 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 IIETEROTHECA. 23 



Pappus single. 



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



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



Leaves alternate Heads panicled ISOPAPPUS. 22 



Receptacle chaffy. 



Involucre double, the outer 4-leaved, 4-angled. . . . TETRAGONOTHECA. 43 

 Involucre imbricated or spreading. 



Maritime shrubs. Pappus 4-toothed. BORRICHIA. 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. .... VERBESINA. 54 



Leaves not lobed. Pappus none. ECLIPTA. 38 



Flowers of the disk sterile. 



Rays yellow. Pappus none POLYMNIA. 30 



Rays yellow. Pappus a toothed crown . CHRYSOGOXUM. 31 



Rays yellow. Pappus 2-toothed or awned. Achenia winged. . . SILPHIUM. 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. .... GAILLARDIA. 56 



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

 Receptacle deeply pitted. 



Margins of the pits entire. Perennial BALDWINIA. 61 



Margins of the pits toothed. Annual ACTINOSPERMUM. 62 



Receptacle chaffy throughout. 

 Involucre double. Pappus 2 - 4-awned. 



Awns of the pappus hispid upward COREOPSIS. 50 



Awns of the pappus hispid downward. Achenia beakless. . . BIDENS. 52 



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. . . . ECHINACEA. 44 



Chaff of the receptacle not elongated nor spine-pointed. . . RUDBECKIA. 45 

 Pappus 2 - 4-awned. 



Achenia winged. Leaves divided. Receptacle elongated. . . LEPACHYS. 46 



Achenia winged. Leaves undivided. Receptacle convex. . ACTINOMERIS. 49 



Achenia wingless. Awns of the pappus deciduous. . . HELIANTHUS. 47 



Achenia wingless. Awns of the pappus persistent. . . IIELIANTHELLA. 48 



Receptacle chaffy at the apex. Achenia ribbed MARUTA. 64 



