I'UG 



tOMPOSIT.*:. ((•OMl'f>SITK FAMILY.) 



Receptacle flat. 



LicnveH lubud, alti-rimte ACHILLEA. 



Loaves lobeil, uppuHito WEDELIA. 



Leaves not lobed. Pujiptis 2-awued ..... VKK11KS1N.\. 



Leaves not lobed. Pappus none ...... KCLIITA. 



Flowers of the Jisk sterile. 



Rays yellow. l>a|>pus uoue I'OLYMKIA. 



Rays yellow. l'api)us none. Aclieuia prickly . . ACANTHOSPEKMU.\I. 



Rays yellow. Pappus a toothed crown CHKVSOGUNUM. 



Rays yellow. P.ippus 12-toothed or awued. Achenia winged . . SlLl'HIUM. 

 Rays yellow. Pappus ".'-toothed or awned. Achenia wingless 1JEKLAXL)IKRA. 

 Rays yellow. Pappus 2 toothed. Achenia wingless . Ll.NDHElMEKIA. 



Rays yellow. Pappus of the rays none, of the disk dowers bristle-like scales. 



AMPHIACHYRIS. 



Rays wliite. Receptacle couical PARTHENIUM. 



Rays neutral (without pistils). 

 Receptacle naked or nearly so. 



Achenia villous. Pappus scaly, long-awned GAILLARDIA. 



Acheuia smooth or the angles hairy. Pappus awuless . . LLPTOPODA. 



Receptacle deeply pitted. 



Margins of the pits entire. Perennial BALDWINIA. 



Margins of the pits toothed. Ainmal ACTIN0SPER41UM. 



Receptacle chaffy throughout. 

 Involucre double. Pappus 2 - 4-awned. 



Awns of the pappus hispid upward COREOPSIS. 



Awns of the pappus hispid downward. Acheuia beakless . . BIDENS. 



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



Involucre simple or imbricate. 



Pappus a cup-shaped border. 



Chaff of the receptacle elongated, spine-pointed . . . ECHINACEA. 



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



Pappus none. Achenia not angled GYMXOLOMIA. 



Pappus 2 - 4-awned. 

 Achenia winged. Leaves divided. Receptacle elongated . LEPACHYS. 

 Achenia winged. Leaves undivided. Receptacle convex . ACTINOMERIS. 

 Achenia wingless. Awns of the pappus deciduous . . HELI.\N'THUS. 



Achenia wingless. Awns of the pappus persistent . HELI.\NTHELLA. 

 Receptacle chaffy at the apex. Achenia ribbed ANTHEMIS. 



ScBORDKR II. LABIATIFI/lK.E. Corolla of the perfect flowers 2- 

 lipped ; the outer lip 3-lohed, the inner 2 lobed. 

 Herb etemless. Scape l-flowered. Flower nodding .... CHAPTALIA. 87 



Suborder III. LIGULIFLOR^E, Corolla of all the flowers ligulate. 



Pappus none. Achenia many-ribbed .... 



Pappus scaly. Flowers blue 



Pappus scaly and bristly. 

 Scales of the pappus 5, with ii intermediate bristles 

 Scales of the pappus and bristles numerous 

 Pappus hairy. 

 Pappus tawny or dirty white. 

 Flowers erect, rose-color. Leaves filiform . 

 Flowers erect, yellow. Achenia beakless 

 Flowers erect, yellow. Adienia long-beaked 

 Flowers nodding, whitish or purplish 



APOGON. 

 CICHORIUM. 



KRIGIA. 

 CYNTHIA. 



. LYGODESMIA. 93 



. HIERACIUM. 91 



PYRRHO PAPPUS. 95 



. PRENANTHES. 92 



