COMPOSITE. (composite FAMILY.) 



185 



Aehenla not ribbed, 5-angIed. No. 



Receptacle conical CONOCLINTUM. 14 



Kecepticle flat. Stems climbing. MIKANIA. 13 



Receptacle flat. Stems erect EOPATOKIUM. 12 



Pappus scaly. 

 Flowers blue or purple. 



Pappus a cup-shaped border of united scales C(ELESTINA. 6 



Pappu-t slender, almost bristly. 



Pappus deciduous. Heads large and single STOKESIA. 2 



Pappus persistent. Heads small, in 3-bracted clusters. . ELEPHANTOPDS. 3 



Pappus of 5 oral almost bony scales. Leaves whorled. . . SCLEKOLEPIS. 7 

 Flowers white. 

 Receptacle naked. 



Leaves entire, linear or lanceolate. PAL.'V.FOXTA. 57 



Leaves entire, ovate or cordate AGERATUM. 6 



Leaves pinnately lobed IIYMENOPAPPUS. 58 



Receptacle chalTy. 



Acheuium top-shaped. Scales of the pappus 5 - 6. . . . M.4RSIIALLIA. 63 



Achenium flat. Pappus 2-awned. ACTINOMERIS. 49 



Flowers yellow. Pappus 2 - 4-awned. 



Awns of the pappus deciduous IIELIANTHUS. 47 



Awns of the pappus persistent, hispid uji ward C0RE0PSI3 50 



Awns of the pappus persistent, hispid downward EIDENS. 52 



* « Heads with flowers variously imperfect 

 Marginal flowers pistillate. Central flowers perfect. 

 Pappus bristly. 



Scales of tue involucre in a siugle row. ERECHTHITES. 72 



Scales of the involucre in 2 or more rows. 



Involucre persistent. Leiives siuuare-lobed. CONYZA. 26 



Involucre iiersistent. Leaves entire. Anthers tailed. . . . PLUCIIEA. 28 



Involucre persisteut. Leaves entire Anthers tailless. . . GNAPHALIUM. 70 



Involucre deciduous. Htiids spiked PTEROCAULON. 29 



Pappus not bri.-;tly, 5-lobed TANACETUJI. 67 



Pappus none ARTEMISIA. 68 



Marginal flowers pistillate. Central flowers staminate. 



Pappus uone. Style rigid, persistent. SOLITA. 69 



Pappus none. Style deciduous. Heads nodding IVA. 35 



Marginal flowers neutral. Central flowers perfect. .... CENTAUREA. 77 



« * * Heads dioecious or monoecious. 



Staminate and pistillate heads on the same plant. 



Fruiting involucre 1-seeded, naked or tubercled AMBROSIA. 36 



Fruiting involucre 2-seeded, armed with hooked spines. . . , XANTIIIUM. 37 



Staminate and pistillate heads on separate plants. 



.\nthers tailed. Hoary herbs ANTENNARIA. 71 



Anthers tailless. Smooth shrubs BACCHARIS. 27 



i 2. Heads radiate. 

 Rays pistillate. 



Flowers all fertile. 

 Receptacle naked. 

 Rays yellow. Leaves opposite. 



Pappus none FLAVERIA. 56 



Pappus scaly PECTIS. 4 



Rays yellow. Leaves alternate. 

 Scales of the involucre in 1 row. ....... SENEi^TO. 74 



Scales of the involucre in 2 rows. HELENIUM. 59 



Scales of the involucre in several rows INULA. 25 



