COMPOSITE. (COMPOSITE FAMILY.) 



185 



Achenia not ribbed, 5-angled. No. 



Receptacle conical CONOCLTNTUM. 14 



Receptacle flat. Stems climbing. MIKANIA. 13 



Receptacle flat. Stems erect EUPATOBIDM. 12 



Pappus scaly. 



Flowers blue or purple. 



Pappus a cup-shaped border of united scales C03LESTLXA. 5 



Pappus slender, almost bristly. 



Pappus deciduous. Heads large and single STOKES1A. 2 



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



Pappus of 5 oval almost bony scales. Leaves whorled. . . SCLEROLEPIS. 7 

 Flowers white. 

 Receptacle naked. 



Leaves entire, linear or lanceolate PALAFOXTA. 57 



Leaves entire, ovate or cordate AGERATUM. 6 



Leaves pinnately lobed HYMEXOPAPPUS. 58 



Receptacle ebaffy. 



Achenium top-shaped. Scales of the pappus 5 - 6. . . . MARSIIALLIA. 63 



Achenium flat. Pappus 2-awned ACTIXOMERIS. 49 



Flowers yellow. Pappus 2 - 4-awned. 



Awns of the pappus deciduous IIELIAXTHUS. 47 



Awns of the pappus persistent, hispid upward COREOPSIS 50 



Awns of the pappus persistent, hispid downward BIDEXS. 52 



* * Heads with flowers variously imperfect. 

 Marginal flowers pistillate. Central flowers perfect. 

 Pappus bristly. 



Scales of the involucre in a single row. ERECIITHITES. 72 



Scales of the involucre in 2 or more rows. 



Involucre persistent. Leaves sinuate-lobed. COXYZA. 26 



Involucre persistent. Leaves eutire. Anthers tailed. . . . PLUCHEA. 28 



Involucre persistent. Leaves entire Anthers tailless. . . GXAPHALIUM. 70 



Involucre deciduous. Heads spiked PTEROCAULOX. 29 



Pappus not bristly, 5-lobed TANACETUM. 67 



.Pappus none ARTEMISIA. 68 



Marginal flowers pistillate. Central flowers staminate. 



Pappus none. Style rigid, persistent. SOLIYA. 69 



Pappus none. Style deciduous. Heads nodding IVA. 35 



Marginal flowers neutral. Central flowers perfect. .... CEXTADREA. 77 



* * * Heads dioecious cr monoecious. 



Staminate and pistillate heads on the same plant. 



Fruiting involucre 1-seeded, naked or tubercled AMBROSIA. 83 



Fruiting involucre 2-seeded, armed with hooked spines. . . . XANTH1UM. 37 



Staminate and pistillate heads on separate plants. 



Anthers tailed. Hoary herbs AXTEXXARIA. 71 



Anthers tailless. Smooth shrubs BACCHARIS. 27 



§ 2. Heads radiate. 

 Rajs pistillate 

 Flowers all fertile. 

 Receptacle naked. 



Rays yellow. Leaves opposite. 



Pappus none FLAYERIA. 55 



Pappus scaly PECTUS. 4 



Rays yellow. Leaves alternate. 



of the involucre in 1 row BENECIO. 7i 



Scales of tbe involucre in 2 rows. IIELEXIUM. 59 



Scales of the involucre in severa rows INULA. 25 





