COMPOSITE. (COMPOSITE FAMILY.) 



185 



Achenia not ribbed, 5-angled. No. 



Receptacle conical CONOCLTNTUM. 14 



Receptacle flat. Stems climbing MI KAMA. 13 



Receptacle flat. Stems erect EUPATORIUM. 12 



Pappus scaly. 

 Flowers blue or purple. 



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



Pappus sleuder, almost bristly. 



Pappus deciduous. Heads large and single. STOKESIA. 2 



Pappus persistent. Heads small, in 3-bracted clusters. . ELEPHAN'TOPUS. 3 



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

 Flowers white. 

 Receptacle naked. 



Leaves entire, linear or lanceolate. PALAFOXIA. 57 



Leaves entire, ovate or cordate AGERATUM. 6 



Leaves pinnately lobed HYMEXOPAPPUS. 58 



Receptacle chaffy. 



Achenium top-shaped. Scales of the pappus 5 - 6. . . . MARSHALLIA. 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 entire. Anthers tailed. . . . PLUCHEA. 28 



Involucre. persistent. Leaves entire Anthers tailless. . . 6XAPHAl.lt M. 70 



Involucre deciduous. Heads spiked PXEROOAULONi 29 



Pappus not bristly, 5-lobed TANAOETOM. 67 



Pappus none ARTEMISIA. 68 



Marginal flowers pistillate. Central flowers staminate. 



Pappus none Style rigid, persistent. SOLIVA. 69 



Pappus none. Style deciduous. Heads nodding IVA. 35 



Marginal flowers neutral. Central flowers perfect. .... CEXTAUREA. 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. . . . XAXTHIUM. 37 



Staminate and pistillate heads on separate plants. 



Anthers tailed. Hoary herbs AXTEXXARIA. 71 



Anthers tailless. Smooth shrubs. BACCHARIS. 27 



§ 2. Heads radiate. 

 Rays pistillate. 

 Flowers all fertile. 

 Receptacle naked. 



Rays yellow. Leaves opposite. 



Pappus none FLAYERIA. 55 



Pappus scaly PECTIS. 4 



Rays yellow. Leaves alternate. 



Scales of the involucre in 1 row SENECIO. 74 



Scales of the involucre in 2 rows. HEI.F.MCM. 69 



Scales of the involucre in severa row INULA. 25 



