COMPOSITE. (composite FAMILY.) 



185 



Achenia not ribbed, 5-angled. No. 



Receptacle conical CONOCLINTUM. 14 



Receptacle flat. Stems climbing. MIKAKIA. 13 



Receptacle flat. Stems erect EUFATORIUM. 12 



Pappus scaly. 

 Flowers blue or purple. 



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



Pappus slender, almost bristly. 



Pappus deciduous. Heads large and single STOEGSIA. 2 



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



Pappus of 6 oval almost bony scales. Leaves whorled. . . SCLEROLEFIS. 7 

 Flowers white. 

 Recept-acle naked. 



Leaves entire, linear or lanceolate , PALAFOXTA. 57 



Leaves entire, ovate or cordate AGERATUM. 6 



Leaves pinnately lobed IIYMENOPAPPUS. 58 



Receptacle chaffy. 



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



Achenium flat. Pappus 2-awned ACTINOMEBIS. 49 



Flowers yellow. Pappus ,2 - 4-awned. 



Awns of the pappus deciduous HELIANTHUS. 47 



Awns of the pappus persistent, hispid upward. .... COREOPSIS. 50 



Awns of the pappus persistent, hispid downward. BIDENS. 52 



* * Heads with flowers variously imperfect. 

 Marginal flowers pistillate. Central flowers perfect. 

 Pappus bristly. 



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



Scales of the involucre in 2 or more rows. 



Involucre persistent. Leaves sinuate-lobed. COKYZA. 26 



Involucre persistent. Leaves eatlre. Anthers tailed. . . PLUCHISA. 28 



Involucre persistent. Leaves entire Anthers tailless. . , GNAPHALIUM. 70 



Involucre deciduous. Heads spiked PTEROCAULON. 29 



Pappus not bristly, 5-lobed TANACETUM. 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 CENTAUREA. 77 



# * * Heads dicecious 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. . . . XANTHIUM. 37 



Staminate and pistillate beads on separate plants. 



Anthers tailed. Hoary herbs. ANTENNARIA. 71 



Anthers tailless. Smooth shrubs BACCHARIS. 27 



{ 2. Beads radiate. 

 Rays pistillate. 

 Flowers all fertile. 

 Receptacle naked. 

 Rays yellow. Leaves opposite. 



Pappus none FLAVERIA. 6S 



Pappus scaly PECTIS. i 



Rays yellow. Leaves alternate. 



Scales of the involucre In 1 row SENECIO. 74 



Scales of the Involucre in 2 rows IIELENIDM. 69 



Scales of the involucre In several rows. . . .... INULA. 25 



