COMPOSITA. (COMPOSITE FAMILY.) 185 
Achenia not ribbed, 5-angled. No. 
g Receptacle conical. . . . Soc 6 o u . OONODLINIDN M 
Receptacle flat. Stems climbing. V 7. 7 .- ^ ali a MBERNIA 18 
Receptacle flat. Stemserect. .  . H s * ^^ EUPATORIUM. 12 
Pappus scaly. 
Flowers blue or purple. 
Pappus a cup-shaped border of united scales. . : y š CŒLESTINA. 5 
Pappus slender, almost bristly. 
Pappus deciduous. Heads large and single. » : z x . STOKESIA. 2 
Pappus persistent. Heads small, in 3-bracted clusters. - -^ELEPHANTOPUS. 3 
Pappus of 5 oval almost bony scales. Leaves whorled. . M SCLEROLEPIS. 7 
Flowers white. 
Receptacle naked. ‘ 
Leaves entire, linear or lanceolate. "PUT š aG * ^ PALAFOXIA. 57 
Leaves entire, ovate or cordate. . . . " . á + .» AGERATUM. 6 
Leaves pinnately lobed. . . . . . .,. . . HYMENOPAPPUS. 58 
Receptacle chaffy. 
Achenium top-shaped. Scales of the pappus§-6.. . . MARSHALLIA. 68 
Achenium flat. Pappus 2-awned. + Ser iy v. v ARENOMBERIS 40 
Flowers yellow. Pappus 2 -4-awned. 2 
Awns of the pappus deciduous. . > . ‘ . 5 s HELIANTHUS. 47 
Awns of the pappus persistent, hispid upward. $ * $ y COREOPSIS. 50 
Awns of the pappus persistent, hispid downward. i > $ . . BIDENS. 52 
* * Heads with flowers variously imperfect. 
Marginal flowers pistillate. Central flowers perfect. oe FA 
Pappus bristly. ; 
Scales of the involucre in a single row. — . ^. ^. . .  ERECHTHITES. 72 
Scales of the involucre in 2 or more rows. 
Involucre persistent. Leaves sinuate-lobed. os oe eg) DONIRA UB 
Involuere persistent. Leaves entire. Anthers tailed. . . . PLUCHEA, 28 
Involucre persistent. Leaves entire. Anthers tailles, . - GNAPHALIUM. 70 
Inyolucre deciduous. Heads spiked. a à js * ^ PTEROCAULON. 929 
Pappus not bristly, 5-lobed. . . . . . * E A TANACETUM. 67 
T T — a Un A . ARTEMISIA. 68 
Marginal flowers pistillate. Central flowers staminate. 
Pappus none. Style rigid, persistent. iw 0 ae ipid uua SOLIVA. 69 
Pappus none. Style deciduous. Heads nodding. . . . . . , IVA. 85 
flowers neutral. Central flowers perfect. ece + “> ORTAR 19 
* * * Heads dicecious or moncecious. 
Btaminate and pistillate heads on the same plant. wA 
Fruiting involucre 1-seeded, naked ortubercled. . . . . . AMBROSIA. 36 
Fruiting involucre 2-seeded, armed with hooked spines. . . XANTHIUM. 37 
and pistillate heads on separate plants. i dioi T 
Anthers tailed. Hoary herbs. . . . . . +. +. .  ANTENNARIA. 71 
27 
-Anthers tailless. Smooth shrubs.. . . o aay eh sua cue OBAR. 
Ns $2. Heads radiate. 
Flowers all fertile. 
Receptacle naked. e 
Rays yellow. Leaves opposite. 
Pappus 
