204 



COMl'OSlT.i:. (coMPOSITi: KA.MILV.) 



§ 1. Heads (liHooid. 

 • Heads with tlie fluwiTH all porfoct. Ho. 



Pappus none. Lpavos resinous-dotted, linear. Flowers yellow . . FLAVKRIA. CI) 

 Piip]ius none. Li-aves opposite, ovate. Flowers yellow . . VKKUESINA. 5t< 



TappuH mine. Leaves alt«ruate. Flowers wlute .... UARTWKIGHTIA. & 

 Pappus bristly or hairy. 

 Flowers yellow. 



Receptacle iiointeJ ISIGKLOVIA. 21 



Receptacle flat SOLIDAGO. 'ZU 



Receptacle convex BENECIO. 80 



Flowers white, blue, or purple. 

 Receptacle chatfy. 



Leaves opposite. Flowers white MKL.\NTHERA. 47 



Leaves alternate. Flowers purple CARPHKPHORUS. 7 



Receptacle bristly. 



Leaves spiny CNICU8. 84 



Leaves not spiny, cordate ARCTIUM. 85 



Receptacle naked. 



Scales of the involucre in a single row CACALIA. 83 



Scales of the involucre iu 2 or more rows. 



Pappus double, the outer row very short VERNONIA. 1 



Pappus single. 

 Achenia ribbed or striate. 



Pappusplunio.se. Flowers cream-colored KUHXIA. 11 



Pappus scabrous. Leaves cordate. Flowers purple . BRICKELLIA. 12 

 Papims scabrous. Leaves narrow. Heads raceiued . . . LIATRIS. 8 

 Pappus scabrous. Leaves oblong. Heads panicled . . TRILISIA. 9 

 Pappus scabrous. Leaves obovate. Stems woody . . GARBERIA. 10 

 Achenia not ribbed, iVangled. 



Receptacle conical CONOCLINIUM. 13 



Receptacle flat. Stems climbing MIKANIA. 14 



Receptacle flat. Stems erect EUPATORIUM. 13 



Pappus scaly. 

 Flowers blue or purple. 



Pappus a cup-shaped border of united scales AGERATUM. 4 



Pappus slender, almost bristly. 



Pappus deciduous. Heads large and single STOKESIA. 2 



Pappus persistent. Heads small, in 3-bracted clusters . ELEPH.4.XTOPUS. 3 



Pappus of .5 oval almost bony scales. Leaves whorled . . SCLEROLEPIS. 6 

 Flowers white. 



Receptacle naked. 



' [ POLYPTERIS. C7 



Leaves entire, linear or lanceolate \ p\L\poXIA C8 



Leaves entire, ovate or cordate AGKRATUM. 4 



Leaves pinnately lobed HYMENOPAPPUS. GC 



Receptacle chaffy. 



Acheniura top-shaped. Scales of the pappus 5 -6 . . . M.\RSHALL1A. C.5 



Acheniiim flat. Pappus 2-awned ACTINOMERIS. 59 



Flowers yellow. Pappus 2 - 4-awned. 



Awns of the pappus deciduous HELIANTHUS. 50 



Awns of the pappu.s persistent, hispid upward COREOPSIS. 60 



Awns of the pappus persistent, hispid downward BIDENS. C2 



* * Heads with flowers variously imperfect. 



Marginal flowers pistillate. Central flowers perfect, but abortive. 

 Pappus bristly. 

 Scales of the involucre in a single row ERECHTHITES. 82 



