168 SYNGENESIA, SUPERFLUA. 



calix is very short, flat, and horizontally spreading"; tlie 

 leaflets of the paleaceous pappus awned, and the seeds 

 villous; the leaves are also alternate and entire. The 

 proximate affinity of the present genus is lo Tagetes. 



569. BOLTONIA. Schrcbcr, 



Calix imbricated. Raijf; numerous. Becep- 

 fade conic, punctate. Seeds flat and marginat- 

 ed. Pappus consisting of many minute setse, 

 with 2 of them opposite and mostly elongated. 



Herbaceous; leaves entire; stems divaricately branched; 

 peduncles terminal, l-{^ov.-ered. Hays pale violet. 



Species. 1. B. glaHifoUa. The leaves when bruised 

 smell somethin,^ like Fennel. 2. asteroides. — The only 

 species of the genus. 



570. BELLIS. L, (Daisy.) 



Calix hemispiierical: leaflets equal. Seed ob- 

 ovate. Receptacle naked, conic. Pappus none. 



Leaves radical; scapes 1-flowered; rays white or pur- 

 ple. The caulescent species ought probably to be sepa- 

 rated. 



Species. 1. B. intcgrifolla. No botanist has yet col- 

 lected this plant since Michaux. Is it not an Eclipta ? 



571. CHRYSANTHEMUM. L. (Ox-eye.) 

 Calix hemispherical, imbricate; innermost 



scales scariose. JRcceptacIe naked. Pappus none. 



Stem simple or branched; leaves simple or pseudopin- 

 r.ate; flowers terminal, solitary or corymbose. 



Species. 1. C. l^eticaiithemnm. Introduced, and now 

 abupflantly naturalized in tJie middle states. 2. arcticum. 

 In >7orth California. 



.572. TYRETHRUM. Ga-viner, Smith. (Fever- 

 lew.) 



Calix hemi.'^ph.erira], imbricate, scales partly 

 acute, with scariose margins. Receptacle naked. 

 Pappus marginal. 



.Stem branched; leaves entire or pscudopinnate; pedun- 

 cles branc!ied, corymbose or solitary. 



Species. 1. 1\ serotinum. — An European genus. 



