irO SYNGENESIi.. STTPERrLXJA. 



America, extending into the warmer parts of the United 

 States. Growing generally on the banks of rivers. 



575. SIEGESBECKIA. L. 



Exterior calix 5-Ieaved, spreading, interior 

 many-leaved, pentangular subeq ual. ^i2G//s only 

 on one side of the flower. Receptacle paleace- 

 ous. Fuppus none. Seed pai'tly 4-sided. 



Herbaceous; leaves opposite, asperate, somewhat 3- 

 nerved; flowers pedunculute, axillary and terminal. 



Species. 1. ^. laciniata. 2. fosculosa. North Califor- 

 nia. — A genus of 4 species, 1 indigenous to India, 2 to 

 America, and 1 to Iberia. 



576. PHAETHLSA. Gcertner. 



CnlLr imbricated. Bays 1 to 3. Receptacle 

 paleaceous. Seeds hispid. Pajjjms none. 



Herbaceous; leaves opposite, entire, S-nerved, branches 

 corymbose. 



Species. 1. P. amencana. -\-. A very doubtful plant. 



577. VERBESINA. L, 



Calix many-leaved, leaflets disposed in a 

 double series. Rays about 5. Receptacle pale- 

 aceous. Papjms 2-awned. 



Herbaceous or shrubby; leaves more or less scabrous, 

 alternate or opposite; flowers axillary or terminal and co- 

 rymbose. 



Species. 1. V. virginica. Flowers white; stem naked. 

 2. Siegesbeekia, Leaves opposite. 



3. * laciniata. Stem grooved, naked; leaves sessile, si- 

 nuately lacuiiated, subpinnatifid, attenuated at either ex- 

 tremity, and acute; branches corymbose; flowers white; 

 calix subimbricaie; seeds immarginate. Hab. In South 

 Carolina, v. s. In Herb. Muhl. Perhaps Siegesbeekia la- 

 ciniata, of Lam ark. 



A genus of 17 species, principally indigenous to India 

 and tiie warmer parts of America. The North American 

 species are nearly allied to Ximenesia, in which the seeds 

 of the disk are also flat and minutely bisetose, but the ca- 

 lix and numerous rays of this plant serve as important 

 distinctions. 



