irO syifGENESIl. SUPERFLUA. 



America, extending- into the warmer parts of the United 

 States. Growing generally on the banks of rivers. 



575. SIEGESBECKL\. L, 



Exterior calix S-leaved, spreading, interior 

 many-leaved, pentangular subequal. Rays only 

 on one side of the flower. Receptucle paleace- 

 ous. Papjjus none. Seed partly 4-sided. 



Herbaceous; leaves opposite, asperate, somewhat 3- 

 nerved; flowers pedunculate, axillary and terminal. 



Species. 1. 8. lacwiafa. 2. fosculosa. North Califor- 

 nia A genus of 4 species, 1 mdigenous to India, 2 to 



America, and 1 to Iberia. 



576. PHAETHUSA. Gcertner. 



Calix imbricated. Rays I to 8. Receptacle 

 paleaceous. Seeds hispid. Tappus none. 



Herbaceous; leaves opposite, entire, 3-nerved, branches 

 corymbose. 



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



577. VERBESINA. L. 



Calix many-leaved, leaflets disposed in a 

 double series. Rays about 5. Receptacle pale- 

 aceous. Pappus 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. Siegesbeckia Leaves opposite. 



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

 nuately lacmiated, subpinnatifid, attenuated at either ex- 

 tremity, and acute; branches corymbose; flowers white; 

 ^cahx subimbricate; seeds immarginate. Hab. In South 

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

 ci/uatat of Lamark. 



A genus of 17 species, principally indigenous to India 

 and the warmer parts of America. The North \merican 

 species are nearly allied to Xime7i€sia<, in vhich the seeds 

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

 lix and numerous rays ef this plant serve a» iiDpoi*WPt 

 distinctions. 



