470 



SYNGENESIA NECESSARIA 



Mich. 2. p. 146. Sp. pi. 3. p. 2332. Pursh, 2. p. 578. Nutt. 2. p 



183. 



S. Tomentosum, Pursh, 2. p. 579. 



Stem two to three feet high, erect and procumbent, terete, covered hke the 

 underside of the leaves with a white tomentum. Leaves oblong, acute, irre- 

 gularly toothed, conspicuously veined, the upper surface green, pubescent, 

 the uppermost simply ovate. Flowers few, in an irregular corymb. Scales 

 of the involucrum eight to ten, ovate, tomentose, imbricate. Florets of the 

 ray eight to ten, rarely exceeding an inch in length, pubescent on the outer 

 surface; of the disk numerous, dark purple. Seed obovate, crowned when 

 young with two deciduous setaceous awns. 



Grows in the high dry pine barrens in the middle country. 



flowers July — August. ' 



16. Elatum. Pursli. 



S. foliis alternis, pe- I Leaves 

 tiolatis^ cordatis, sinu- petiolate, cordate, sin- 

 atis; iiivolucri squamis uate; scales of the in- 



alternate, 



obtusis. 



volucrum obtuse. 



Pursh, 2. p. 579. 



Grows in Carolina. Pursh. 



17. Reticulatum. Pursh. 



S. 



foliis 



alternis, 



ovato-lanceolatis, cor- 

 datis, serratis, obtusi- 



Leaves 



alternate 



9 



ovate-lanceolate 

 date, serrate. 



? 



cor- 

 rather 



usculis, villosiusculis. | obtuse, slightly villous. 



Pursh, 2. p. 579. 



These two species with whicii I am unacffriainted, and which are very 

 imperfectly distinguishedj were described by Pursh from specimens in the 

 Herbarium of Sir Joseph Banks. They were probably collected by Bartrani 

 (to whom the Botanists of the last century were indebted for a knowledge* 

 of many of our plants) on the confines of Georgia, Florida, and Alabama, 

 the country of the HeUantlms, tlie Silphiura, the Rudbcckia, and perhaps 1 

 may add of the Solidago. 



