PROCEEDINGS 



OF THE 



AMERICAN ACADEMY 



OF 



ARTS AND SCIENCES. 



VOL. XIX. 

 PAPERS READ BEFORE THE ACADEMY. 



I. 



CONTRIBUTIONS TO NORTH AMERICAN BOTANY. 



By Asa Gray. 



Presented May 9, 1883. — Issued Oct. 30, 1883. 



I. Characters of New Compositce, tviih Revisions of certain 

 Genera, and Critical Notes. 



Eupatoriacece. 



Stevia amabilis, Lemmon. S. laxiflorce peraffinis, gracilior, bi- 

 pedalis ; foliis omnibus linearibus basi attenuatis (sesquipollicaribus) 

 integerrimis ; capitulis effuso-paniculatis ; floribus laite purpureis ; 

 pappi paleis 5 cum aristis alteruantibus brevissimis. — S. Arizona 

 in the plains near Cave Cailon, Lemmon. The narrowest-leaved 

 forms referred to S. laxiflora (coll. WisUzenus, Schaffner) notably 

 approach this. 



Asteroidece. 

 Aplopappus (Ericameria) moxactis. Facie A. laricifolii, fru- 

 tex fastigiato-ramosissimus, 1-o-pedalis, vix resiuosus ; foliis aceroso- 

 linearibus fere impuuctatis ; capitulis corymboso-cymosis paucifloris ; 

 involucro oblongo 8-10-phyllo ; bracteis chartaceis oblougis vel 

 sublanceolatis obtusis ; floribus hermaphroditis 5 vel 6, corollje lobis 

 ovato-oblongis, styli ramis latiusculis appendice subovata acuta super- 

 atis ; foemineo unico (interdum nullo), ligula elougato-oblonga ; 

 acheniis sericeo-villosis ; pappo albo moUi. — Borders of the Mohave 



VOL. XIX. (n. S. XI.) 1 



