198 PROCEEDINGS OF THE AMERICAN ACADEMY 



===== Leaves thinnish, puberulent, but greeu, broad, acute, 

 divergently tripliiierved and veiny, serrate: involucral bracts 

 narrowly oblong, obtuse : rays few. 



S. Drummondii, Torr. & Gray. Triplinerved, but most related to 

 such venose species as S. amplexicaulis and >S'. rugosa. 



***** CORYMBOSiE. 



-t- Leaves not triplinerved, flat ; cauline very numerous : akenes 



glabrous, 



++ Turgid, 10-15-nerved. 



S. RIGID A, L. 



S. CORYMBOSA, Ell., not Foil'., which is only S- Virgaurea. 



++ ++ Akenes barely 5-nerved. 



S. Ohioensis, Riddell. 



•J- H— Leaves somewhat conduplicate-carinate ; lower slightly 

 triplinerved. 



S. RiDDELLii, Frank in Riddell, Synops. S. amplexicaulis, Martens. 

 S. HouGiiTONi, Torr. & Gray, in Gray, Man., ed. 1, 21 L 



-t- -1- -I— Leaves flat, smooth and glabrous, narrow, somewhat 

 triplinerved or 3-nerved, lucid. 



S. NiTiDA, Torr. & Gray. Louisiana and Texas. 

 S. PUMILA, Torr. & Gray. Chrysoma pumila, Nutt. 



§ 2. EUTHAMIA. 

 * Western species, more paniculate. 



S. OCCIDENTALIS, Nutt. 



* * Eastern species ; fastigiate-cymose and glomerate. 



S. LANCEOLATA, L. 



S. TENUiFOLiA, Pursh. This proves to be the Erigeron CaruUnin- 

 num, L., that is, Virga-aurea Carol., &c.. Dill. Elth. 412, t. 306, 

 fig. 394. 



S. LEPTOCEPHALA, Torr. &, Gray. Louisiana and Texas. 



§ 3. CHRYSOMA. 

 S. PAUCiFLOSCULOSA, Michx. Chrysoma solidaginoides, Nutt. 



