Rhoads, Ann Fowler. <br/><br/>
The vascular flora of Pennsylvania  annotated checklist and atla /s 
Ann Fowler Rhoads, William McKinley Klein ; illustrations by Janet E. Klein ; compiled and produced at the Morris Arboretum of the University of Pennsylvania with the assisstance of Alfred E. Schuyler and Carl S. Keener. 
 - Philadelphia :  American Philosophical Society,  1993. 
 - 636 p. :  ill. ;  29 cm. 
 - Memoirs series ;  v. 207. .
<br/><br/>p. 581-594. 
<br/><br/><label>ISBN: </label>0871692074  RM130.00 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany--United States--Pennsylvania.<br/>Botany--Classification.