A Flora of North West America  Thomas Howell. 

 - Hirschberggerm  J. Cramer  1977 
 - 792p. 
 - (Rep. of US-Floras v. 9). .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany Plants - North West America. 
<br/><br/><label>Dewey Class. No.: </label>581.97  / F59FF