PLANTS OF IOWA 155 



1982. 8. alba, L. White Willow. 

 Introduced from Europe. 



1983. 8. alba vitellina, (L.) Koch. Golden Osier. 

 Frequent. 



1984. 8. cordata, Muhl. Heart Leaved Willow. 

 Common in wet places. 



1985. 8. missouriensis, Bebb. Missouri Willow. 

 In low ground, not rare. 



1986. 8. myrtilloides, L. Bog Willow. 

 Northern, rare. 



1987. 8. fluviatiUs, Nutt. Sandbar Willow. 

 Along streams. 



1989. 8. petiolaris, J. E. Smith. Slender Willow. 

 Low, wet ground. Frequent. 



1990. 8. discolor, Muhl. Glaucous Willow. 

 Banks of creeks, common. 



1991. 8. bebbiana, Sarg. Bebb's Willow. 

 Not common. 



1992. 8. humilis, Marsh. Prairie Willow. 

 Dry prairies, frequent. 



1993. 8. tristis, Ait. Dwarf Gray Willow. 

 Not common. 



1994. '8. Candida, Fluegge. Hoary Willow. 

 Not common. 



1995. 8. sericea, Marsh. Silky Willow. 

 Not common. 



JUGLANDACEJE. WALNUT FAMILY. 

 JUGLANS, L. 



1996. J. nigra, L. Black Walnut 

 Common in woods in rich ground. 



1997. J. cinerea, L. Butternut. 

 Woods, frequent. 



HICORIA, Raf . 



1998. H. pecan, (Marsh) Britton. Pecan. 

 Southeast in moist soil along streams. 



