46 
IOWA ACADEMY OP SCIENCES. 
Q. BREviFOLiA (Lam.) Sargent. Bottoms. Rare. 
Magnolia fietida (Linn.) Sargent. Bull Bay. Swamps 
and bottoms. Common. 
M. GLAUCA Linn. Siveet Bay. Bottoms. Very common. 
Sassafras sassafras (Linn.) Karst. Sassafras. Bot- 
toms. Rare 
Liquidambar styraciflua Linn. Siveet Gum. Swamps 
and bottoms. Very common. 
Cercis canadensis Linn. Redbud. Clearings in hard- 
wood bottom lands. 
Xanthoxylum clava-herculis Linn. Prickly Ash. Bot- 
toms. Common. 
Ilex opaca Ait. Holly. Bottoms. Very common. 
CoRNus FLORIDA Liiin. Dogwood. Bottoms. Rare. 
Nyssa sYLVATiCA Marsh. Black Gum. Swamps and bot- 
toms. Very common. 
Nyssa aquatica Linn. Tupelo Gum. Swamps only. 
Very common. Noticeable for the very marked taper of 
its trunk in the first ten feet. This peculiarity distin- 
guishes all the species growing in the swamps, but is 
especially noticeable in the Tupelo. 
Fraxinus AMERICANA Linn. White Ash. Bottoms. Not 
common. 
Fraxinus lanceolata Borkh. Green Ash. Bottoms. 
Not common.’ 
F. Caroliniana Mill. Water Ash. Swamps. Common. 
Ulmus alata Michx. Wing Elm. Swamps. Rare. 
Celtis OCCIDENT alis Linn. Hackberry. Bottoms. Not 
common. 
Sambucus canadensis Linn. Elderberry. Bottoms. 
Not common. 
Smilax renifolia Small. Greenbriar. Swamps. Very 
common, in places forming thickets that are absolutely 
impenetrable. 
Rubus cuneifolius Pursh. Blackberry. Forms dense, 
often impenetrable, thickets in bottoms. Common also in 
old clearings. 
R. NiGROBACCUS Bailey. Blackberry. Common in bot- 
toms and all clearings. 
