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IOWA ACADEMY OF SCIENCES. 
Maclura aurantiaca Nutt. Osage Orange. Introduced; 
used for hedges. 
Morns rubra L. Red Mulberry. Thickets; not common. 
Urtica gracilis Ait. Nettle. River banks and fences; 
common. 
Boekmeria cylindrica Willd. False Nettle. Moist woods; 
frequent. 
PlatanacetE. Plane-tree Family. 
Platanus occidentalis L. Sycamore. Buttonwood. Along 
streams; not common. 
JuGLANDACEiE. Walnut Family. 
Juglans cinerea L. Butternut. White Walnut. Rich 
river bottoms; frequent. 
J . nigra L. B.ack walnut. River bottoms; common. 
Large trees have all been cut. 
Carya alba Nutt. Shellbark or Shagbark Hickory. 
Common on upland. 
C. amara Nutt. Bitternut Hickory. Rich woods; com- 
mon. 
f C. porcina Nutt. Pignut Hickory. Dry hills and up- 
lands; frequent. 
Cupuliferje. Oak Family. 
Cory lies americana Walt. Wild Hazlenut. Thickets, 
outskirts of timber and prairies; common. 
Ostrya virginica Willd. American Hop-Hornbeam. Iron- 
wood. Steep hillsides; common. 
Qnercus alba L. White Oak. Common on hills. 
Q. macrocarpa Michx. Burr Oak. Over cup or Mossy - 
cup Oak. Bottoms and hills; common. 
Q. muhlenbergii Engelm. Yellow Oak. Chestnut Oak. 
Not common. 
Q. rubra L. Red Oak. Hills; common. 
Q. coccinea Wang. Scarlet Oak. Upland woods. Com- 
mon. 
Q. coccinea Wang. var. tindoria Gray. Black Oak. 
Upland. 
Q. prinoides Willd. Prairies and upland woods; common 
