48 
IOWA ACADEMY OF SCIENCE 
POPULUS (Tourn) L. 
279. Populus alba L. White Poplar. Cultivated. 
280. Populus tremuloides Miehx. American Aspen. Quite common in 
sandy woodlands. 
281. Populus grandidentata Miehx. Large Toothed Aspen. Very com- 
mon in woodlands. 
282. Populus deltoides Marsh. Cottonwood. Very common especially 
along streams. 
JUGLANDACEAE. 
JUGLANS L. 
283. Juglans cinerea L. Butternut. Not scarce in woods. 
284. Juglans nigra L. Black Walnut. Not scarce in woods. 
CARYA Nutt. 
285. Cary a ovata (Mill) K. Koch. Shell Bark Hickory. Common in 
woods. 
286. Carya alba (L.) K. Koch. White Heart Hickory. Not scarce. 
287. Carya microcarpa Nutt. Small Fruited Hickory. Rare in deep 
woods; State Quarries. 
288. Carya glabra (Mill) Spach. Pignut. Not uncommon in lowland 
woods. 
289. Carya cordiformis (Wang) K. Koch. Bitternut or Swamp Hick- 
ory. Rare. 
BETULACEAE. 
CORYLUS (Tourn) L. 
290. Corylus americana Walt. Hazelnut. Very common in woods and 
thickets. 
OSTRYA (Mich) Scop. 
291. Ostrya virginiana (Mill) K. Koch. Iron Wood or Hop Hornbeam. 
Common in woods. 
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CARPINUS (Tourn) L. 
292. Carpinus caroliniana Walt. Blue Beech. Rather scarce on wooded 
hillsides. 
