IOWA ACADEMY OF SCIENCES. 63 



Ostrya virginica Willd. Ironwood. Not uncommon along- 

 the Nodaway, and may be found on Middle river, but not 

 abundantly. 



('rat(egus coccuiea L. Hawthorn. White thorn. Red haw. 

 Common on low land, usually in larger timber. 



C. tomenhmi L. Black haw. Not very common. Found in 

 greater abundance on the west than on the east side of the 

 county. 



Pyrus coronaria L. Crab apple. Very common on all low 

 land, whether open or covered by larger timber. 



Corruis jKniicifhffa Lt'ller. Dogwood. Common in thickets, 

 both in valleys and on the higher land. 



Ehiis glabra L. Sumac. Common in thickets along the side 

 and crest of river bluffs and on the high prairie. Pound 

 usually with hazel and bur oak. 



Sambiictis canadensis L. Elderberry. Common in thickets 

 on all waste, rich land. Prefers the bottoms. 



Prunvs virginiana L. Chokecherry. Fairly common on all 

 low land. Usually found in hick ts of other timber. 



Corylus auiericana Walt. Hazel. Very common on all rough, 

 rolling land, especially near the larger streams. Very seldom 

 found on low land. Originally a great part of the prairie was 

 covered with hazel, but most of it has been removed. A good 

 deal yet remains, however, and all along the larger streams it 

 is very abundant. 



Salix nigra Marshall. Willow. Tolerably common on all 

 low, moist ground. 



Vitis cestivaUs L. Wild grape. Common in all timber. 



Lonicera parvijlora Lam. Not common. Found occasionally 

 in heavy thickets. 



EFFECTS OF A SLEET STORM ON TIMBER. 



BY JAMES E. GOW. 



On the nigQt of the 9th and the morning of the 10th of Feb- 

 ruary, 1898, a heavy sleet storm passed over Adair county, 

 Iowa. The storm began not very long after midnight w th a 

 brisk rain which froze as it fell and adhered tenaciously to 

 trees and other objects with which it came in contact. The 



