Chemical and Physical Papers. 75 



In passing up the creek valleys, one meets another shrub, Primus 

 virginiana L. Rosa arkansana and Amorpha canescens are more 

 properly prairie plants, but invade the forest belt to some extent. 

 All of these shrubs are found in the creek valleys to nearly the 

 upper limit of tree growth, except Cephalanthus Prunus loatsoni, 

 and Euonymus. 



Smilax hispida Muhl. 

 Clematis missouriensis Rydb. 

 Menispermum canadense L. 

 Rhus radicans L. 



Celastrus scandens L. 

 Vitis vulpina L. 



Parthenacissus quinquefolia (L.) 

 Planch. 



Along Mulberry creek the continuous forest belt ceases about 

 five miles west of its mouth, while the discontinuous belts extend 

 about four miles farther. In passing up the creek valley the five 

 typical trees are box-elder, Green ash. White elm. Honey-locust, 

 and hackberry. Along these are occasional cotton woods. Peach-leaf 

 willows, or Red mulberries. The Green ash is the first to disap- 

 pear, usually several miles before the discontinuous forest belt 

 ceases. The remaining four species extend to the limit of tree 

 growth, with an occasional cottonwood or Peach-leaf willow. Half 

 a mile beyond the river belt not an individual, young or old, was 

 seen of the following species : Black walnut. Slippery elm, redbud 

 and coffee-bean. Near the upper limits of the creek the banks are 

 lined with Amorpha fruticosa and occasional clumps of Peach-leaf 

 willows. The Poison ivy is the most aggressive of the lianas and 

 extends to the very limits of shrubs and tree growth. 



The conditions on Five Creeks are practically the same. North 

 creek, which is a prominent tributary, extends through the southern 

 part of Bloom township. The Green ash is the least progressive up 

 stream of the five typical trees. As one passes near the limits of 

 the continuous forest belt the box-elder is the most abundant, with 

 White elm. Honey-locust, hackberry. Peach-leaf willow, and cot- 

 tonwood, in about the order named. The shrubs and lianas are 

 similar to those on Mulberry creek. At the upper end of the creek, 

 most of the woody plants are on the steep grassless bluffs, especially 

 on those facing the north. At the mouth of the Five Creeks, which 

 is on the border of the limestone region, the following trees are 

 present : 



Salix amygdaloides Anders. 

 Populus deltoides Marsh. 

 Juglans nigra L. 

 Ulmus americana L. 

 Ulmus fulva Mx. 

 Celtis occidentalis Mx. 



Morus rubra L. 

 Gleditschia triacanthos L. 

 Gymocladus dioica (L.) Koch. 

 Acer negundo L. 

 Fraxinus lanceolata Borak. 

 Quercus macrocarpa Mx. 



