THE SCIENTIST. 
1G3 
shellbark ( C. albcf) and the bitternut 
((7. amara) are common nortb, but 
not south; the rough shellbark (CI 
tomentosa) is common south of the 
line, but not north. 
Of those that are common north 
of the line and not so south are the 
following species: 
Red elm {Ulmvs fulra). 
White elm {U. Amencand). 
Button wood (Platanus ocndentalis) . 
Box-elder {Negundo aceroide-s) , 
Bough-leaved dogwood [Cornus asperi- 
folia). 
Prickly ash {Xanthoxylum AmericmHi). 
Linden {Tilia Americana). 
Walnut {Jvglans nigra). 
Black cherry [Prunns serotina). 
Climbing bittersweet {Celastrus scan- 
dens) . 
Red haw [Crataegus suhvillosa) . 
Burning bush {Enonymus airopii7'pu- 
reus). 
Virginian creeper {Ampelopsis quinque- 
folia). 
Buckeye {Aesculus glabra). 
Bladdernut tree {Staj)hylea trifolia). 
Black sugar maple {Acer saccharinum 
"ear. nigrum). 
Silver maple { A. dasycarpum). 
Redbud {Cercis Canadensis). 
Coffee tree ( Cymnoeladus Canadensis) . 
Honey locust {Gleditschia triacanthos) . 
Elder {Sambucus Canadensis). 
Hop tree (Osirya Virginica). 
Cottonwood {Popul'us monilifera). 
The species that are common south 
and uncommon north are the follow- 
ing: 
Wild plum [Prumis Americana) . 
Cockspur thorn {Crataegus Crus-galli). 
False indigo {Amorpha fruticosa). 
Crab apple {Pyrus coronaria) . 
Sheepberry ( Viburnum Lentago). 
Kinnikinick {Cornus sericea). 
The following are common south 
and very rare north of the line: 
Red cedar {Juniper us Virginiana), 
Panicled dogwood {Cornus paniculata). 
New Jersey tea ( Ceanothus Americanus). 
Red root {Ceanothus oralis). 
Lead plant {Amorpha canescens). 
Red haw {Crataegus tomentosa) . 
The following. species are common 
north, and are rare, or do not occur 
at all south: 
Rock elm ( Ulmus racemosa). 
Ninebark {Physocarpus opulifolius) . 
Serviceberry [Amelanchier Canadensis). 
Honeysuckle {Lonicera parvijlora). 
Buttonbush {Cephalanthus Occident alis). 
That herbaceous species are more 
or less restricted by this difference 
of forest growth there is no doubt, 
as there is a distinct prairie flora that 
comes well up to the line, and in a 
few cases overlapping the river flora, 
and a river flora which extends from 
the Missouri south to the line, and 
beyond it along the valleys of the 
tw^o Blues. But with the excejjtion 
of the plants which follow the val- 
leys of Little and Big Blue, there 
may be said to be two clearly deflned 
areas of plant life in Jackson coun- 
ty, one of which is influenced more 
or less by the humidity of the adja- 
cent river, and therefore is heavily 
wooded and includes all those plants 
which inhabit rich woods and low 
sandy bottoms; the other is affected 
by the dry winds from oft" the prairies 
to the south and southwest and con- 
sists of oak mottes, barrens and 
strips of prairies and inhabited 
mostly by prairie plants. 
