Alleghanian—Ozark Distriet: Ozark Plateau. 513 
Pirus loensis, species of Crataegus and Prunus with such undershrubs as 
Symphoricarpos occidentalis and Corylus americana. 
In the open parts of these forests?) are Tricuspis (Sieglingia) sesleroides, Hellanthus tuberosus 
ı h eife onia 
var. ie Anemone pennsylvanica (= A. een Apocynum hyperic olium, Vern 
maxima, Solidago serotina, Aster missouriensis, Aster paniculatus and various species of Bidens. 
n the denser forest, various lianes are found Cissus SEEN (= Ampelopsis vor Vitis 
vulpina, Clematis Pitcheri, Rhus radicans, with such rare orchids that grow in the shade, viz: 
Aplectrum hiemale (= A. spicatum), Area plantaginea, Pogonia pendula (= P. trianthophora) 
and the saprophytic plant, Mnstone uniflor: 
The alluvial forest in Missouri, according to DANIELS, shows several well 
characterized faces. The Basswood (Tilia americana) Facies occurs on 
the flats of the streams. There enter into the composition of the facies: 
Fuglans cinerea, Carya, Ostrya, Ulmus, Celtis, Morus, Asımina, Platanus, 
Acer, Negundo and lianes. — The Swamp Oak Facies consists of Owercus 
palustris, O. platanoides, O. macrocarpa. The floor of these forests has the 
usual lowland vegetation, such as Arisaema dracontium, Claytonia virginica, 
Dentaria laciniata, Viola cucullata, Osmorrhisa longistylis, Mertensia virginica, 
Commelina nudıflora etc. 
West of a line drawn from the northeastern corner of Missouri to the 
southwestern corner, we find a flora which represents a transition from the 
forests of the Mississippi valley to the flora of the prairie regions lying west”). 
The flora shows the presence of Ouercus alba, O. macrocarpa, O. obtusiloba 
and here in the extreme limit of Frarinus quadrangulata, Carpinus americana, 
Alnus serrulata, Cornus florida. Here also Sassafras, Fuglans cinerea, Be- 
Lula nigra, Tecoma radıcans reach their western limits. 
We do not find Quercus alba, Q. bicolor (= Q. en Q. imbricaria, west of a line 
that er the western oo of Missouri. West of this line only three oaks remain, viz: 
r macrocarpa, Q. ru and (). palustris, a nigra, Platanus oceidentalis, Negundo 
ee = a ae, ae monilifera (= P. deltoides), Acer dasycarpum (= A. sacchari- 
num), Celtis occeidentalis, Ulmus va, Cercis canadensis, which occur in eastern Kansas in 
considerable bodies, but finally restrieted to the valleys preceding toward the vn where the 
d 
that begin to appear as features of the landscape in western Missouri. Wherever the limestone 
— the surface of the prairies in this neighborhood occur Desmanthus brachylobus, 
thus orgyalis. 
The Poren trees which border the prairies in eastern Missouri are chiefly Quercus alba, Q. 
stellata, Q. tinctoria, Q. Muhlenbergii and an occasional tree of Platanus oceidentalis. Between the 
forest and the prairie vegetation is found a thicket consisting of Rhus glabra, Sambucus canadensis, 
Euonymus ätropurpureus, Cereis canadensis, Rhamnus lanceolata, Pirus (Malus) coronaria, Cornus 
asperifolius, together with an en of Rosa arkansana, R. blanda, R. bumilis, Rubus 
canadensis, R. occidentalis, R. villos The lianes are Vitis riparia, Celastrus scndens, M BE 
spermum canadense, Smilax a s. herbacea, S. hispida and the poison ivy Rhus co- 
dendron. This thicket is fringed on the prairie side with low-growing shrubs (Ribes sr 
1) MACKENZIE, KENNETH K.: Manual of the Flora of Jackson County, Missouri. 1902. p. V. 
2) BROADHEAD, G. C.: Geographical Distribution of certain Trees and Plants in Missouri and 
Kansas. Kansas City Review of Science and Industry III: 608, 
Harshberger, Survey N.-America, f 33 
