220 JOURNAL OF THE ARNOLD ARBORETUM [vol. ii 



the southern species that characterize it are the Spanish Oak (Quercus 

 rubra L. formerly and naore commonly known as Quercus falcata Michx.). 

 Sweet Gum, Fringe-tree {Chionanfhus virginica L.), Red-flowered Buck- 

 eye {Aesculus discolor var. viollis Sarg.), Southern Linden {Tilia floridana 

 Small), Indian Cherry {Rhamnus caroliniana Walt.), French Mulberry 

 {C(dUcarpa americana L.), Dediduous Holly (Ilex decidua Walt.) and 

 Small Cane {Arundinaria viacrosperma Michx.). Some of these are 

 much commoner and more widely distributed tlian others; such species 

 as the Southern Linden, Indian Cherry and Deciduous Holly being found 

 almost throughout the region, while the Fringe-tree, Red-flowered Buck- 

 eye and French Mulberry are confined to the southern border. The 

 Sweet Gum extends up many of the river valleys for some distance into 

 the interior; it has been noted by the writer along White River and its 

 tributaries in Baxter and Marion Counties, Arkansas, and further west 

 in Boone and Newton Counties of the same state. Along the eastern 

 border of the region in Missouri it ascends the Mississippi River more 

 than half way to the mouth of the Missouri, and Is found generally in the 

 southeastern counties bordering the lowlands. Professor Shepherd 

 includes it in his list of trees of Greene County, Missouri, and if it is native 

 there it must be an isolated station. The Spanish Oak, which is so com- 

 mon in the lowlands of the Coastal plain has so worked its way up many 

 of the streams of the Ozark region. While in its southern home it is often 

 found growing in low, flat woods it has not taken to the low, alluvial 

 valleys here, but has established itself upon the dry, rocky ridges bordering 

 the streams. It has been found in such situations in Baxter and Marion 

 Counties, Arkansas, and in Wayne and Carter Counties, Missouri. 



The Cucumber-tree {Magnolia acuminata L.) is also confined to the 

 southern border of the Ozark region, where it is rather widely distributed 

 but nowhere common. It is knowTi to grow in Cape Girardeau, Barry and 

 Butler Counties, Missouri, near Cotter, Arkansas, and intheOuichita Moun- 

 tain area near Mena, Arkansas and Page, Oklahoma. It is found more 



abundantly in southern Illinois, along the southern border of the Shawnee 

 Hills, from which direction it appears to have entered the Ozarks. The 

 Broad-leaved Mock Orange (Fhiladclphus puhescens Schrad.). of similar 

 southeastern origin, is rarely found in the Boston Mountains, having been 

 collected by the writer in Newton and Marion Counties, Arkansas. The 

 occurrence of Ilalcsia moniicola var. vesiita Sarg. near Heber Springs, 

 Cleborne County, Arkansas, and of the even more southern Halesia 

 parviflora far to the west in the Ouichita Mountains of southeastern 

 Oklahoma is very interesting, these stations being quite remote from the 

 previously known range of these species. 



A general survey of this southern portion of the Ozark region discovers 

 a country for the most part heavily forested, with a few prairie openings, 

 usually of quite limited extent, commonest toward the western side, and 

 in the more eroded parts broken by numy small rocky barrens, upon 

 which only a stunted and scattered growth of trees and shrubs has been 



