173 
“low, wet river banks and swamps” suggest the same reasons for its occur- 
rence in the Indiana flora as has been suggested for the preceding species. 
Hardy Catalpa (Catalpa speciosa Warder) is a tree of the borders of 
streams and ponds and of fertile often flooded bottom lands. According to 
Sargent it is probably found in its greatest abundance and of the largest 
size in southern Illinois and Indiana, extending to western Kentucky and 
Tennessee, southeastern Missouri and northeastern Arkansas. In Indiana 
it is confined to Knox, Gibson, Posey and Vigo counties as a member of the 
original forests. Its occurrence in other counties is due to its widespread 
cultivation for post material or for ornamental purposes. Deam says,® ‘In 
Indiana it was found along the valley of the Ohio River as far east as 
Rockport and in the valley of the Wabash as far north as Vigo County. 
The mass of its distribution was west of a line connecting Terre Haute and 
Rockport.” The citations given are, however, all that can be considered as 
verified. In the catalpa we evidently have another case in which the dis- 
tribution is easily explained if it is related to a northward extension of the 
Gulf or to a condition of flooded rivers. 
The Swell-butt Ash (Frarinus Michawrii Britton) usually grows in 
low grounds which are inundated for several months during the year. . As 
its common name indicates the swollen base is characteristic of this species. 
It has been collected in Gibson, Posey and Marion counties by C. C. Deam. 
The Gibson and Posey County stations represent normal conditions for the 
species; the Marion County collection is in different case. The tree, which 
was of medium size, was growing in moist soil by the roadside. The known 
care and accuracy of Mr. Deam preclude any doubt as to the determina- 
tion, so that the occurrence of the species in this station must be referred 
to some accidental means of transportation or to what is perhaps more 
probable, the incorrect labelling of material furnished by some nursery for 
roadside planting. As a component member of our native forests the 
species is undoubtedly confined to Gibson and Posey counties. As this is 
a species but recently segregated its distribution is not yet thoroughly 
known. It, however, is known to range from New York to North Carolina 
and Louisiana and west to Missouri. 
This is very evidently another case of a species of coastal distribution 
with a seeming extension well into the interior. 
If we summarize these thirteen species, peculiar to our southwestern 
counties we find them all to be swamp forms or those growing in bottom 
8Deam. Op. Cit. pg. 347. 
