171 



the Indiana Academy of Science, Vol. 11, page 142, and Vol. 12, page 299, I 

 have previously expressed the opinion that the species in question is 

 pagodcefolia. If this is true, this southern form came into our area along 

 the valley of the Mississippi, and a species which is a large and valuable 

 "timber tree in the river-swamps of the Yazoo basin, Mississippi, and of 

 Eastern Arkansas" might reasonably be expected in the low, wet bottom 

 lands of the lower Wabash Valley. The Indiana station represents the 

 northeastern limit of the species, a fact reflected in its sparing occurrence 

 and reduced size. Deam's collection of 1915 show the occurrence of this 

 species in Jefferson County. 



The Yellow Hackleberry (Geltis Mississippiensis Bosc.) is frequent or 

 common along streams and in the lowlands of Gibson, Knox and Posey 

 counties. It is a southern and western form, reaching a height of from 60 

 to 80 feet and a diameter of from 2 to 3 feet in the basin of the lower Ohio 

 River. In Indiana which represents its northern limit the tree "is inclined 

 to grow scrubby and crooked." (Deam.) It is medium sized, rarely 

 exceeding a diameter of 18 inches. Its occurrence within our area is 

 easily explained, since the counties named are not especially far removed 

 from the center of its maximum development both as to size and numbers. 

 It is a little difficult, however, to explain why it has not spread more widely 

 in the State. 



The Southern Thorn (Crataegus viridis Linnaeus) is distinctly southern 

 and somewhat western in its mass distribution, reaching its greatest abun- 

 dance and largest size in western Louisiana and eastern Texas. It is found 

 along stream borders and the margins of swamps in moist soils, doubtless 

 finding it way into our area when such conditions were practically con- 

 tinuous. 



The Shining Thorn (Cratcegus nitida (Eng.) Sargent) is said in Sar- 

 gent's "Trees of North America" to occur on the "bottoms of the Mississippi 

 River in Illinois opposite the city of St. Louis." The species occurs in rich 

 bottom lands in both Gibson and Posey counties in fair abundance as a 

 small tree, from 20 to 30 feet high and with a broad and handsome crown. 

 As a result of the recent work in the segregation of species in the genus 

 Crataegus it is practically impossible to form any definite notion as to the 

 range of any particular form. Much field work will be necessary before 

 we can determine just what species of this puzzling genus are members of 

 our flora. No opinion is expressed, therefore, regarding the source from 



"Sargent. Op. Cit. 245. 



