Griccs: THE SUGAR GROVE FLORA 491 
In Ohio, however, the reverse is the case; most of 
east to west. 
As one examines the 
the termini run in north and south lines. 
card catalog he soon finds several types of distribution that are of 
frequent occurrence. By far the most common of these covers 
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Fic. 2. Range of Oxydendrum arboreum in Ohio. 
the northeastern quarter of the state extending south to the present 
area along the lines of Merriam’s map. This may be illustrated 
by the distribution of Lycopodium in Ohio (FIG. 1). Almost as 
conspicuous is a second group which extends north from the Ohio 
River and occupies a triangular area with its apex at Sugar Grove. 
The sorrel-tree, Oxydendrum arboreum, is a oe example (FIG. 2). 
