OF SOME SPECIES AT THE EDGES OF THEIR RANGES 37 
or seven to a stalk—as to make the Ohio plants bearing rarely 
more than one-or two berries and those only on about one plant 
in ten, seem sterile by comparison. On the other hand some 
Fic. 5. Oxydendrum arboreum in fruit at Sugar Grove 
species flower sparingly throughout their range so that similar 
behavior at the termini would not be unusual. In making the 
tables I have classed as fruiting freely all those species whose seed 
production appeared adequate for their perpetuation. 
