198 Rhodora [OCTOBER 
That this Prunus came from the west rather than from the south is 
most probable both from the general movement of stock for the 
Chicago market and from the hardiness of the shrub. If we refer it to 
the Chickasaw plum, we find the range of this considerably south of 
this latitude. It comes into the extreme southern part of Illinois, 
being credited to Union county by Vasey, and into the corresponding 
part of Indiana, being credited to Gibson county by Schneck. Both 
of these stations are near the Ohio river. In his catalogue of the 
flowering plants and ferns of Indiana, Stanley Coulter says under 
P. angustifolia: “Of rare occurrence in the southwestern counties of 
the state. It is reported as growing on dry, rather rocky slopes. I 
have seen no specimens and the species is admitted on the authority 
of collectors." ! Schneck for Gibson county is the only person cited. 
It is not given among the trees of Indiana by Chas. C. Deam in the 
Eleventh annual Report of the State Board of Forestry of Indiana 
(1911.) 
It does not seem to be hardy as far north as the south end of Lake 
Michigan or probably any farther north than the localities mentioned 
for these two states. Sargent says of it, “In eastern New England 
it is barely hardy, seldom flowering and never producing fruit.” ? 
But the Prunus at Dune Park appears as hardy as any indigenous 
member of our flora. All the circumstances tend to the conviction 
that it was introduced from the western plains, and that its apparently 
improved condition is due to a better environment than in its native 
region. 
CHICAGO, ILLINOIS. 
1 Report of the State Geologist, 1901, p. 794, 
2 The Silva of North America 4: 26, 1892. 
