Hi Ben,

I am glad to see someone mention osage orange trees. Ben, remember your
research for me in Clermont County,Ohio on the Osage Orange hedgerows.  When we
worked on that project, we found some good contemporary references by
horticulturalists and landscape designers such as John Aston Warder (American
Forestry Association), Andrew Jackson Downing, and others of the mid-nineteenth
century.  Publications of societies such as the American Forestry Association
and other nineteenth century horticultural societies may provide you with good
documentation for when some of the more exotic domesticates were introduced
and/or popularized, especially for the eastern US.

Here in the middle Ohio Valley, we see many of the same plants already
mentioned. A few to add include yucca for both domestic and more rarely
cemeteries, and several types of cedar trees for small cemeteries.   Myrtle
(vinca minor) is almost ubiquitous at the small family cemeteries in the
northern Kentucky/southwest Ohio area. Cedar trees were also very popular.  If
a combination of cedar, myrtle, and some type of bulb flower (day
lily/daffodil) are found together, you can be pretty certain you have a
cemetery.

Jeannine Kreinbrink