iana lists all of sixteen hickory species
and sub-species as appearing in The Flora of Indiana, a book by Mr.
Charles Deam, former State Forester. The list follows.

1. _C. pecan_

2. _C. cordiformis_

3. _C. ovata_

3a. _C. ovata_, var, _fraxinifolia_

3b. _C. ovata_, var. _nuttali_

4. _C. laciniosa_

5. _C. tomentosa (alba)_

5a. _C. tomentosa_ var. _subcoriacea_

6. _C. glabra_

6a. _C. glabra_ var. _megacarpa_

7. _C. ovalis_

7a, b, c. _C. ovalis_ var. _odorata_

7d. _C. ovalis_ var. _obovalis_

7e. _C. ovalis_ var. _obcordata_

8. _C. ovalis_ var. _pallida_

9. _C. ovalis_ var. _buckleyi_

Doubtless many sub-species and variants are actually hybrids of obscure
ancestry. Virginia has many such.

There is no reason to doubt that the hickories will grow anywhere
ecological conditions approximate those of their native habitat. This is
true in the Pacific coast states. Mr. Julio Grandjean, of Hillerod,
Denmark, reports that there are several white hickories, _C. alba_ or
_C. tomentosa_, growing in the Horsholm Royal Park that were planted
about 1790. There is no reason to believe that such northern species as
the shellbark and shagbark would not also succeed. He reports
winter-killing of pecans from southern sources. Inasmuch as extreme
winter temperatures in Denmark are less than in some places where the
pecan is grown here, it would appear that the more northern strains
should succeed there, though lack of summer heat would prevent the
maturing of nuts.

There appears to be much less interest in planting hickories on home
grounds than the value of the species justifies. Only five states,
Indiana, Ohio, Michigan, Pennsylvania and West Virginia, indicated any
local interest. In each case the shagbark was the preferred species.
Apparently we must still depend on the much-abused squirrel for the
future of the hickory.

R. E. Hodgson of the Southeast Experiment Station, Waseca, Minn.,
reports 15 named varieties of hickory under test, but no evaluation of
their worth can be made as yet.

Dr. R. T. Dunstan of Greensboro, North Carolina, has also a considerable
number of hickory varieties under more advanced test. Results have been
highly variable. He finds that Schinnerling has filled poorly; Whitney
and Shaul are "Excellent growers and highly satisf