Synonyms.
Juglans oblonga alba, Marshall.
Juglans cathartica, Michaux.
Carya cathartica, Barton, 1818.
Wallia cinerea, Alefeld, 1861.
Varieties of the Butternut.—There are to be found many varieties of the butternut, varying mainly in the size of the nuts, and only slightly in the thickness of the shell; but I am not aware that any of these have ever been propagated, all the trees in cultivation or elsewhere having been grown from the nuts. This nut is, no doubt, susceptible of great improvement, as well as others of the genus, and it is worthy of being experimented with for that purpose, especially in cold, northern climates, where there are few or no other kinds of edible nuts. Probably the most direct and surest way to secure improved varieties is by hybridizing, taking the butternut for the female parent, and the Persian walnut for the male. Hybrids between these two species are already known, and they will, no doubt, become more plentiful as soon as skillful horticulturists are encouraged to produce them. Several hybrid walnuts of other species are figured and described by European horticulturists, but, so far as known, they are mainly accidental productions, and not the result of any direct effort of man; nature, in this instance, merely giving a hint of the possible, leaving us to avail ourselves of the lesson if we feel so inclined.
J. Le Conte, in a list of four hundred and fifty plants, collected by him on the island of New York (Manhattan), and published in the "Medical and Philosophical Register," Vol. II, 1812, mentions a hybrid walnut among the number. Dr. John Torrey, in "Catalogue of Plants," etc., 1819, refers to this tree under the name of Juglans hybrida, and says that it is growing near where Eighth avenue intersects the road called Lake Tours, about three miles from the city, and is a large tree. This specimen probably disappeared long ago, and we have no means now of determining its origin or between what two species it was a hybrid.
Recently Prof. C. S. Sargent has discovered other hybrid walnuts in the neighborhood of Boston, and figured and described one in Garden and Forest for Oct. 31, 1894. He says:
"My attention was first called to the fact by observing that a tree which I had supposed was a so-called English walnut (Juglans regia), in the grounds connected with the Episcopal school of Harvard college, at Cambridge, was not injured by the cold of the severest winters, although Juglans regia generally suffers from cold here, and rarely grows to a large size. This individual is really a noble tree; the trunk forks, about five feet above the surface of the ground, into two limbs, and girths, at the point where its diameter is smallest, fifteen feet and two inches. The divisions of the trunk spread slightly and form a wide, round-topped head of pendulous branches of unusual symmetry and beauty, and probably sixty to seventy feet high. A closer examination of this tree showed that it was hardly to be distinguished from Juglans regia in habit, in the character of the bark, or in the form and coloring of the leaves, and that the oblong nut, with its thick shell deeply sculptured into narrow ridges, was the slightly modified nut of our native butternut, Juglans regia. Two other trees with the same peculiarities were afterwards found. One is a large, wide-spreading specimen, with a trunk diameter of four feet three inches about two feet above the surface of the ground, and just below the point where it divides into three large limbs. This is on the grounds of Mr. Eben Bacon of Jamaica Plain, and is supposed to have been planted between fifty and sixty years ago. The other has a tall, straight trunk, with a diameter of three feet one inch at three feet above the surface of the ground, and is growing on a farm near Houghton's Pond, in Milton, at the base of the southeastern slope of the Blue Hills."
That there should be hybrid walnuts is nothing strange or wonderful, and we often marvel that there should be so few of them in regions where two or more species are growing in close proximity in the same forest, or elsewhere, but from whence came these specimens in Massachusetts is somewhat of a mystery. We may safely conclude, however, that the hybridizing did not occur there, but somewhere else, and either the nuts or small seedling trees were introduced and planted where these hybrid specimens are now growing. It is possible that they are descendants of the old hybrid walnut tree of New York city, mentioned by Le Conte and Dr. Torrey, some one having sent nuts or seedlings to friends in Massachusetts, and the three trees described by Prof. Sargent are merely those which have survived until the present day, these retaining the hybrid characteristics of their parent. These hybrids may or may not possess any special economic value, but they are of considerable scientific interest, and for this reason alone are well worthy of careful preservation and extensive propagation.
Butternut Sugar.—It has often been claimed that sugar can be made from the native butternut tree, and while it is true that the sweetish sap flows readily from wounds made in this tree in early spring, the amount and quality of sugar to be obtained from it is scarcely worthy of serious attention. In my boyhood days butternut syrup and sugar were considered as "sticky jokes" of the sugar camp.
[FIG. 77]. FLOWERING BRANCH OF HYBRID WALNUT.
J. regia × J. Californica.