The peaches of New York

by U. P. Hedrick

Students of heredity would find almost conclusive proof that the peach is not a modified almond—a descendant, say, in this geologic period at least—in the fact that there is no recorded case of a peach fertilized by a peach producing an almond, or vice versa. If the relationship were at all close, if the two species had had a common origin even though in rather remote times, if they were nearly enough related readily to hybridize or be hybridized, it would be expected that now and then, as in the case of a nectarine, the peach would produce an almond or the almond a peach.

Geographical botany also opposes Knight's hypothesis, as De Candolle[15] points out, for, as he plainly shows, the almond had its origin in western Asia, it being found truly wild in many parts of south-western Asia and having been cultivated many centuries before the peach was known in these regions. On the other hand, the almond was not known in China before the Christian era whereas the peach had been cultivated there at least 2000 years anterior to the introduction of the almond. With such widely separated habitats, the two fruits can hardly be considered as parent and offspring.

We cannot close our eyes to the patent relationships of the peach and the almond. That the two constitute but one species, as we now consider species, or that they bear the close relationship of the peach and the nectarine, probably no one now in high authority will concede. But for the weight of the names we have used, and the fact that the theory still finds supporters, Knight's hypothesis, the outcropping of a speculative mind in a speculative age, might have been overlooked or dismissed with a word.

THE PEACH IN ASIA

We must have more knowledge of the peach in Asia than the bare fact that it originated somewhere in the vast empire of China. We want, first, to know what the characters of the prototypal peach were. If we can get some idea of the original wild peach of China we shall know something of how this fruit has been improved by man and, perhaps, something of its future potentialities. Second, though not essential to this study, it will be profitable to peach-growers to inquire whether there are types of peaches still remaining in China that might be improved under western cultivation. If so, we want them, since our cultivated peaches are not free from faults, some of which we might get rid of by the interjection of new blood. It is now about seventy years since Robert Fortune, the adventurous English plant-collector, began dipping into the horticultural treasures of China; and recent explorations make plain that there are still riches in plants in that country—the fact that they can now be brought through the "open door," instead of as spoils to be smuggled out, makes it easier to obtain any new types of peaches that may now be found.

What were the characters of the prototypal peach in China? The few records that have come down through the ages do not enable us to form much of a picture of the primitive peach. But plants do not change quickly in China, for their orchard-cultivation is not as intensive nor selection as assiduously practiced as in western countries, so that we are warranted in assuming that cultivation for forty centuries has not greatly changed this fruit. Besides, it is probable that the wild forms, whether truly wild or reverted escapes from cultivation, now represent closely the original indigenous stocks of the peach. Luckily, we have trustworthy sources of information in regard to both the wild and the cultivated peaches as they now grow in China. We are at this time concerned, it should be said, only with the common peach, Prunus persica.

Fortune began botanical explorations in China in 1844, since which time one enthusiast after another, thirsting for botanical spoils and honors, has brought from eastern Asia and Europe to America, varieties and species of ornamental and agricultural plants. In the accounts of these exploring and collecting expeditions, there are many records of peaches, wild and cultivated, that are now growing in China and from these we may piece out a fair description of the original races of this fruit. The United States Department of Agriculture, through its agricultural explorers, collaborators and correspondents in the Office of Foreign Seed and Plant Introduction, has given special attention to agricultural plants and from the accounts of the workers in this department alone, we can get a good picture of the peach of the Twentieth Century in China which, as we think, will represent very well the original stock from which all peaches have come.

It is now almost the unanimous judgment of scientists that the characters of plants are independent entities which are thrown into various relationships with each other in individuals and groups of individuals as varieties and species. This conception of unit-characters lies at the foundation of botanical and horticultural descriptions and of plant-breeding. It is more important, then, to know what the characters of Chinese peaches were and are than to attempt to describe in full the wild and cultivated peaches of China. In this, a horticultural study, it answers our purpose to consider chiefly the characters of the fruits.

The fruit-characters that differentiate races and varieties of cultivated peaches in America are ten, as follows: Downy skin; smooth skin; white flesh; yellow flesh; red flesh; flesh clinging to the stone; flesh free from the stone; shape more or less round; shape roundish but decidedly beaked; shape distinctly flat. Let us see by direct quotations from the workers in the United States Department of Agriculture how many of these ten fruit-characters are named in the wild and cultivated Chinese peaches of today.

Downy skin.—A downy skin is the normal condition of the peach. This character is found in all of the peaches to be mentioned in this discussion except those under the next heading.