The Pecan and its Culture - H. Harold Hume

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rel="nofollow" href="#ulink_c49cb31e-2825-5395-810d-ece536766154">[B] Yearbook U.S. Dept. of Agr., 1903, page 686, and 1904, page 728.

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      The pecan is found as a forest tree in the moist bottom lands along the Mississippi river and its tributaries, from Indiana southward to Mississippi, and from Iowa to Texas and Mexico.

      This region (see Fig. 1) in which the pecan is, or has been found, native, reaches its northern limit at Davenport, Iowa. It skirts the Wabash as far north as Terre Haute, Indiana, and along the Ohio river nearly to Cincinnati, Ohio. From thence its range extends south to Chattanooga, Tenn., and on to Vicksburg, Miss. From Vicksburg it skirts the Gulf of Mexico at a distance of seventy-five to one hundred miles to Laredo, Texas; thence along the Salado river into Mexico. The western boundary embraces the headwaters of the Colorado river and returns more or less directly to Davenport, Iowa. On the outskirts of this area, it extends farthest in all directions along the streams and rivers, while on the drier intervening ground the line does not extend so far from the center of the region. Particularly is this true in Southwestern Texas, where the pecan is confined almost solely to river bottoms.

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Fig. 1. Approximate Pecan areas. Native areas within solid line. Cultural area within dotted line.

      The attempts which have been made from time to time to cultivate the pecan in the more northerly States have not proved successful. The tree has, in many cases, grown well, but fruit has not been produced. The pistils and stamens of the pecan are not found in the same flower but in different flowers borne some distance apart on new and one-year-old wood, respectively. Consequently, it frequently happens that the flowers are not matured at the same time, as a result of which pollination cannot take place. Moreover, late spring frosts often destroy one or both sets of flowers, and the result, as far as fruit is concerned, is the same in either case. As a result of these experiences, the pecan cannot be recommended as a nut-bearing tree north of its natural range in the Mississippi Valley, neither will it succeed at the high elevations in the Alleghany mountains. It reaches its most northerly cultural extension in the Mississippi valley and in the coastal plain of the Atlantic seaboard. But it grows well and makes a good shade tree farther north, and at elevations far above its native range. Even then, however, the nuts from which these seedling shade trees are grown should be brought from the northern sections of its natural distribution. They are much more likely to withstand the rigorous cold of winter.

      Frequently the question is asked as to whether the pecan can be grown in a certain given locality. Such a question can be answered only in the most general way. The presence of the larger species of hickories in the vicinity may be used in some parts of the country as an indication of the success which might attend the planting of pecan trees, but such a guide should not be followed too implicitly, and even if the pecan tree should grow well, fruit might not be secured.

      The presence of pecan trees, single specimens perhaps, or two or three, in yards or about buildings here and there throughout a region, may be taken as a guide in the matter of planting, and no better can be had. Nothing will take the place of a practical demonstration in the way of a vigorous fruiting tree.

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      The aborigines of the country used hickory nuts of different kinds as food, and in the region in which the pecan grows as a native tree, it was valued by them above all its relatives.

      Penicaut found in his travels that the Indians stored large amounts of pecans for winter use. The scientific name of the pecan is appropriately derived from two Indian words, "powcohiccora" and "pacan."

      In 1785, the pecan was described under the name Juglans Pecan, by Marshall in his Arboretum Americanum. In 1818, Thomas Nuttall, an English botanist, separated the hickories from the walnuts and butternuts, putting them under a new genus which he called Carya, naming the pecan Carya olivaeformis. Nuttall's classification was followed for many years until it was found that in the year previous to the publication of his work, 1817, C. S. Rafinesque, a French naturalist, had separated the hickories along the same lines as Nuttall and published them under the name Hicoria. In accordance with the laws of priority, Rafinesque's name, Hicoria, takes precedence over Carya.

      The family Juglandaceæ, embraces but two genera, Juglans and Hicoria, the former including the walnuts and butternuts, and the latter the pecan and other hickories. With the exception of the Shellbark hickory, Hicoria ovata Britton, and the Big shellbark, Hicoria laciniosa Sargent, the pecan is the only one of the genus worthy of cultivation.

      Family. Juglandaceæ Lindl. Nat. Syst. Ed. 2, 180. 1836. Trees with alternate pinnate leaves and monœcious bracted flowers. Staminate flowers in long, drooping catkins, provided with three or more stamens and occasionally with an irregular-lobed perianth adnate to the bractlet and a rudimentary ovary. Anthers erect, with short filaments, two-celled; dehiscent longitudinally. Pistillate flowers bracted with a three to five, normally four-lobed calyx and sometimes with petals. Ovule solitary, erect, styles two, stigmatic along the inner surface. Fruit a bony nut, incompletely two to four-celled. Seed large, two to four-lobed, cotyledons corrugated, oily, without endosperm.

      Genus. Hicoria Raf. Med. Rep. (II) 5:352. 1808. Trees, with close or scaly bark, odd-pinnate leaves and serrate leaflets. Staminate flowers in slender drooping catkins, borne in groups of three, occasionally on the new shoots, but usually from buds just back of the terminal buds on last year's shoots, calyx naked, adherent to the bract, unequally two-third lobed or cleft; stamens with short filaments, three to ten in number. Pistillate flowers, two to eight, produced on a terminal peduncle, calyx four-parted, petals none, styles two to four, short, papillose. Fruit oblong, or obovoid, the husk separating into four parts; nut smooth or angled, bony, incompletely two to four-celled. Seed oily, sweet, edible or bitter and astringent. Natives of eastern North America and Mexico.

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