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Wisteria (named for Caspar Wistar, 1761-1818, Professor of Anatomy in the University of Pennsylvania, but spelled Wisteria by Nuttall, author of the genus, the spelling Wistaria being a later adaptation). Leguminosae. Wisteria. Wistaria. Attractive large twiners with pea-shaped flowers, planted for covering porches (Fig. 4004), arbors, and buildings; the noblest of the woody vines for temperate regions.
Stout vines, often attaining great age and with woody trunks reaching several inches in diam.: lvs. odd-pinnate, alternate, with 9-13 lfts.: fls. blue, lilac, purplish, or white, in long drooping racemes, in late spring and early summer; calyx bell-shaped, somewhat 2-lipped from the 3 lower teeth being longer than the 2 upper ones; standard large, reflexed, narrowed below and typically with 2 callosities or appendages at base; wings falcate, auricled at base; keel obtuse, scythe-shaped; stamens diadelphous: fr. an elongated 2- valved torulose pod.—The recognized species are 2 in the eastern U. S., and 4 in eastern Asia. Under the American Code, the genus takes the name Kraunhia; the name Bradleia has also been applied. The so-called "evergreen wisteria" is Millettia megasperma, described on page 2706, Vol. V. The species of Wisteria are so much confused in domestication that few portraits of them are cited in the following account.
Wisterias will live in rather dry and sandy soil, but they prefer a deep and rich earth. The roots are long and few and go down deep, making few fibers. They resemble licorice root. They are hard to transplant, unless they have been pot-grown for the purpose or frequently transplanted in the nursery row. Unless manured heavily when transplanted, they are very slow in starting into vigorous growth. The most satisfactory method of propagation for the amateur is layering in summer; the following year the layers may be detached. Seeds grow readily, but do not reproduce the horticultural forms; such forms may be grafted on seedlings of W. frutescens or other available stock, the union being made at the crown; sometimes root-grafting is employed. Cuttings of roots, an inch or two long, are also frequently used. Cuttings of ripened wood may be struck under glass.
Those who wish to give a young wisteria an extra-good start may sink a bottomless tub in the ground and fill it with good soil. If a wisteria is to be trained to a tree, choose an old tree, if possible, which is past the height of its vigor; but good results are to be expected only when sunlight and opportunity are ample, and these can rarely be secured under a living tree-head.
The Japanese wisteria (W. floribunda) is one of the best and commonest of hardy climbers. It has pale green pinnate foliage and bears profusely of dense drooping clusters of purplish pea-shaped flowers. The clusters are about a foot long. This is the commonest and best form. The variations furnish the connoisseur with variety in habit, color, and season of bloom, but they are not as prolific, and doubling adds nothing to the beauty of the flowers. Moreover, the double flowers decay quickly in wet weather.
The wisterias bloom in May and usually give a smaller crop of flowers in August or September. The spring crop is borne on spurs, while the autumn crop is borne on terminal shoots of the season. There are several ideas about training a wisteria. A good way is to let it alone. This produces rugged twisted and picturesque branches and gives a certain oriental effect, but it is not the best method for covering a wall-space solidly or for making the best display of bloom. To cover a wall completely it is necessary to keep the leaders taut and to train outside branches wherever they are needed. If quantity of bloom is the first consideration, the vines should be pruned back every year to spurs, a common method in Japan. The low one-storied Japanese building will have a wisteria so trained that the vine follows the eaves all around the house. The foliage is all above, and the yard-long clusters of purple blossoms depend therefrom in solid unbroken linear masses two or three ranks deep. When trained as a standard, the wisteria requires much care. A fine standard is figured in G.F. 6:256 and Gng. 1:321, where directions may be found. "When young plants of wisteria are cut back to a height of 6 or 8 feet and pruned in for some years, the stem will stiffen until it is able to stand alone, and the top will spread out into a broad head."
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