Manchurian Walnut

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Manchurian Walnut

 

(Juglans manshurica), a monoecious deciduous tree of the family Juglandaceae. The trunk is up to 30 m tall, smooth, straight, with a rounded crown. The leaves, which are alternate, compound, and odd-pinnate, measure up to 1.25 m long; there are oblong-elliptic serrated leaflets. The small unisexual flowers appear when the leaves open. The staminate flowers are in long drooping catkins; the pistillate flowers are in groups of three to ten at the ends of the shoots. The fruits are drupelike and have green or brownish fleshy husks.

The Manchurian walnut grows in northern China, Korea, and the USSR (in the Primor’e and the Amur Region). It is found in mixed cedar and broad-leaved forests along river valleys and in the lower mountain zones. The fruits of the Manchurian walnut are edible but have a very thick, tough shell; they are used in the confectionery industry to obtain high-quality oil. The lumber is hard and has a beautiful texture. The narrow sapwood is light gray, and the heartwood is brown. The wood is used in the manufacture of furniture, various art objects, and high-quality plywood. The bark, leaves, and fruits contain tannins. The Manchurian walnut is used in the landscaping of many cities of Siberia and the European USSR.

REFERENCE

Usenko, N. V. Derev’ia, kustarniki i liany Dal’nego Vostoka. Khabarovsk, 1969.

V. N. GLADKOVA

References in periodicals archive ?
(2012) report that steam treatment prior to vacuum-drying reduces overall drying time of poplar and Manchurian walnut (Juglans mandshurica).
They currently comprise conifers (29%) including Korean pine Pinus koraiensis, eastern white pine Pinus strobus and Japanese larch Larix leptolepis and broad-leaved trees (71%) including Japanese white birch Betula platyphylla, Manchurian walnut Juglans mandshurica and Japanese emperor oak Quercus dentata.
Manchurian walnut (Juglans mandshurica) is found in Korea and is similar in some respects to European walnut, although it is usually straighter grained.
A new quinone compound, p-hydroxymethoxybenzobijuglone (HMBBJ), isolated from Juglans mandshurica by bioassay-guided fractionation, showed cytotoxic activity against HeLa cell line.
Juglans mandshurica is one of rare species of trees for pharmacy resources.
Cytotoxic diarylheptanoids from the roots of Juglans mandshurica. J.
mongolica Litv.), and three hardwood species, Manchurian walnut (Juglans mandshurica Maxim.), Asian white birch (Betula platyphylla Suk.), and Mongolian oak (Quercus mongolica Fisch.
Other walnuts of note include Juglans cordiformis or Japanese walnut; Juglans mandshurica or Manchurian walnut, which grows in Korea; Juglans australia, the walnut of Australia: and Juglans neotropica, the walnut from Peru.
Juglone was extracted from Juglans mandshurica bark via vacuum-assisted steam stripping.
Xu reported a yield of only 0.02 to 0.4 mg juglone per gram of fresh branch bark from Juglans mandshurica in northeast China (Xu and Xu 1990).
In this paper, a vacuum-assisted steam stripping extraction of juglone from Juglans mandshurica bark is described.