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A walnut is the edible seed of any tree of the genus Juglans (family Juglandaceae), particularly the Persian or English walnut, Juglans regia. They are accessory fruit because the outer covering of the fruit is technically an involucre and thus not morphologically part of the carpel; this means it cannot be a drupe but is instead a drupe-like nut.
Walnut trees are any species of tree in the plant genus Juglans, the type genus of the family Juglandaceae, the seeds of which are referred to as walnuts.All species are deciduous trees, 10–40 metres (33–131 ft) tall, with pinnate leaves 200–900 millimetres (7.9–35.4 in), with 5–25 leaflets; the shoots have chambered pith, a character shared with the wingnuts (Pterocarya), but not ...
The nine or ten genera in the family have a total of around 50 species, [3] and include the commercially important nut-producing trees walnut (Juglans), pecan (Carya illinoinensis), and hickory (Carya). The Persian walnut, Juglans regia, is one of the major nut crops of the world.
Juglans regia, the common walnut [1] or Persian walnut [2] amongst other regional names, is a species of walnut.It is native to Eurasia in at least southwest and central Asia and southeast Europe, but its exact natural area is obscure due to its long history of cultivation.
The plant is a legume and the fruit is a papery pod containing one or more nut-like seeds. [ 5 ] World production in 2019 was 49 million tonnes, China is the largest producing country, followed by India, Nigeria, Sudan, and the United States.
The adult sucks plant juices through a snout. The eggs are laid in fruits in the spring and summer. Many nuts are lost due to damage from the larvae, which burrow through the nut shell. [13] Black walnut is affected by European canker (Neonectria galligena). The infection spreads slowly but infected trees eventually die. [8] Walnut caterpillars
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The fruit is a lemon-shaped nut, produced in bunches of two to six together; the nut is oblong-ovoid, 3–6 cm (1 + 1 ⁄ 4 – 2 + 1 ⁄ 4 in) long [5] and 2–4 cm (3 ⁄ 4 – 1 + 1 ⁄ 2 in) broad, surrounded by a green husk before maturity in midautumn. Rodents such as squirrels help distribute the seeds.
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