A walnuts (genus Juglans) come plants in the walnut family Juglandaceae. It is deciduous trees, 10-40m tall, with pinnate leaves 20-90cm long, by having Five-25 leaflets; a shoots own chambered pith, a character shared out by using a wingnuts (Pterocarya) but not the hickories (Carya) in the same personal.

A Twenty-one metal money in a genus range through the northerly moderate Old World from southeast Europe east to Japan, and supplementary widely in the New World from southeast Canada west to California and south to Argentina. A Latin title Juglans derives from either Jovis glans, "Jupiter's nuts", a nut healthy for a god; throughout recorded history a walnut has widely been look upon the better nut of any.

Species and classification
'Sect. Juglans'''. Leaves big (20-4Five cm) by having 5-9 wide leaflets, hairless, margins stallion. Wood protective. Southeast Europe to central Asia. Juglans regia L. (J. duclouxiana Dode, J. fallax Dode, J. orientis Dode) - Persian Walnut, Common Walnut Juglans sigillata Dode - Iron Walnut (doubtfully distinct from either J. regia) 'Sect. Rhysocaryon'. Leaves big (20-50 cm) by owning 11-23 slender leaflets, finely pubescent, margins notched. Wood difficult. North America, South America. Juglans australis Griseb. (J. boliviana Dode) - Argentine Walnut Juglans brasiliensis Dode - Brazilian Walnut Juglans californica S.Wats. - California Walnut Juglans hindsii'' (Jepson) R.E.Smith - Hinds' Walnut Juglans hirsuta Manning - Nuevo Leon Walnut Juglans jamaicensis C.DC. (J. insularis Griseb.) - West Indies Walnut Juglans major (Torrey) Heller (J. arizonica Dode, J. elaeopyron Dode, J. torreyi Dode) - Arizona Walnut Juglans major volt-ampere. glabrata Manning Juglans microcarpa Berlandier (J. rupestris Engelm.) - Texas walnut Juglans microcarpa volt-ampere. stewartii (Johnston) Manning Juglans mollis Engelm. - Mexican Walnut Juglans neotropica Diels (J. honorei Dode) - Andean Walnut Juglans nigra L. - Black Walnut Juglans olanchana Standl. & L.O.Williams - Juglans peruviana Dode - Peruvian Walnut Juglans soratensis Manning - Juglans steyermarkii Manning - Guatemalan Walnut Juglans venezuelensis Manning - Venezuela Walnut 'Sect. Cardiocaryon'''. Leaves super big (40-90 cm) by having 11-19 wide leaflets, softly downy, margins notched. Wood easy. Northeast Asia, eastern North America. Juglans ailantifolia Carr. (J. cordiformis Maxim., J. sieboldiana Maxim.) - Japanese Walnut or Heartnut Juglans cinerea L. - Butternut Juglans mandschurica Maxim. (J. cathayensis Dode, J. formosana Hayata, J. hopeiensis Dode, J. stenocarpa Maxim.) - Chinese Walnut or Manchurian Walnut

A right-known member of the genus is the Persian Walnut or even Most common Walnut (Juglans regia), native from either a Balkans in southeast Europe, southwest & central Asia to the Himalaya and southwest China. This is the metal money which is widely cultivated for its delicious nuts. A Persian Walnut is typically however incorrectly referred to as "English Walnut" in the United States (the coinage is non indigen to England).

A Black Walnut (Juglans nigra) occurs as commons coinage around its native eastern North America, and is likewise widely cultivated elsewhere. A nuts come eatable, however have a little kernel & an extremely hard scale, & it is non widely grown for nut production.

A Butternut or even Butternut Walnut (Juglans cinerea) is as well indigene to eastern N America, in which these are presently endangered by an introduced disease, butternut canker, caused by a fungus Sirococcus clavigignenti. Its leaves come 40-60 cm yearn, & a haywire ellipse.

A Japanese Walnut (Juglans ailantifolia'') is similar to Butternut, distinguished per big leaves as much as Ninety cm yearn, & around (does'nt elliptical) nuts.

;Hybrids Juglans ten bixbyi Rehd. - J. ailantifolia 10 J. cinerea Juglans ten intermedia Carr. - J. spade 10 J. regia Juglans ten notha Rehd. - J. ailantifolia 10 J. regia Juglans 10 quadrangulata (Carr.) Rehd. - J. cinerea 10 J. regia Juglans 10 sinensis (D. C.) Rehd. - J. mandschurica 10 J. regia Juglans 10 paradox Burbank - J. hindsii 10 J. regia Juglans 10 royal Burbank - J. hindsii 10 J. nigra

Uses
;Nuts A nuts of all the metal money come eatable, however a walnuts normally available inside places come from either a Persian Walnut, the sole species which has a big nut & thinly casing. a horticultural form selected for thinly nut husks & hardiness around moderate zones is another time referred to as the 'Carpathian' walnut. A nuts come rich within oil, & come widely eaten each new and around cookery. Walnuts come as well an first-class source of omega-3 fatty acids, and keep close at hand been shown when helpful inside lowering cholesterol. It require to exist as saved dry & refrigerated to store swell; withinside warmly conditions it be rancid in two or three weeks, particularly when battery.

Walnut nut shells come typically wont to produce the rich yellow-amber to dark light brown dye that is used for dyeing fabric and for other purposes. After picking walnuts, a shells should become handled wearing no-good gloves, to refrain from dyeing a single's fingers.

;Wood the Persian Walnut, & a Black Walnut & its allies, come crucial for their attractive timber, which (except inside immature trees) is stiff, heavy, pinching-grained & polishes to a super smooth finish. the color ranges from either creamy white in the sapwood to a bittersweet chocolate colorise the duramen. Whilst kiln-dried, walnut wood tends toward the dull black color, however whilst air-dried potty be the rich purplish-red. Because of its color, hardness & grain these are the prized article of furniture & carving wood. Walnut burls come unremarkably wont to produce bowls & more off pieces. A wood of the Butternut & related Asian metal money is of tremendously moo value, easy, harsh, less heavily & heavy, & blench within color.

;Parkland trees Walnuts may be attractive trees inside parks & big gardens. A Japanese Walnut particularly is grown for its immense leaves, which have a 'tropical' appearance.

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