young shoot icon Home All plants About

Juglans microcarpa Berland.

Little walnut (en)

Species

Angiosperms > Fagales > Juglandaceae > Juglans

Characteristics

Shrubs or small trees , to 10 m. Bark medium gray, split into ± rough ridges. Twigs with distal edge of leaf scar notched, glabrous or bordered by poorly defined velvety zone; pith light to dark brown. Terminal buds globose to short-ovoid, not flattened, 3-5 mm. Leaves 12-29 cm; petiole 1-3(-4) cm. Leaflets 17-25, lanceolate or narrowly lanceolate, weakly to strongly falcate, 5.2-6.3(-9.6) × 0.8-1.1(-2.2) cm, margins entire or toothed, apex long-acuminate; surfaces abaxially with capitate-glandular hairs (sometimes becoming sparse late in season except along veins), often scattered scales, axils of proximal veins usually, not always, with prominent tufts of fasciculate hairs, adaxially with capitate-glandular hairs (late in season hairs sometimes becoming sparse except along veins); terminal leaflet usually small. Staminate catkins 3-7 cm; stamens 20-25(-35) per flower; pollen sacs 0.8-1 mm. Fruits 1-3, globose, 1.4-2.3 cm, smooth, with capitate-glandular hairs; nuts globose to depressed-globose, 1.1-1.7 cm, grooved, surface between grooves smooth.
More
A small bushy tree. It grows about 8 m high. The stem is 15-50 cm across. The leaves are compound and 20-33 cm long. The leaves have leaflets along the stalk. There are usually 7-13 leaflets. They are narrow and sword shaped. There are small teeth along the edge. The young leaves are grey to brown. They become green but turn yellow in autumn. The flowers are small and green. The male flowers have about 20 stamens and occur in catkins. The female flower has a 2 lobed style and occur as a few flowers at the tip of the same twig. The fruit are 12-19 mm across and have a thin hairy husk. The nut is hard and grooved with a thick shell. The seed is small and edible.
Life form perennial
Growth form tree
Growth support -
Foliage retention deciduous
Sexuality monoecy
Pollination anemogamy
Spread -
Mature width (meter) 5.08 - 5.25
Mature height (meter) 10.0
Root system tap-root
Rooting depth (meter) 1.2
Root diameter (meter) -
Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway c3

Environment

Moister areas in sub-arid climates, growing in riparian woodland communities in stream bottoms, canyons, river beds and the edges and arroyos of the Chihuahuan desert. Limestone banks of streams.
More
It is a temperate plant. It grows in moist soils often along streams. It grows from 450-1220 m altitude in the southern USA. It suits hardiness zones 7-10.
Light 7-8
Soil humidity 4-6
Soil texture 2-5
Soil acidity 3-6
Soil nutriment -
Hardiness (USDA) 6-8

Usage

The small nuts are eaten.
Uses eating environmental use experimental purposes food gene source material medicinal rootstock wood
Edible fruits nuts seeds
Therapeutic use Gunshot (unspecified), Wound (unspecified)
Human toxicity -
Animal toxicity -

Cultivation

Can be grown by seedlings. Seeds needs stratification.
Mode seedlings
Germination duration (days) 30 - 180
Germination temperacture (C°) 10 - 15
Germination luminosity -
Germination treatment stratification
Minimum temperature (C°) -29
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Juglans microcarpa unspecified picture

Distribution

Juglans microcarpa world distribution map, present in Armenia, Georgia, Mexico, Tajikistan, United States of America, and South Africa

Conservation status

Juglans microcarpa threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:442391-1
WFO ID wfo-0001067454
COL ID 3QRTY
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR) Link

Synonyms

Juglans rupestris Juglans microcarpa

Lower taxons

Juglans microcarpa var. stewartii
WorldFloraDB 2024