Juglans microcarpa

Berlandier in J. L. Berlandier and R. Choval

in J. L. Berlandier and R. Choval, Diario Viaje Comis. Limites, 276. 1850.

Common names: Little walnut nogal nogalito namboca
Illustrated
Synonyms: Juglans rupestris Engelmann ex Torrey
Treatment appears in FNA Volume 3.

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.


Phenology: Flowering spring (Mar–Apr[-Jun]).
Habitat: Along creeks and rivers
Elevation: 200-2000 m

Distribution

V3 950-distribution-map.gif

Kans., N.Mex., Okla., Tex., Mexico (Chihuahua), Mexico (Coahuila), Mexico (and Nuevo León)

Discussion

Specimens of Juglans microcarpa with larger leaflets (parenthetical numbers above) may result from introgression with J. major. These have sometimes been treated as J. microcarpa var. stewartii (I. M. Johnston) W. E. Manning, but W. E. Manning (1978) reported this variety only from Mexico. Intermediates between J. microcarpa and J. nigra (q.v.) are also known.

Selected References

None.

Lower Taxa

None.
... more about "Juglans microcarpa"
long-acuminate +
Alan T. Whittemore +  and Donald E. Stone +
Berlandier in J. L. Berlandier and R. Choval +
medium +
4-lobed +  and 2-6-lobed +
elongate +
3 cm30 mm <br />0.03 m <br /> (7 cm70 mm <br />0.07 m <br />) +
Little walnut +, nogal +, nogalito +  and namboca +
Kans. +, N.Mex. +, Okla. +, Tex. +, Mexico (Chihuahua) +, Mexico (Coahuila) +  and Mexico (and Nuevo León) +
200-2000 m +
in terminal racemes +  and solitary +
globose +
1.4 cm14 mm <br />0.014 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
not compressed +
Along creeks and rivers +
multiradiate +
indehiscent +
indehiscent +  and dehiscent +
hard +  and fibrous-fleshy +
3-lobed +  and triangular +
even-pinnate +
aromatic +
12 cm120 mm <br />0.12 m <br /> (29 cm290 mm <br />0.29 m <br />) +
subsessile +  and sessile +
6.3 cm63 mm <br />0.063 m <br /> (9.6 cm96 mm <br />0.096 m <br />) +
1.1 cm11 mm <br />0.011 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
5.2 cm52 mm <br />0.052 m <br /> (6.3 cm63 mm <br />0.063 m <br />) +
aromatic +
narrowly lanceolate;weakly strongly falcate +
0.8 cm8 mm <br />0.008 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
entire +  and serrate +
toothed +  and entire +
15 cm150 mm <br />0.15 m <br /> (17.5 cm175 mm <br />0.175 m <br />) +
4.3 cm43 mm <br />0.043 m <br /> (15 cm150 mm <br />0.15 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (6.5 cm65 mm <br />0.065 m <br />) +
smooth +  and rugulose +
globose +  and depressed-globose +
large +
1.1 cm11 mm <br />0.011 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
2-carpellate +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flowering spring (Mar–Apr[-Jun]). +
light +  and dark-brown +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
in J. L. Berlandier and R. Choval, Diario Viaje Comis. Limites, +
Illustrated +
pilose +  and glabrous +
Juglans rupestris +
Juglans microcarpa +
species +
not flattened +, globose +  and short-ovoid +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
purplish brown +
tree +  and shrub +