Flora of North America species comparison

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Juglans microcarpa

little walnut, namboca, nogal, nogalito
Habit 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.
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.
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.
Terminal

buds globose to short-ovoid, not flattened, 3-5 mm.
Staminate

catkins 3-7 cm;

stamens 20-25(-35) per flower;

pollen sacs 0.8-1 mm.

Juglans microcarpa
Phenology Flowering spring (Mar–Apr[-Jun]).
Habitat Along creeks and rivers
Elevation 200-2000 m (700-6600 ft)
Distribution
from FNA
KS; NM; OK; TX; Mexico (Chihuahua, Coahuila, and Nuevo León)
[WildflowerSearch map]
[BONAP county map]
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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 3.
Parent taxa Juglandaceae > Juglans
Sibling taxa
J. californica, J. cinerea, J. hindsii, J. major, J. nigra
Synonyms J. rupestris
Name authority Berlandier: in J. L. Berlandier and R. Choval, Diario Viaje Comis. Limites, 276. (1850)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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