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Juglans Microcarpa

The Juglans Microcarpa is commonly known as Dwarf Walnut, Little Walnut, Mexican Walnut, Namboca, Nogal, Nogalillo, Nogalito, River Walnut, Texas Black Walnut, Texas Walnut, as well as Walnut

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Growing Regions

Little walnut grows from southwestern Kansas through Oklahoma to central New Mexico and Texas, south into northeastern Mexico [5,15,31]. In Texas, little walnut grows from the valley of the Colorado River west to the mountains of the Trans-Pecos [36]. The variety stewartii grows in the Chisos Mountains of Texas and extends into Mexico [26].

     

General Information

The currently accepted scientific name of little walnut is Juglans microcarpa Berl. [17]. Two varieties are delineated on the basis of morphological differences such as leaf and fruit size [26]. The following varieties are commonly recognized [17]: Juglans microcarpa var. microcarpa Juglans microcarpa var. stewartii Little walnut hybridizes with the closely related Arizona black walnut (Juglans major) [36], and populations which exhibit various intermediate characteristics have been reported [26]. At the eastern edge of its range, little walnut intergrades with black walnut (J. nigra) [3,31].

Texas walnut occurs abundantly in a number of riparian woodland
communities.  It is included as a dominant or indicator in the following
community type (cts) classifications:

 Area                Classification          Authority

TX: Brewster Co.     general veg. cts        Carignan 1988

NM, TX: Guadalupe    general veg. cts        Gehlbach 1967
   Escarpment

Southwest            riparian cts            Szaro 1990a

Southwest            riparian cts            Szaro 1990b      

TX: Brewster Co.     general veg. cts        Denyes 1956

Much of the information presented here is attributed to:
Tirmenstein, D. A. 1990. Juglans microcarpa. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available at USDA Forest Service.

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