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Texas Black Walnut

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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