Juglans microcarpa, known also as the little walnut, Texas walnut, Texas black walnut or little black walnut (as it belongs to the "black walnuts" section Juglans sect. Rhysocaryon), is a large shrub or small tree (10–30 ft tall) which grows wild along streams and ravines in Texas, New Mexico, Oklahoma, and Kansas, and the northernmost states of Mexico. It produces nuts with a width of 1/2—3/4 in. The pinnately compound leaves bear 7—25 untoothed to finely-toothed leaflets, each 1/4—1/2 in wide. It is found at elevations ranging from 700 ft to 6700 ft.
|Section:||Juglans sect. Rhysocaryon|
|Natural range of Juglans microcarpa|
Two varieties are recognized: J. microcarpa var. microcarpa and J. microcarpa var. stewartii.
Where the range of J. microcarpa overlaps with J. major, the two species interbreed, producing populations with intermediate characteristics. This phenomenon has also been found where J. microcarpa trees grows near J. nigra trees.
- Stritch, L. & Barstow, M. (2019). "Juglans microcarpa". IUCN Red List of Threatened Species. 2019: e.T66813477A66813479. Retrieved 2 September 2021.
- "Juglans microcarpa". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 28 June 2016.
- Kershner, Mathews, Nelson, and Spellenberg National Wildlife Federation Field Guide to Trees of North America Sterling Publishing Co., inc, New York. 2008, Chanticleer Press, Inc. p. 228
- Little, Elbert L. (1980). The Audubon Society Field Guide to North American Trees: Eastern Region. New York: Knopf. p. 358. ISBN 0-394-50760-6.
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