Juglans microcarpa, known also as the little walnut,[2] 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.[1][2] 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.[3]

Juglans microcarpa
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fagales
Family: Juglandaceae
Genus: Juglans
Section: Juglans sect. Rhysocaryon
J. microcarpa
Binomial name
Juglans microcarpa
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.[4]

Juglans (literally "Jupiter's acorn") is the Latin name of the walnut. Microcarpa means "having small fruit". Though very small, the seeds contained within the nuts are edible.[5]

References and external links edit

  1. ^ a b Stritch, L.; Barstow, M. (2019). "Juglans microcarpa". IUCN Red List of Threatened Species. 2019: e.T66813477A66813479. doi:10.2305/IUCN.UK.2019-1.RLTS.T66813477A66813479.en. Retrieved 20 November 2021.
  2. ^ a b USDA, NRCS (n.d.). "Juglans microcarpa". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 28 June 2016.
  3. ^ 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
  4. ^ "Juglans microcarpa".
  5. ^ 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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