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

Juglans microcarpa
Juglans microcarpa.jpg
Buds
Scientific classification e
Kingdom: Plantae
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fagales
Family: Juglandaceae
Genus: Juglans
Section: Juglans sect. Rhysocaryon
Species: J. microcarpa
Binomial name
Juglans microcarpa
Berlandier
Juglans microcarpa range map 1.png
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.[3]

Juglans (literally "Jupiter's acorn") is the Latin name of the walnut. Microcarpa means "having small fruit".

References and external linksEdit

  1. ^ a b "Juglans microcarpa". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 28 June 2016. 
  2. ^ Kershner, Mathews, Nelson, and Spellenberg National Wildlife Federation Field Guide to Trees of North America Sterling Publishing Co., inc, New York. © 2008 by Chanticleer Press, Inc. p. 228
  3. ^ http://www.fs.fed.us/database/feis/plants/tree/jugmic/all.html

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