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Juglans microcarpa
''Juglans microcarpa'', known also as the 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.〔http://plants.usda.gov/java/profile?symbol=JUMI〕 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.〔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〕
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.〔http://www.fs.fed.us/database/feis/plants/tree/jugmic/all.html〕
''Juglans'' (literally "Jupiter's acorn") is the Latin name of the walnut. ''Microcarpa'' means "having small fruit".
==References and external links==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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