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Refers to any of aproximately 18 species of deciduous trees of the genus Carya and the walnut family ( Juglandaceae ). Most species are native to eastern North America. Hickories often reach 30 m (100 feet) in height. Many species produce edible nuts such as the shagbark hickory ( C. ovata ), the shellbark hickory ( C. laciniosa ), the mockernut hickory ( C. tomentosa ) and the pecan ( C. illinoensis ). [ 1 ]
Walnut ( Juglans)
Refers to about 20 species of deciduous trees of the genus Juglans
and family Juglandaceae . Both the black walnut ( J. nigra ),
native to eastern North America and the English, or Persian, walnut ( J.
regia ), which is native to Iran, are valuable for their timber and
edible nuts. The butternut ( J. cinerea ), native to eastern North
America also produces an edible nut. [ 1 ]
 The Encyclopaedia Britannica Online : http://www.britannica.com
 Martin, Paul S., and Drew, Charles M., 1969. "Scanning electron photomicrographs of southwestern pollen grains."
Journal Arizona Academy of Sciences 5 ( 3 ): 147 - 176. Palynology, University of Arizona : http://geo.arizona.edu/palynology
|http://www.hon.ch/Library/Theme/Allergy/Glossary/juglands.html||Last modified: Fri Jun 28 2002|