"White" and "black" trees

Common nouns are often made up of a generic term, as "birch", to which is associated a precision which can be linked to the aspect of the tree: there are trees said "white" to differentiate them from "black" trees, from the same genus. Here are some examples:

Whitebeam or allouchier	Its leaves are white in underside.
Whitish alder	Its bark is clear, silver grey; the underside of leaves is grayish.
Silver birch	Its bark is white.
White oak of North America	The lower face of leaves is white.
White maple of North America	The lower face of leaves is white.
White Ash of North America	The lower face of leaves is white.
White mulberry	Its fruit is pinkish or white, sweet; his leaf is slim, green-clear.
Black mulberry	Its fruit is red-black, acidulous; his leaf is thick, dark green.
White elm or mountain elm	The underside of leaves is pubescent.
Black Walnut	Its bark is black.
White Walnut
White Poplar	Its bark is whitish; hirsute and white leaves on the underside
Black poplar (from Italy)	Its bark is blackish.
Black pine	Its bark is blackish.
White fir	Its bark is clear.

  Rubric Knowledge

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• Introduction
• Botany 
• Growth
• Classification  
• Toxic fruits
• Mythology
• Latin / English names
• Observations (dates)
• Origins  
• Records
• Soils and habitat
• Storm of 1999
• Utility