Black oak
Description
The black oak, Quercus velutina (not Quercus nigra), has a black or dark brown bark and is native to the Eastern and Midwestern part of the United States. These small, but fast growing trees grow on rocky hillsides and sandy ridges. While the tree is occasionally used for lumber, its most important commercial product is a yellow dye obtained from the trees orange-yellow inner bark. The dye bark was named Quercitron in the late 18th century and brought to Europe as a substitute for Weld dye. The bark also contains tannins that were used in the leather industry. Quercitron contains three colorants: Quercetin, quercetagetin and Flavine. The dye is extracted from the black oak bark with boiling water. The outermost layer gives a bright yellow while the inner bark gives a darker oranges and tans.
Synonyms and Related Terms
black oak (Quercus velutina); water oak (Quercus nigra); chêne noir américain (Fr.) ; yellow oak; American oak; quercitro
Physical and Chemical Properties
- Medium trees growing to 25 m.
- Bark=rough, nearly black with deep vertical furrows and horizontal breaks.
- The inner bark is bright yellow-orange.
- Leaves=shiny green with 5 to 7 lobes.
- Fruit=ovoid acorns with bowl shaped cap maturing in late summer every 2 years.
Additional Images
Yellow oak (Quercus velutina)
radial section
Yellow oak (Quercus velutina)
tangential section
Yellow oak (Quercus velutina)
transverse section
Resources and Citations
- Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996 Comment: lists tree as Quercus velutina
- John and Margaret Cannon, Dye Plants and Dyeing, Herbert Press, London, 1994
- Encyclopedia Britannica, http://www.britannica.com Comment: "black oak" [Accessed September 19, 2003]. lists tree as Quercus velutina)
- Virginia Tech Dendrology website at www.fw.vt.edu/dendro/dendrology/main.htm (accessed Oct. 8, 2005)
- Wikipedia: http://en.wikipedia.org/wiki/Black_oak (Accessed Oct. 8, 2005)
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998