The genus Picea consists of about 30 species of evergreen trees found in
cool, temperate regions of the northern hemisphere. Seven species of
Picea, including black spruce, are native to North America. The
currently accepted scientific name of black spruce is Picea mariana
(Mill.) B.S.P. .
Natural hybridization between species of Picea is common. Natural
hybrids between black and red spruce (P. rubens) are common where the
ranges of these two species overlap in Nova Scotia, New Brunswick, and
Quebec . Although rare, natural hybrids between black and white
spruce (P. glauca) have been found in Minnesota and other areas .
- 41. Little, Elbert L., Jr. 1979. Checklist of United States trees (native and naturalized). Agric. Handb. 541. Washington, DC: U.S. Department of Agriculture, Forest Service. 375 p. 
- 65. Viereck, Leslie A.; Johnston, William F. 1990. Picea mariana (Mill.) B.S.P. black spruce. In: Burns, Russell M.; Honkala, Barbara H., technical coordinators. Silvics of North America. Volume 1. Conifers. Agric. Handb. 654. Washington, DC: U.S. Department of Agriculture, Forest Service: 227-237. 
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