- Robinia pseudoacacia is a deciduous tree that, while native to parts of the United States, has spread to and become invasive in other parts of the country. Trees grow from 40-100 ft. (12-30 m) in height. Trees grow upright in forests, but develop an open growth form in more open areas. The bark of black locust is light brown, rough, and becomes very furrowed with age.
- Leaves are pinnately compound with 7-21 small, round leaflets per leaf. Leaflets are 1.5 in. (4 cm) long. A pair of long, stipular spines is found at the base of most leaves.
- Flowering occurs in the spring, when showy, fragrant, white to yellow flowers develop in 8 in. (20.3 cm) long clusters.
- The flowers give way to a smooth, thin seed pod that is 2-4 in. (5.1-10.2 cm) in length.
- Ecological Threat
- Robinia pseudoacacia is native to the Southern Appalachians, the Ozarks, and other portions of the Midsouth, but is considered an invasive species in the prairie and savanna regions of the Midwest where it can dominate and shade those open habitats.
- Fire Effects Information System - USDA Forest Service
- Silvics of North America - USDA Forest Service
- Element Stewardship Abstract - The Nature Conservancy
- Weeds Gone Wild: Alien Plant Invaders of Natural Areas - Plant Conservation Alliance
- Invasive Plant Atlas of New England - University of Connecticut
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EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org
State Invasive List - This map identifies those states that list this species on their invasive species list. For more information, visit Invasive.org
Invasive Listing Sources
- California Invasive Plant Council
- City of Ann Arbor Michigan Parks and Recreation
- Connecticut Invasive Plant List
- Connecticut Invasive Plant Working Group
- EDDMapS Ontario
- Illinois Invasive Plant List
- Indiana Native Plant and Wildflower Society
- Invasive Plant Council of New York State
- Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
- John Randall, The Nature Conservancy, Survey of TNC Preserves, 1995.
- Massachusetts Noxious Weeds
- Mid-Atlantic Exotic Pest Plant Council, 2005
- Minnesota Department of Natural Resources, 1998
- Missouri Department of Conservation,
- National Wildlife Refuge Association, Silent Invasion: A Call to Action from the National Wildlife Refuge Association, 2002. Washington DC. 17 pp.
- Native Plant Society of Oregon, 2008
- New Hampshire Restricted Invasive Species
- New Jersey Department of Agriculture, Division of Plant Industry, 2004
- Pacific Northwest Exotic Pest Plant Council, 1998
- Pennypack Ecological Restoration Trust, Pennsylvania.
- Reichard, Sarah. 1994. Assessing the potential of invasiveness in woody plants introduced in North America. University of Washington Ph.D. dissertation.
- WeedUS - Database of Plants Invading Natural Areas in the United States
Other System LinksPlants: ROPS
NPDN Pest: PCQBQBA
NPDN Host: 35030
CategoriesCategory: Hardwood Trees
|Common Name Reference:|| USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|
|Scientific Name Reference:||USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|