- Chelidonium majus is a brittle, herbaceous biennial that reaches 11-31 in. (30-80 cm) in height. Its stems are ribbed and branching. The lower parts of the branches are pubescent. When the branches or leaves are broken a yellowish-orange sap can be seen.
- The alternate cauline leaves can be up to 13 in. (35 cm) in length, with petioles measuring 0.75-4 in. (2-10 cm) long. The thin leaf blades are glaucous beneath, deeply 5-9 lobed and are irregularly dentate around the margins. The veins of the lower leaf surfaces have fine, short hairs.
- The bright yellow flowers are contained in axillary pedunculate umbels. The peduncle itself measures 0.75-4 in. (2-10 cm) long. Each flower has four obovate to oblong petals that measure about 0.4 in. (1 cm) wide. This plant usually flowers from May to June.
- The "lumpy" capsules are linear to oblong-shaped and measure 0.75-2 in. (2-5 cm) in length. Within the capsule are black seeds with reticulate pitting on their surface.
- Ecological Threat
- Chelidonium majus can become abundant in minimally managed habitats and can outcompete other native herbaceous plants. It is most often found in disturbed areas especially with moist soil. Conceivably its seeds could be moved to other habitats by ants.
- 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
- Connecticut Department of Environmental Protection
- Faith Campbell, 1998
- Great Lakes Early Detection Network
- Hoffman, R. & K. Kearns, Eds. 1997. Wisconsin manual of control recommendations for ecologically invasive plants. Wisconsin Dept. Natural Resources, Bureau of Endangered Resources. Madison, Wisconsin. 102pp.
- Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
- Mid-Atlantic Exotic Pest Plant Council, 2005
- Vermont Department of Environmental Conservation
- WeedUS - Database of Plants Invading Natural Areas in the United States
- Wisconsin's Invasive Species Identification, Classification and Control Rule
|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.|