When I first saw this plant, in 1998, it was relatively uncommon. I had trouble finding a name for it; it wasn't listed in my field guides.
White Clay Creek State Park -- Pump House Road April 2012
Now it is among the worst of the invasive plants in Delaware.
Brandywine Creek State Park April 2004
This plant covers acres along streams in Delaware, including the Brandywine Creek floodplain. Note the Virginia bluebells in the foreground. It's ideal habitat for both plants, but the bluebells can't compete.
Middle Run Valley Natural Area March 2016
The leaves emerge in late winter and form a dense mat.
Middle Run Valley Natural Area March 2016
The plant resembles the rare native marsh marigold, but three sepals confirm that it's celandine.
Middle Run Valley Natural Area March 2016
A single plant.
Middle Run Valley Natural Area March 2016
The plant spreads by growing new plants from tubers...
White Clay Creek State Park -- Creek Road May 2016
...and from bulblets that grow in the leaf axils.
White Clay Creek State Park -- Creek Road May 2016
The leaves die in late spring, leaving the bulblets free to be washed downstream or spread in mud on shoes and bike tires.
Delaware Wildflowers
