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Mock Bishop’s Weed   Ptilimnium capillaceum

The range distribution maps for the Mock Bishop’s Weed are from the Plants Database of the U.S. Department of Agriculture (USDA).

The Mock Bishop’s Weed is also known by several other names including Herbwilliam, Atlantic Mock Bishop’s Weed, and Mock Bishopweed.  This plant belongs to the Apiaceae family, which is known for plants that have a cluster of small flowers on top of a specialized head called an umbel.  Other plants in this family that have umbels include carrots, dill, and fennel.

Habitat for these plants include a wide variety of moist to wet areas, including swamps, marshes, ditches, and pond margins.  They grow to a height of about 18 inches.  Their main stems, which are hollow, can have many branches. Flower heads form at the end of every stem.  The small white flowers bloom in spring and early summer.  These plants serve as host plants for the Eastern Black Swallowtail butterfly.  The plants are found throughout much of Florida and eastern and south central United States.

All of the images on this page were taken in Punta Gorda in Charlotte County.  The lower left image shows a paper wasp on the plant; a pair of mating Blister Beetles on the plant is shown in the lower right image.