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New Plant Observed in Dyke Marsh

brown-eyed Susan Brown-eyed Susan (Rudbeckia triloba). Photo by Ed Eder

Several people observed brown-eyed Susans (Rudbeckia triloba) this summer, 2017, along the Haul Road.  It appears to be a new species of Rudbeckia for Dyke Marsh and this is the first photographic record of the species on George Washington Memorial Parkway (GWMP) properties.  The plant was last observed in GWMP in Great Falls Park in 1919.

The brown-eyed Susan has alternate lanceolate or ovate leaves, reddish hairy stems and characteristic tri-lobed leaves near the bottom of the plant.  Each upper stem has one or two flower heads which bloom from middle to late summer. The flower rays are bright yellow and oblong.

A number of pollinators use the plant, including solitary bees, carpenter bees, halictid bees, wasps, beeflies, butterflies and the goldenrod soldier beetle. 

brown-eyed SusanThe brown-eyed Susan has tri-lobed leaves near the bottom of the plant. Photo by Ed EderRudbeckia triloba is an annual or biennial species.  It is uncertain how it arrived in Dyke Marsh.   Habitats where it has been found include areas with a history of disturbance, such as roadsides, railroad edges, vacant lots and abandoned fields.  The existing population is small and close to the marsh.  Observers have only seen two plants, “so, being a short-lived species, their persistence seems questionable in Dyke Marsh,” commented Brent Steury GWMP’s Natural Resources Program Manager.  To see the plant’s range in Virginia, visit VirginiaPlantAtlas.org.

Thank you, Ed Eder, for your keen observations.

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