Although Marshallia grandiflora has not been conclusively documented in Maryland (despite extensive searching along the Youghiogheny River) and is therefore excluded from the list of Maryland flora, this species occurs not far north of Garrett County, Maryland, in the Youghiogheny River Scour of southwestern Pennsylvania.
Note: "The plants on the Yough are now Marshallia pulchra. M. grandiflora (in the narrow, current sense) hasn't been seen alive in over a century" (Alan Weakley on Facebook, June 2, 2022).
There is 1 record in the project database.
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