Host: Bidens frondosa
Host obs: https://www.inaturalist.org/observations/246645696
Not seeing a match on Gallformers except possibly Asphondylia bidens, which only is known to occur on pilosa. And I can't find any photos of it so idek if it matches visually.
This is a picture of Andricus dimorphus on the underside of an oak leaf at Quiet Waters Park near Annapolis, Maryland.
This is a picture of a Thecodiplosis brachynteroides on a Virginia Pine at Quiet Waters Park near Annapolis, Maryland.
Maybe this. Terminal Gall or tight leaf roll on a leafy spurge
This is a picture of Resseliella liriodendri on a Tulip Poplar at Martinak State Park in Caroline County, Maryland.
This is a picture of Caryomyia recurvata on the underside of a hickory at Martinak State Park in Caroline County, Maryland.
This is a picture of Caryomyia tubicola on the underside of a hickory at Martinak State Park in Caroline County, Maryland.
This is a picture of a Acraspis quercushirta on the underside of an oak leaf at Martinak State Park in Caroline County, Maryland.
This is a picture of Acraspis pezomachoides on the underside of a White Oak at Martinak State Park in Caroline County, Maryland.
This is a picture of Andricus quercusstrobilanus on an oak at Alpha Ridge Park in Howard County, Maryland.