Conical, thick-walled, lateral bud gall...Rhopalomyia enceliae Felt
The gall is 6 mm long, 3 mm in diameter, gray, and its apex is rounded or flared. Galls are monothalamous but occasionally confluent and may deform the stem...
- Raymond J. Gagne: (1989) The plant-feeding gall midges of North America©