Cystiphora schmidti

... Leaf galls are spherical and only marginally raised from the leaf surface compared to stem galls which are stretched and generally more elevated ... plant tissue is typically swollen and yellowish or maroon-colored.

- Washington State University Extension: (2022) Integrated Weed Control Project^©

Reference: http://www.invasives.wsu.edu/biological/cystiphoraschmidti.htm