Our ID Notes may contain important tips necessary for distinguishing this gall from similar galls and/or important information about the taxonomic status of this gall inducer.
Plant Galls of the Western United States
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Ball-gall wasp
[Page 249]
This interesting cynipid wasp induces glossy, round, polythalamous galls just below the flowers of desert broom [Baccharis sarothroides] in October.
Unless noted otherwise in the ID Notes, observations of this gall are collected in the Observation Field Gallformers Code with value b-sarothroides-ball-gall on iNaturalist. You can view them here: