dendroica:Eastern False Willow, a.k.a. Groundsel Bush (by…


Eastern False Willow, a.k.a. Groundsel Bush (by me)

Fun fact: This species (Baccharis halimifolia) has become an invasive weed in Queensland, leading authorities there to import my favorite gall midge, Rhopalomyia californica, as a biological control. R. californica normally galls my plant-crush Baccharis pilularis, but in the absence of B. pilularis they’ll make do with B. halimifolia, thereby replacing flower production with midge production and slowing the spread of the unwelcome plant.

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Tags: galls, the gall fandom, small but doughty.

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