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Photo#555963
flower gall on Yellow Coneflower - Asphondylia ratibidae

flower gall on Yellow Coneflower - Asphondylia ratibidae
Sand Hill Prairie, Chichaqua Bottoms Greenbelt, Polk County, Iowa, USA
July 29, 2011
Size: ~4 mm tall
A few flowerheads of the very abundant Yellow Coneflowers (Ratibida pinnata) in this prairie were distorted by unusual growths of some disc flowers. Are these galls?

gathering_2011

Images of this individual: tag all
flower gall on Yellow Coneflower - Asphondylia ratibidae flower gall on Yellow Coneflower - Asphondylia ratibidae flower gall on Yellow Coneflower - Asphondylia ratibidae flower gall on Yellow Coneflower - Asphondylia ratibidae

Moved
Moved from ID Request.
According to Gagne (1) this gall is only known from Texas, on R. columnifera, but it must be the same species. It is evidently the only gall recorded from Ratibida.

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