Edge of the Prairiethe sand prairies and savannas of the Chicago region

    Bidens coronata
    Marsh Bur Marigold

Bee flies (this one is probably a Bombylius sp.) are commonly observed visiting flowers in sand country. They are especially fond of the yellow disk flowers like this Bidens coronata, a common plant in native prairie marshes, where it grows among tussocks of blue-joint grass. This species is one of the more showy of the Bidens genus.

Spider devours bee fly

In this case, the fly came too close and was captured and devoured by a well-camouflaged crab spider (family Thomisidae), a non-web building, but nonetheless predatory species. Bidens species bloom in late summer, often in seasonally flooded areas of marshes.


Bidens coronata on the Northeast Wetland Flora web site hosted by the Norther Prairie Wildlife Research Center.



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