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a) Centranthus ruber (L.) DC (native, funnel) and Apis mellifera L; b) Teucrium fruticans L. (native, bilabiate) and Xylocopa violacea (L.); c) Echinops sphaerocephalus L. (exotic, head) and Apis mellifera; d) Eschscholzia californica L. (exotic, disk) and Lasioglossum sp.
