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CommentsStorksbill is the only Erodium sp. that is known to occur in Illinois. There are other Erodium spp. (Storksbill species), both native and introduced, that can be found in the western and SW states, but they don't occur in Illinois. Species in this genus are closely related to Geranium spp. (Cranesbill species) and both groups of plants develop beak-like seed capsules. However, the leaves of Storksbill species are pinnately compound, while the leaves of Cranesbill species are palmate.