Prairie Fleabane (Erigeron strigosus) vs. Annual Fleabane (Erigeron annuus)

These closely-related species are visually similar and can occur together in the same habitats, tend to bloom around the same time, and their flowers are nearly indistinguishable. E. annuus favors moister, more disturbed habitats with richer soil, and tolerates more shade, whereas E. strigosus ranges farther west and south, prefers drier, sunnier, slightly less disturbed habitats, and is more tolerant of alkaline soil.

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