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A. A. Reznicek

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Very similar to C. semidecandrum in general appearance, and like it, an annual European weed of dry, especially sandy, sunny roadsides and disturbed areas. The two can sometimes co-occur, though C. pumilum is apparently less abundant. First collected in 1985 in Ingham and Van Buren Cos. by R. K. Rabeler (1988).

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