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Notes on the ragweeds of south America with the description of two new species: Ambrosia Pannosa and A. Parvifolia (Compositae)

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Payne, W.W. Notes on the ragweeds of south America with the description of two new species: Ambrosia Pannosa and A. Parvifolia (Compositae). Brittonia 18, 28–37 (1966). https://doi.org/10.2307/2805107

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