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Brassica nigra (Black mustard)

Brassica nigra (Black mustard) specimens (black and white), including flowers and leaves, identified as negative 1322A

Brassica nigra (Black mustard) specimens (black and white), including flowers and leaves, identified as negative 1322B

Cacalia tuberosa (Indian plantain), in situ (handcolored)

Arnoglossum (Indian plantain), in situ (handcolored)

Cacalia tuberosa (Indian plantain), in situ (handcolored)

Arnoglossum (Indian plantain), in situ (handcolored)

Cirsium (Thistle), in situ (handcolored)

Cirsium (Thistle), in situ (handcolored)

Cirsium lanceolatum (Thistle), in situ (black and white)

Cirsium lanceolatum (Thistle), in situ (black and white)

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