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Silphium perfoliatum (Cup plant)

Silphium perfoliatum (Cup plant), in situ on low prairie (handcolored)

Silphium perfoliatum (Cup plant), in situ on low prairie (handcolored)

Silphium perfoliatum (Indian cup) specimen (handcolored), including flowers and leaves, identified as negative 968

Silphium perfoliatum (Indian cup) specimen (handcolored), including flowers and leaves, identified as negative 968

Stachys officinalis (Purple betony) specimen (handcolored)

Stachys officinalis (Purple betony) specimen (handcolored)

Stachys Palustris (Marsh woundwort) specimens (black and white), in situ

Stachys Palustris (Marsh woundwort) specimens (black and white), in situ

Stachys tenuifolia (Smooth hedge nettle), in situ (black and white)

Stachys tenuifolia (Smooth hedge nettle), in situ (black and white)

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