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Populus tremuloides (Aspen)

Populus tremuloides (Aspen) specimen (black and white), including flowers and leaves, identified as negative 469

Echinacea purpurea (Coneflower) specimen(black and white), including flowers and leaves, identified as negative 398

Erigeron strigosus (Daisy) specimen, including flower, leaves and root, identified as negative 158

Data reflecting quantity of plant material above and below ground in tons per acre, dry weight

Original Forest Cover Map, Iowa State Planning Board

Plant specimen (black and white), identified as number 1469

Dicentra cucullaria (Dutchman's breeches), in situ (black and white)

Erigeron strigosus (Daisy), in situ (Black and white)

Plant, in situ (black and white)

Convolvulus arvensis (Morning glory), in situ (black and white)

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