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- Alcea (Hollyhocks)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Alcea (Hollyhocks), in situ, LeClaire Main Street, Gilbert House (handcolored)
- Ada Hayden
- Amorpha canescens (Lead plant)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Amorpha canescens (Lead plant) specimens (handcolored), including flowers and leaves, identified as negative 1397
- Ada Hayden
- Aster multiflorus (Dense flowered aster) specimen
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Aster multiflorus (Dense flowered aster) specimen (black and white), including flowers and leaves, identified as negative 1473. Noted as being on railroad track, road to Tower.
- Ada Hayden
- Aster novae-angliae (New England aster)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Aster novae-angliae (New England aster) specimen (handcolored), including flowers and leaves, identified as negative 989
- Ada Hayden
- Astragalus (Ground plum-vetch)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Astragalus (Ground plum-vetch), in situ (black and white)
- Ada Hayden
- Bacteria specimen
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Bacteria specimen (black and white)
- Ada Hayden
- Bidens alba (Beggar tick)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Bidens alba (Beggars tick) specimens (black and white), identified as negative 1326
- Ada Hayden
- Bidens alba (Beggar ticks)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Bidens alba (Beggars tick) specimens, including flowers and leaves (black and white)
- Ada Hayden
- Bidens alba (Beggars tick)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Bidens alba (Beggars tick) specimen (black and white), including flowers and leaves, identified as negative 1324
- Ada Hayden
- Bidens alba (Beggars tick)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Bidens alba (Beggars tick) specimen (black and white), including flowers and leaves, identified as negative 1325
- Ada Hayden
- Bidens cernua (Stick-tight, smaller bur marigold)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Bidens cernua (Stick-tight, smaller bur marigold) specimen (handcolored), including flowers and leaves, identified as negative 1325
- Ada Hayden
- Bidens cernua (Stick-tight, smaller bur marigolds)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Bidens cernua (Stick-tight, smaller bur marigold) specimen (handcolored), including flowers and leaves, identified as negative 1324
- Ada Hayden
- Bidens frondoasa and cernua (Leafy-bracted tickseed)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Bidens frondoasa to the left and cernua to the right (Leafy-bracted tickseed) specimens (handcolored), including flowers and leaves, identified as negative 1326
- Ada Hayden
- Bidens frondosa (Beggar-ticks; Boot-jacks)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Bidens frondosa (Beggar-ticks; Boot-jacks) specimen (handcolored), including flowers and leaves, identified as negative 999
- Ada Hayden
- Brassica nigra (Black mustard)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Brassica nigra (Black mustard) specimens (black and white), including flowers and leaves, identified as negative 1322A
- Ada Hayden
- Brassica nigra (Black mustard)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Brassica nigra (Black mustard) specimens (black and white), including flowers and leaves, identified as negative 1322B
- Ada Hayden
- Cacalia tuberosa (Indian plantain)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Cacalia tuberosa (Indian plantain), in situ (handcolored)
- Ada Hayden
- Cacalia tuberosa (Indian plantain)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Arnoglossum (Indian plantain), in situ (handcolored)
- Ada Hayden
- Cirsium (Thistle)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Cirsium (Thistle), in situ (handcolored)
- Ada Hayden
- Cirsium lanceolatum (Thistle)
- Botany; Botany in Iowa; Plant ecology; Prairie ecology; Prairie plants
- Cirsium lanceolatum (Thistle), in situ (black and white)
- Ada Hayden