Medicago sativa, alfalfa, Fabaceae, field and plants in flower

Glycyrrhiza glabra, licorice, Fabaceae, diagram of plant and roots

Chenopodium quinoa, quinoa, Chenopodiaceae, plants, harvest, and seeds

Quillaja saponaria, Rosaceae, diagram of branch in flower and fruit

Sapindus drummondii, soapberry, Sapindaceae, fruits and flowers

Phytolacca americana, pokeweed, Phytolaccacae, plant with flowers and fruits

Saponaria officinalis, bouncing bet, Caryophyllaceae, plant with flowers

Agave sp., Agavaceae, plant

Yucca sp., Agavaceae, plant

Digitalis purpurea, foxglove, Scrophulariaceae, plant with flowers

Convallaria majus, lily of the valley, Liliaceae, plant with flowers

Strophanthus intermedius, Apocynaceae, flowers

Asclepias tuberosa, butterfly milkweed, Asclepiadaceae, inflorescences

Asclepias syriaca, milkweed, Asclepiadaceae, inflorescence, flowers and fruits

Asclepias curassavica, milkweed, Asclepiadaceae, plant with flowers and fruit

Danaus sp. (monarch butterfly), larva on Asclepias curassavica

Nerium oleander, oleander, Apocynaceae, flowers

Aphis nerii on Asclepias curassavica

Aposematically labelled frogs

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© David S. Seigler, Integrative Biology 425, Plant Secondary Metabolism, Department of Plant Biology, 265 Morrill Hall, 505 S. Goodwin Ave., University of Illinois, Urbana, Illinois 61801, USA. 217-333-7577. seigler@life.uiuc.edu.