Magnolia stellata, Magnoliaceae, flower.

Litsea amara, Lauraceae, branch with flowers.

Kibara macrophylla, Monimiaceae, branch with flowers and fruit.

Peumus Boldus, boldo, Monimiaceae, branch in flower.

Asimina triloba, Annonaceae, paw-paw, tree with fruits, flowers.

Nelumbo lutea, water lily, Nelumbonaceae, plant with flowers.

Menispermum canadensis, Menispermaceae, vine with fruits.

Berberis trifoliata, agarita, Berberidaceae, branch with flowers.

Caulophyllum thalictrioides, blue cohosh, Berberidaceae, plant and fruit.

Aristolochia grandiflora, Dutchman's pipe, Aristolochiaceae, plant with flowers.

Hydrastis canadensis, golden seal, Ranunculaceae, plant in flower with roots.

Hernandia ovigera, Hernandiaceae, tree in fruit.

Papaver somniferum, opium poppy, Papaveraceae, flowers, fruit and sap.

Sanguinaria canadensis, bloodroot, papaveraceae, root and plant in flower.

Eschscholzia mexicana, Papaveraceae, plant in flower.

Eschscholzia californica, California poppy, Papaveraceae, plant in flower.

Argemone sp., prickly poppy, Papaveraceae, plants with flower.

Dicentra cucullaria, Dutchman's breeches, Fumariaceae, plant with flower.

Dicentra canadensis, squirrel corn, Fumariaceae, plant with flower.

Corydalis aurea, Fumariaceae, plant with flowers.

Ruta graveolens, Rutaceae, plant in flower and fruit.

Croton monanthogynous, Euphorbiaceae, croton, plant with flowers.

Xanthoxylum americana, prickly ash, Rutaceae, bush in fruit.

Erythrina americana, Fabaceae, tree and inflorescence.

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© David S. Seigler, Plant Biology 363, 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.