Lupinus texensis, blue bonnet, Fabaceae, field and plant in flowers.

Sophora secundiflora, mescal bean, Fabaceae, plant, flowers and seeds.

Baptisia leucantha, Fabaceae, plant with inflorescence.

Senecio flabellus, groundsel, Asteraceae, plant with flowers.

Senecio spp., Asteraceae, plants with flowers.

Cacalia atriplicifolia, Asteraceae, plant with flowers.

Crotalaria sp., Fabaceae, plant with flower and fruits.

Mertensia virginica, blue bells, Boraginaceae, plant with flowers.

Onosmodium occidentale, Boraginaceae, plant with flowers.

Tylophora villosa, Asclepiadaceae, branch with flowers, fruits.

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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.