Nigella damascena, Ranunculaceae, flower.

Skimmia japonica, Rutaceae, plant in fruit.

Ptelea trifoliata, wafer ash, Rutaceae, branch with fruit.

Peganum Harmala, Zygophyllaceae, plant in flower and in fruit.

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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.