Jose B. Ruiz / Leaves of Castor oil plant

Christian Ziegler / St. John's-wort (Calophyllum longifolium) sapling with herbivore damage due to its nutritious leaves, Barro Colorado Island, Panama

Pascal Tordeux / Cup plant (Silphium perfoliatum) in flower. Picardy, France, July.

Pascal Tordeux / Common Chicory / Succory / Coffeeweed / Blue Sailors (Cichorium intybus). Picardy, France, July.

Pascal Tordeux / Tobacco (Nicotania tabacum) leaves. France, July.

Pascal Tordeux / Tobacco (Nicotania tabacum) leaves. Picardy, France, July.

Pascal Tordeux / Wild Strawberry (Fragaria vesca) in flower. Picardy, France, July.

Pascal Tordeux / Common Chicory / Succory / Coffeeweed / Blue Sailors (Cichorium intybus). Picardy, France, July.

Pascal Tordeux / Caper Spurge / Paper Spurge / Gopher Plant (Euphorbia lathyris). French Alps, July.

Pascal Tordeux / Rhubarb (Rumex alpinus / Rheum rhaponticum / rhabarbarum). French Alps, July.

Pascal Tordeux / Yarrow / Gordaldo / Nosebleed Plant / Old Man's Pepper / Devil's Nettle / Milfoil / Soldier's Woundwort (Achillea millefolium). French Alps, July.

Pascal Tordeux / Garlic (Allium sativum) flower. Picardy, France, July.

Matthias Breiter / Common Self Heal (Prunella vulgaris) flowers, Prince Rupert, Canada

Duncan Usher / Currant (Ribes sp) flowers which will ripen into fruit, medicinal plant, Europe

Mark Moffett / Chinese Caterpillar Fungus (Cordyceps sinensis) collected my man, the fungus is eaten to strengthen the immune system, Sichuan Province, China

Flip de Nooyer / Chamomile (Anthemis sp) flowers, Netherlands

Gerry Ellis / Herbs, plants, and forest products for sale in open market, Iquitos, Peru

Mark Moffett / Ponerine Ant (Ectatomma tuberculatum) protect Passion Flower (Passiflora sp) in return for sweet sap that oozes from the green spots along petals of flower, Peru

Konrad Wothe / Chamomile (Anthemis arvensis) and Corn Poppy in flowering meadow, Italy