Konrad Wothe / Ginkgo (Ginkgo biloba) close up of leaves, medicinal plant, Germany

Konrad Wothe / Purple Coneflower (Echinacea purpurea)

Jim Brandenburg / Coneflower (Echinacea sp) field, Wisconsin

Jim Brandenburg / Paper Birch (Betula papyrifera) bark peeling, Minnesota

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

Jabruson / Landa / Ndembo / Silkrubber tree (Funtumia elastica) bark with 30 year-old tapping score marks. Bai Hokou, Dzanga-Ndoki National Park, Central African Republic.

Jabruson / Silkrubber / Landa / Ndembo (Funtumia elastica)seed feathery aerodynamic seed delivery system caught on a tree trunk in moss next to a termite tunnel. Bai Hokou, Dzanga-Ndoki National Park, Central Af...

Jabruson / Silkrubber / Landa / Ndembo (Funtumia elastica)seed feathery aerodynamic seed delivery system caught on a tree trunk in moss next to a termite tunnel. Bai Hokou, Dzanga-Ndoki National Park, Central Af...

Simon Colmer / (Vernonia amygdalina) commonly called bitter leaf because of its bitter taste. In the wild, chimpanzees have been observed ingesting leaves to counter parasitic infections. Medicinal plant: used for w...

Simon Colmer / Leaves and flowers of (Brillantaisia kirungae) a medicinal plant used in Uganda to cure urethritis

Simon Colmer / (Cyphostemma nieriense) Medicinal plant: used in Uganda to cure elephantiasis

Simon Colmer / Wild finger millet (Eleusine indica) also known as Indian goosegrass, Wiregrass, Crowfootgrass, A Medicinal plant used in Uganda to cure stomach ache and chicken pox

Simon Colmer / Leaves of (Tetradenia riparia) a medicinal plant popular in East Africa. said to cure stomach ache, skin diseases and malaria. Anti-bacterial and anti-fungal.

Simon Colmer / Tree marigold (Tithonia rotundifolia) also known as Mexican tournesol, Mexican sunflower or Nitobe chrysanthemum. Medicinal plant: used to improve liver function, and said to cure malaria

Simon Colmer / Indigo (Indigofera ambelacensis) Medicinal plant: used in Uganda to cure worms

Simon Colmer / Flowers and leaves of (Spilanthes mauritiana) a medicinal plant with a high anti-fungal potency

Simon Colmer / Common St. Pauls wort (Sigesbeckia orientalis) Medicinal plant: used in Uganda to cure skin and fungal infections and syphilis

Simon Colmer / Madagascar periwinkle (Catharanthus or Vinca roseus) Medicinal plant: used to cure hypertension, kidney failure, malaria and diabetes. Used in the treatment of leukemia.

Simon Colmer / African Rosemallow also known as Maple Sugar, Red Hibiscus, Cranberry Shield (Hibiscus acetosella) Medicinal plant: used in Uganda as a blood tonic, leaves are edible and good source of vitamin C.

Simon Colmer / Creeping woodsorrel (Oxalis corniculata) Medicinal plant: used in Uganda to cure toothache, eliminate scars and as a diuretic. Entire plant is rich in vitamin C

Simon Colmer / Flowers and leaves of (Bothriocline tomentosa) medicinal plant used to cure diarrhoea and stop vomiting

Simon Colmer / Flower and leaves of (Bothriocline tomentosa) medicinal plant used to cure diarrhoea and stop vomiting

Simon Colmer / Candle Bush seed pods (Senna alata) also known as a Candelabra Bush, Empress Candle Plant, Ringworm Tree. Medicinal plant: effective fungicidal against ringworm and other fungal infections of the ski...

Simon Colmer / Vangueria leaves (Vangueria apiculata) a medicinal plant used to cure intestinal worms and stomach ache

Simon Colmer / Steudner's Dragon tree (Dracaena steudneri) Medicinal plant used as an anti-bacterial, anti-viral and combats high blood pressure

Michael & Patricia Fogden / St. John's-wort (Clusiaceae) fruit, one of them open exposing seeds covered by arils, Monteverde Cloud Forest Reserve, Costa Rica

Christian Ziegler / Embara Indian man with collected plants used for medical purposes, Chagres River, Barro Colorado Island, Panama

Simon Colmer / Calabash / Kamandal fruit (Crescentia cujete) Fruit crop grown for use as a container - used to carry water and other liquids. Also medicinal plant naturalised in India, New Delhi, India, November

Daniel Heuclin / Madagascar Periwinkle / Cacapoule (Catharanthus roseus) growing in an Amerindian village. Introduced to French Guiana as a medicinal plant for treatment of leukemia, lymphoma, and diabetes. August 200...

Daniel Heuclin / Coca leaves (Erythroxylum coca var. coca) held in the hand, main commercial source of cocaine, South America

Pete Oxford / Produce market where most goods are brought in by ship from the mainland, Puerto Ayora, Santa Cruz Island, Galapagos Islands, Ecuador

Miles Barton / Desert hyacinth (Cistanche tubulosa) parasitic plant with underground tuber, flowering in desert, Dubai, United Arab Emirates. Boiled stem traditionally used to cure diarrhoea. Believed to be aphrodis...

Miles Barton / Desert hyacinth (Cistanche tubulosa) parasitic plant with underground tuber, flowering in desert, Dubai, United Arab Emirates. Boiled stem traditionally used to cure diarrhoea. Believed to be aphrodis...

Miles Barton / Desert hyacinth (Cistanche tubulosa) parasitic plant with underground tuber, flowering in desert, Dubai, United Arab Emirates. Boiled stem traditionally used to cure diarrhoea. Believed to be aphrodis...

Konrad Wothe / Mudar (Calotropis procera) flowering, Libya

Albert Lleal / Opium Poppy (Papaver somniferum) dry seed pods, Spain

Suzi Eszterhas / Chimpanzee (Pan troglodytes) mother with three month old infant swallowing Rubia cordifolia for medicinal purposes, western Uganda

Kevin Schafer / Rosy Periwinkle (Catharanthus roseus) leaves and flowers used for anti-cancer medicine, Madagascar

Ingo Arndt / Purple Foxglove (Digitalis purpurea) field, Europe

Ingo Arndt / Purple Foxglove (Digitalis purpurea) flowers, Europe

Ingo Arndt / Purple Foxglove (Digitalis purpurea) flowers, Europe

Ingo Arndt / Red Poppy (Papaver rhoeas) field, Europe

Ingo Arndt / Red Poppy (Papaver rhoeas) flowers, Europe

Jose B. Ruiz / Chilli pepper plants {Capsicum annum acuminatum} medicinal cultivation. Alicante, Spain

Jose B. Ruiz / Chilli pepper plants {Capsicum annum acuminatum} medicinal cultivation. Alicante, Spain

Patricio Robles Gil / Coastal Agave (Agave shawii) blooming, Cedros Island, Pacific coast, Baja California, Mexico

Michael & Patricia Fogden / Herb layer showing diversity of leaf shapes, mid-elevation, seedling of (Heliconia reticulata), Costa Rica

Pete Oxford / Rosy Periwinkle (Catharanthus roseus) a medicinal plant in bloom, Isalo Massif, Isalo National Park, Madagascar

Tim Fitzharris / American Painted Lady (Cynthia virginiensis) butterfly on Coneflower (Echinacea sp), New Mexico

Phil Chapman / Traditional Huli land owner in medicinal plant garden, Tani valley, Papua New Guinea

Jean E. Roche / Fenugreek {Trigonella fenu-graecum} seeds, one of the most ancient medicinal plant known, France

Jim Brandenburg / Pasque Flower (Pulsatilla sp) group growing on prairie at sunset in June, Minnesota

Jim Brandenburg / Paper Birch (Betula papyrifera) forest, Minnesota

Michio Hoshino / Bearberry (Arctostaphylos uva ursi), Blueberry (Vaccinium sp), and Horsetail (Equisetum sp) in trundra, Alaska

Jim Brandenburg / Monarch (Danaus plexippus) butterfly on Thickspike Gayfeather (Liatris pycnostachya) flowers in tallgrass prairie, Minnesota

Mitsuaki Iwago / Opium Poppy (Papaver somniferum) field, Turkey

Tim Fitzharris / American Painted Lady (Cynthia virginiensis) butterfly on Coneflower (Echinacea sp), New Mexico

Martin van Lokven / Eurasian Solomon's Seal (Polygonatum multiflorum) detail of leaves, medicinal plant, Europe

Martin van Lokven / Eurasian Solomon's Seal (Polygonatum multiflorum) detail of leaves, medicinal plant, Europe

Duncan Usher / Red Poppy (Papaver rhoeas) close up of pistil and stamen, Europe

Duncan Usher / Currant (Ribes sp) close up of red berries, medicinal plant, Europe

Duncan Usher / Currant (Ribes sp) close up of red berries, medicinal plant, Europe

Flip de Nooyer / Wild Garlic (Allium ursinum) flowering in the spring, medicinal plant, Europe

Jan Vermeer / Purple Foxglove (Digitalis purpurea) blooming in meadow, poisonous and medicinal plant from which digitoxin, a cardiac drug, is derived, native to Europe, introduced to North America

Jim Brandenburg / Rose (Rosa sp) hips in fall, Minnesota

Gerry Ellis / Field Horsetail (Equisetum arvense), Pacific coast, North America

Mark Moffett / Sandwort (Arenaria kansuensis) arthritis cure is also a popular addition to rock gardens, Sichuan Province, China

Mark Moffett / Japanese Barberry (Berberis dictyophylla) blossoms with spines, a tonic derived from the plant eases intestinal distress, Sichuan Province, China

Mark Moffett / Yew (Taxus sp) tree nursery, source of Taxol drug, Sichuan Province, China

Tim Fitzharris / Wild Columbine (Aquilegia canadensis) and bee, Cascade Foothills, Washington

Gerry Ellis / Field Horsetail (Equisetum arvense) among other various vegetation, Pacific coast, North America

Gerry Ellis / Pacific Yew (Taxus brevifolia) tree bark that is harvested for medicinal use, North America

Gerry Ellis / Rosy Periwinkle (Catharanthus roseus) in bloom, plants are harvested for medicinal use, Madagascar

Jim Brandenburg / Pasque Flower (Pulsatilla sp) group growing on prairie at sunset, Minnesota

Jim Brandenburg / Sundew (Drosera sp) northern Minnesota

Tim Fitzharris / California Poppy (Eschscholzia californica) and Lupine (Lupinus sp) flowers covering hills, Tehachapi Mountains, California

Michio Hoshino / Detail of tundra lichen, Alaska

Jim Brandenburg / Monarch (Danaus plexippus) butterfly on Thickspike Gayfeather (Liatris pycnostachya) flower in tallgrass prairie, Minnesota

Mitsuaki Iwago / Sundew (Drosera binata) with a cricket in its clutches

Jim Brandenburg / Wild Columbine (Aquilegia canadensis) blossoms, Minnesota

Larry Minden / Prickly Poppy (Argemone polyanthemos) flower, Baja California, Mexico

Michio Hoshino / Bearberry (Arctostaphylos uva ursi) and Cup Lichen (Cladonia sp) in tundra, Alaska

Michio Hoshino / Pasque Flower (Pulsatilla sp) pair backlit, Alaska

Jim Brandenburg / One-flower Indian-pipe (Monotropa uniflora) resembles a fungus but is actually a shade-loving wildflower, Minnesota

Jim Brandenburg / Wild Columbine (Aquilegia canadensis) flower, Minnesota

Jim Brandenburg / Western Blue Flag Iris (Iris missouriensis) flowers, Minnesota

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

Konrad Wothe / Cinnamon (Cinnamomum aromaticum) comes from the inner bark of a tropical evergreen tree that curls into scrolls when dried, Germany

Dave Watts / Manuka /Tea tree {Leptospermum scoparium} Australia - medical plant

Dave Watts / Manuka / Tea tree {Leptospermum scoparium} Australia - medical plant

Bernard Castelein / Sweet-flag {Acorus calamus} introduced from Turkey now naturalised in Europe by rivers

Brian Lightfoot / Opium poppy flower {Papaver somniferum} Scotland, UK

Jose B. Ruiz / Fruit of Castor oil plant (Ricinus communis). Alicante, Spain, Europe

Jose B. Ruiz / Fruit of Castor oil plant {Ricinus communis} Alicante Spain

Jose B. Ruiz / Fruit of Castor oil plant {Ricinus communis} Alicante Spain

Jose B. Ruiz / Leaves of Castor oil plant (Ricinus communis). Alicante, Spain, Europe