Heather Angel / Sesame (Sesamum indicum), green unripe pods. Sichuan Province, China.

Heather Angel / Sesame (Sesamum indicum) flowers and green unripe pods. Sichuan Province, China.

Heather Angel / Sesame (Sesamum indicum), dried seed pods ready for seed harvesting. Sichuan Province, China.

Ann & Steve Toon / Devil's claw (Harpagophytum procumbens) fruit, Tswalu Kalahari private game reserve, Northern Cape, South Africa, January 2012

Bryan and Cherry Alexander / Seeds and pods of Makalani / Real fan palm (Hyphaene petersiana), Pedaliacae, Devil's claw (Harpagophytum procumbens), Bleedwood tree (Pterocarpus angolensis), Ammi visnaga (Apium genus), Combretum sp...

Philippe Clement / Devil's claw (Harpagophytum procumbens) and Devil's thorn (Tribulus zeyheri), prominent creepers of the Kalahari Desert that appear after the rains, Kgalagadi Transfrontier Park, South Africa

Philippe Clement / Devil's claw (Harpagophytum procumbens) and Devil's thorn (Tribulus zeyheri), prominent creepers of the Kalahari Desert that appear after the rains, Kgalagadi Transfrontier Park, South Africa

Philippe Clement / Devil's claw (Harpagophytum procumbens) Kalahari desert, Kgalagadi Transfrontier Park, South Africa

Philippe Clement / Devil's claw (Harpagophytum procumbens) Kalahari desert, Kgalagadi Transfrontier Park, South Africa

Michio Hoshino / Devil's Claw (Proboscidea louisianica) in temperate rainforest, Tongass National Forest, Alaska

Michio Hoshino / Devil's Claw (Proboscidea louisianica) in temperate rainforest, Tongass National Forest, Alaska