BOB GIBBONS / SCIENCE PHOTO LIBRARY BOB GIBBONS / SCIENCE PHOTO LIBRARY
Miner's lettuce flowers (Claytonia perfoliata). This edible plant is native to North America and was introduced to Europe in the 18th Century, where it has become invasive in some areas. It is edible, and was an important source of vitamin C for the California goldrush miners. Photographed in the USA.
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