SIMON FRASER / SCIENCE PHOTO LIBRARY SIMON FRASER / SCIENCE PHOTO LIBRARY
Mountains avens and upright lousewort plants. Mountain avens (Dryas octopetala, left) is a perennial shrub that is common on sandy or gravelly soils in the Arctic and mountainous regions of Europe. It blooms in spring and throughout the summer. Upright or flame-tipped lousewort (Pedicularis flammea) is a semi- parasite, obtaining nutrients from the roots of surrounding plants through organs known as haustoria (not seen). Photographed on Clavering Island in North East Greenland National Park, Greenland.
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