Snake's Head Fritillary
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Fritillaria meleagris
Scarce & localized in Britain.
The flower has a chequered pattern in shades of purple, or is sometimes pure white.
It flowers from March to May and grows between 15–40 cm (6–16 in) in height.
The plant has a button-shaped bulb, about 2 cm (0.79 in) in diameter, containing poisonous alkaloids.
It grows in grasslands in damp soils and river meadows at altitudes up to 800 m (2,625 ft).