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Helianthemum nummularium
''Helianthemum nummularium'' (known as common rock-rose) is a species of rock-rose (Cistaceae), native to most of Europe.
==Description==
It is an evergreen trailing plant with loose terminal clusters of bright yellow, saucer-shaped flowers. In the flower centre is a tight cluster of orange stamens, which are sensitive to the touch, and spread outwards to reveal the tall stigma in the middle. The plant is common on chalk downs, and occasional in other grasslands, always on dry, base-rich soil. The wild species has yellow flowers, but garden varieties range from white through yellow to deep red.
Though the individual blooms are short-lived, the plant produces a mass of flowers through the summer. It needs a dry, sunny place, like a south-facing rockery or meadow. As the Latin name ''Helianthemum'' suggests, these are sun-flowers. This is a good nectar source for bees and there are several species of small beetle that feed on the foliage. Common rock-rose is also the food plant for the larvae of several species of moth and butterfly.
It flowers from May until July.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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