Yellow Pimpernel
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Lysimachia nemorum
Common & widespread in Britain.
The bright green leaves are opposite, ovate, pointed and without teeth or hairs.
The yellow flowers are about 8mm across, borne singly on long stalks in the axil of each leaf.
They have five very narrow sepals, five pointed petals and five stamens.
The ovary is superior, forming a capsule.
Flowers from May-July.