Gateshead Birders

Photo © Keith Robson
6th August 2009, Stargate Quarry, Gateshead, Durham, UK

Note the dark dots on the petals; such dots on the edges (but not the backs) of the petals distinguish common St John's-worts from related species. The flowers have been used as a reddish dye. (If you rub a petal between your fingers, it will leave a dark red-purple stain.)

Habitat: roadsides, fields, waste places
• Height: 1-2.5 feet
• Flower size: 3/4 to 1 inch across
• Flower color: yellow
• Flowering time: June to September

Flower

Photo © Keith Robson
6th August 2009, Stargate Quarry, Gateshead

Sepals

Photo © Keith Robson
6th August 2009, Stargate Quarry, Gatesheadm