bright bush countryside England english flowers gorse Great Britain Leguminosae natural nature plant Prickly rural shrub spiny spring Sussex Ulex wild yellow downland fabaceae flower flowering plant Herbaceous plant Hippocrepis comosa Horseshoe Vetch petal Surrey Terrestrial plant antenna brimstone butterfly diptera fly forewing Gonepteryx rhamni greenbottle hindwing insect Lepidoptera pink rest rhopalocera summer sweet pea visit wing