Caryophyllaceae coast Cornish cornwall England english flora flowers Great Britain natural nature sea campion Silene spring white access coastline entrance footpath gate path sea view water wood architecture bridge landmark pillar railway river stone train transport viaduct green homes houses landscape meadow wall cliff hard ocean rock shore tide waves coastal pool rockpool rocks rocky worn cowslip petals Primula veris Primulaceae wild yellow home Marazion seaside town blue clifftop