Ammophila coast coastal coastline colonist Cornish cornwall dunes England english grass Great Britain habitat marram natural nature plant sand shore stabilise dune Caryophyllaceae Devon flowers little petals small spring stamens Stellaria stichwort stigma tiny verge white wild access barrier clouds countryside entrance exercise footpath gate landscape meadow sky summer Sussex walk wooden abundance abundant Apiaceae Bedfordshire damp field many profusion riverside umbellifer ancient architecture beak beast capital carved elements griffin gryphon historical monster mythical old statue stone wings cloud farm fence green pastoral peace South Downs track trees valley bend country crops fields hills lane light Morning road rural sunlight wet wiltshire winter