cereal cob corn crop developing Devon England english farm field food Great Britain green hairy immature maize nature plants summer young Ammophila coast coastal coastline colonist Cornish cornwall dune grass habitat marram natural plant sand shore stabilise dunes Caryophyllaceae flowers little petals small spring stamens Stellaria stichwort stigma tiny verge white wild berries bush crataegus fruits haws hawthorn hill landscape meadow red shrub South Downs Sussex access barrier clouds countryside entrance exercise footpath gate sky walk wooden abundance abundant Apiaceae Bedfordshire damp many profusion riverside umbellifer