buttercups England english field flowers Great Britain landscape meadow natural nature ranunculus spring Sussex trees wild yellow austere canada cold forbidding freezing frozen high mountain rock Rockies severe snow snowy steep boulder coast conifers Jumble landslide lichen mountains precarious slope view Whistler cloud crowfoot Italy plant pond pool Ranunculaceae reflection sky water white bare barren flower habitat hard hill hillside red rocky Sardinia stonecrop stony chalk coombe Devil's Dyke dry path South Downs track valley border line margin oak Quercus series winter agave angle big bird blue huge perch sing songbird Spain spike tiny top