crataegus England english Great Britain green hawthorn leaf leaves natural nature shrub spring Sussex tree wild woodland bank flowers hedgerow Stellaria stichwort verge white bluebells Dorset fern frond plant pteridophyte hedge primroses Primula roadside sward dainty Oxalidaceae oxalis sorrel wood background Bedfordshire buttercups clocks Dandelion plants ranunculus Taraxacum texture yellow alone field forest isolated landscape lone single South Downs stark art design floral flourish flower graphics red stripes vector wallpaper cowslip hybrid petals primrose