Davidia involucrata England english flowers garden Great Britain natural nature petals pocket handkerchief spring tree white buttercups green Lofoten Islands norway norwegian plants ranunculus summer Umbelliferae umbellifers verge wayside wild yellow art background curves design floral flourish flower graphics leaf plant spiral swirl vector white background earthenware geranium patio pelargonium pot pot plant red terracotta wall beautiful color colours ecology fence gardening graphic illustration leaves outdoors pink pretty scrapbooking sketch cream Filipendula ulmaria herbaceous meadowsweet perennial reserve Rosaceae Surrey Caryophyllaceae Devon little small Stellaria stichwort tiny abundant anthers bright colors corolla cultivar display filaments flora flowering-plant foliage garden-flower garden-plant hibiscus Malvaceae ornamental papery popular prolific shrub stamens staminal-column stigmas trumpet-shaped variety Cornish cornwall Davidia flowerhead ghostly handkerchief pocket