Alpine Bistort arctic Bistorta vivipara flowers green Lofoten Islands meadow norway norwegian Persicaria Polygonum Rhinanthus minor summer white wild yellow yellow rattle art background black branch design floral flourish flower graphics hi-res illustration isolated pink plant red tree vector wallpaper white background blue cloud England english exercise farm fence footpath gate Great Britain iron landscape sky Sussex track trail trailhead walk Austria austrian austrian flag banner flag footbridge gmunden Jetty lake landing stage mountain sunny tower traunsee upper austrian water waterside beautiful color colours ecology garden gardening graphic leaves nature outdoors pretty scrapbooking sketch spring