altitude cold habitat harsh high lichens low growing natural nature norway norwegian odd plants resilient small strange unusual white green hardy orange carpet ecology gray grey mat buds flowers pink red appearance bloom blooming blooms buttercup-family colored colorful colors coloured colourful colours contrast contrasting dark display distinctive edges evergreen flora flower foliage Hellebore Hellebores Helleborus Lenten-rose low-growing perennials poisonous Ranunculaceae rhizome-rooted shrub shrubbery subtle-shades toxic toxicity beach coast coastline dune-flora dunes grass grasses greenery growing growth levels low tide ocean ocean edge ocean waterline receded receding receding tide rough salt-resistant sand sand-dunes Sandbar scrub tidal tides vegetation water waterline