The tiny Four-leaved Allseed (Polycarpon tetraphyllum) is currently in flower down on the beach at Ferrybridge. It is a nationally rare plant and can only be found in a handful of other sites in the U.K. The flowers are only 2 – 3 mm, and its seeds can survive long periods in the soil before germinating, allowing it to wait for the perfect conditions to grow (sometimes years).
Records of this plant at Ferrybridge date back 250 years.