Sea Spurge. In the Spring, they produce their remarkable receptacle-like flowers, which in close-up look to me like some sort of decoration for a miniature Christmas tree! The cup-shaped flower heads consist of a female flower – which is surrounded by male flowers (reduced to stamen) and four, crescent-shaped glands (known as involucre) which contain nectar, to attract pollinators. Ants are particularly attracted. A capsule-like fruit is produced, which contains just three large, resistant seeds, which reportedly can float in sea water and remain viable for several years.