 Wales is known for its shellfish, including cockles, limpet, mussels and periwinkles.Herring, mackerel and hake are the more common of the country's marine fish.The north facing high grounds of Snowdonia support a relict pre-glacial flora including the iconic Snowdon lily – "Gagea serotina" – and other alpine species such as "Saxifraga cespitosa", "Saxifraga oppositifolia" and "Silene acaulis".