Why do you think sea holly is described as having a 'jag'?

Sea holly is described as having a 'jag' due to the sharp, spiny edges of its leaves, which can resemble jagged or serrated shapes. This characteristic adds to its distinctive appearance and aids in its adaptation to harsh coastal environments by deterring herbivores. Additionally, the term 'jag' captures the plant's rugged and resilient nature, paralleling the coastal landscapes where it typically thrives.