Tephroseris integrifolia subsp. maritima

'Tephroseris integrifolia'' subsp. maritima, also known as the spathulate fleawort or South Stack fleawort''', is endemic to Holyhead Island, occurring only around South Stack. It is a subspecies of the field fleawort Tephroseris integrifolia.

It is a single-stemmed plant, typically with more than six capitula (flower heads), which flowers between April and June.