Hornungia petraea Hutchinsia

A very small winter annual, rarely more than 10cm high (often smaller), with neat, pinnate leaves and tiny white flowers that have very narrow petals. Seed pods are elliptical and flattened. It is a rare species in Britain which grows in open sandy areas or on limestone rocks in coastal areas. Plants recorded inland from chalk pits and walls are usually regarded as aliens. It is a UK (and Wales) red species (of least concern) and it is on the rare plants register of several Welsh vice counties, including Glamorgan (VC41). It is exclusively a plant of coastal habitats in West Glamorgan, associated with open habitats on sand dunes, often on south-facing banks, appearing in early spring usually growing in beds of moss. Populations can be large but the numbers of plants found  in any one location can vary from year to year. It has been lost from a number of sites in the county as a result of habitat destruction.

Native