''Draba aizoides'' is a species of flowering plant in the family Brassicaceae, known as yellow whitlow-grass. It is native to Europe where it is found on

limestone Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms whe ...

rocks and walls. In the British Isles it is found only on the Gower Peninsula in Wales.

Description

''Draba aizoides'' is a

perennial plant A perennial plant or simply perennial is a plant that lives more than two years. The term ('' per-'' + '' -ennial'', "through the years") is often used to differentiate a plant from shorter-lived annuals and biennials. The term is also wide ...

, with a basal rosette of linear, stiff, entire leaves fringed with white bristles. The erect hairless and leafless stems grow to , or exceptionally to , and carry a small number of yellow flowers. These have four broad, hardly-notched petals and four hairless sepals. The seed pods are elliptical. The plant flowers in March and April in the British Isles.

Distribution and habitat

''Draba aizoides'' has a wide distribution in the mountains of southern and central Europe, from the

Pyrenees The Pyrenees (; es, Pirineos ; french: Pyrénées ; ca, Pirineu ; eu, Pirinioak ; oc, Pirenèus ; an, Pirineus) is a mountain range straddling the border of France and Spain. It extends nearly from its union with the Cantabrian Mountains to C ...

in the west, through the

Alps The Alps () ; german: Alpen ; it, Alpi ; rm, Alps ; sl, Alpe . are the highest and most extensive mountain range system that lies entirely in Europe, stretching approximately across seven Alpine countries (from west to east): France, Sw ...

to the

Carpathians The Carpathian Mountains or Carpathians () are a range of mountains forming an arc across Central Europe. Roughly long, it is the third-longest European mountain range after the Ural Mountains, Urals at and the Scandinavian Mountains at . The ...

. It also has a number of isolated occurrences, including the

Vosges The Vosges ( , ; german: Vogesen ; Franconian and gsw, Vogese) are a range of low mountains in Eastern France, near its border with Germany. Together with the Palatine Forest to the north on the German side of the border, they form a single ...

, Jura, Cévennes,

Auvergne Auvergne (; ; oc, label=Occitan, Auvèrnhe or ) is a former administrative region in central France, comprising the four departments of Allier, Puy-de-Dôme, Cantal and Haute-Loire. Since 1 January 2016, it has been part of the new region Auverg ...

Côte d'Or Côte is a British cafe chain founded by Richard Caring, Andy Bassadone, Chris Benians and Nick Fiddler in Wimbledon, London Wimbledon () is a district and town of Southwest London, England, southwest of the centre of London at Charing Cross ...

Plateau de Langres In geology and physical geography, a plateau (; ; ), also called a high plain or a tableland, is an area of a highland consisting of flat terrain that is raised sharply above the surrounding area on at least one side. Often one or more sides ha ...

and the Belgian

Ardennes The Ardennes (french: Ardenne ; nl, Ardennen ; german: Ardennen; wa, Årdene ; lb, Ardennen ), also known as the Ardennes Forest or Forest of Ardennes, is a region of extensive forests, rough terrain, rolling hills and ridges primarily in Be ...

. In the

British Isles The British Isles are a group of islands in the North Atlantic Ocean off the north-western coast of continental Europe, consisting of the islands of Great Britain, Ireland, the Isle of Man, the Inner and Outer Hebrides, the Northern Isles, ...

, it is found only on limestone cliffs on the Gower Peninsula, from

Worm's Head Worm's Head ( cy, Ynys Weryn) is a headland, at Rhossili, part of the City and County of Swansea, Wales. It is the furthest westerly point of the Gower Peninsula. The name Worm's Head is derived from an Old English word 'wyrm' for 'sea serpent'. ...

to Pwlldu Head. It is a lowland species and grows in pockets of soil in damp cracks and crevices in limestone rocks. When it occurs in grassland or in bare soil away from limestone rocks it seldom thrives.

Status in Britain

This plant was first discovered in 1795 in the British Isles, and genetic analysis has shown that the populations in the Gower are quite distinct from those growing in continental Europe, so the plant does seem to be native to Britain. Although its total population is very small, its overall distribution has largely remained stable; plant collectors have removed some plants but the less accessible ones are persisting, although in some sites they have decreased somewhat for reasons that are not clear.

References

External links

* {{Taxonbar, from=Q159598 aizoides Flora of Europe Gower Peninsula Plants described in 1767