Date of Issue: 19 May 2009
Country: Great Britain
Denominations:1st x 10
Round-Headed Leek (Allium sphaerocephalon) was first discovered in 1847, in the Avon Gorgenear Bristol. It has since been introduced in a very few, scattered locations.
Floating Water-Plantain (Luronium natans) spread eastwards from its core natural habitats in the lakes of Snowdonia and mid Wales in the 19th century, taking advantage of the canal network. In recent decades, however, pollution and recreational boating have led to its disappearance from many lowland waterways.
Lady's Slipper Orchid (Cypripedium calceolus) has the misfortune to qualify as one of Britain’s rarest plant, having been reduced in the wild to a single specimen in West Yorkshire. Over-grazing, and centuries of over-collecting by gardeners and botanists are to blame for its virtual extinction in Britain.
Dwarf Milkwort (Polygala amarella), long known from the chalk grasslands of the North Downs in Kent and the limestone grasslands of Yorkshire, has declined in recent years, particularly in Kent.
Marsh Saxifrage (Saxifraga hirculus), a rare wild flower of wet moorland and mountain bogs, is now reduced to a few localities, chiefly in the northern Pennines and north-east Scotland, with recent losses attributed to land drainage, over-grazing or afforestation.
Downy woundwort (Stachys germanica) may once have been more widespread, but declined markedly in the 19th century, and is now confined to a small area of Oxfordshire, where it grows mostly along the verges of ancient green lanes and wood borders overlying oolitic limestone.
Upright Spurge (Euphorbia serrulata) is found mostly in a few woodlands in Gloucestershire and Monmouthshire. Cessation of tree cutting and coppicing, which traditionally created well-lit clearings, is probably to blame for its decline.
Plymouth Pear (Pyrus cordata) is a British wild pear that was discovered in 1865 in hedge-banks outside the city of Plymouth. Today, only a few hundred trees exist, in just seven locations.
Sea Knotgrass (Polygonum maritimum) grows just above the high-tide level in a few places along the southern coast of England and Ireland. A Mediterranean species on the edge of its range in southern Britain, it is vulnerable to exceptional tides.
Deptford Pink (Dianthus armeria) was once widespread, but over the past 60 years it has suffered one of the most rapid declines of any species in the British flora, as the dry pastures, field borders and hedgerows it needs have steadily disappeared. It is now restricted to about two dozen sites in England and Wales.