BRITAIN’S ELEVEN RAREST NATIVE TREES

Species

Population

Habitat

Threats

Critically endangered

Ley’s Whitebeam Sorbus leyana

About 16 trees in two sites in southern Powys

Carboniferous Limestone Cliffs

Poor regeneration, mining/explorations, limited protection

Sorbus wilmottiana

About 20 trees on both sides of the Avon Gorge in Somerset and Gloucestershire

Woodland margins and cliff edges

Clear felling of habitat, recent reports of illegal collection/cutting down

Welsh Whitebeam Sorbus leptophylla

44 trees in two sites in Powys

Shady crags of carboniferous limestone

Population stable and inaccessible to animals

Endangered

Sorbus bristoliensis

About 100 trees in the Avon Gorge

Carboniferous Limestone in woodland and scrub

Most trees are mature with little natural regeneration

Vulnerable

Sorbus eminens

About 250 trees, mainly in the Avon Gorge, also in the Wye Valley and Somerset

Woodland on carboniferous limestone

Grazing/damage by animals, invasive exotic plants

Arran Service Tree Sorbus pseudofennica

About 500 trees in Glen Diomhan nature reserve in Arran

Scrub on steep granite crags, remnant woodland on stream bank

Grazing/damage by animals, insufficient regeneration

Arran Whitebeam Sorbus arranensis

About 500 trees in two sites in Northern Arran

Woodland on steep slopes and very acidic soils

Insufficient regeneration, grazing/damage by animals

Sorbus subcuneata

Self-cloning; a very small area along Devon and Somerset coasts

Oak Woodlands

Burning/clear felling of habitat

Sorbus vexanns

Self-cloning; coastal area between Culbone in Somerset and Trentishoe in Devon

Along coast and in oak woodland

Invasive exotic plants, inappropriate woodland management

English Whitebeam Sorbus anglica

About 600 trees in Denbigh, Devon, Somerset, Avon Gorge, Wye Valley, Shropshire, Brecon and Montgomery

Carboniferous limestone on woodland edges or in scrub

Well protected in nature reserves and sites of special scientific interest

Lower Risk

Sorbus lancastriensis

About 2390 trees within a 30km radius of Morecambe Bay

Open woodland on carboniferous limestone

Grazing/damage by animals: most sites are protected or inaccessible

Source: World Conservation Monitoring Centre/World Conservation Union