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Species Endemic whitebeams – Sorbus vexans, S subcuneata, S devoniensis, S taxon, plant
Habitat UPLAND OAKWOOD
Background and status All of these members of the Sorbus family are only found in Britain. Small to medium-sized deciduous trees, each has a limited distribution. Sorbus devoniensis, with simple, toothed, leathery leaves, dark glossy green above and white below can be confused with Sorbus subcuneata, a small tree with brownish-orange fruits becoming brown when fully ripe. In fact, a tree at Watersmeet, near Lynton, Devon, usually known as the ‘No Parking’ tree has been identified as both. Commonest in North Devon, the fruits of Sorbus devoniensis were once sold in Barnstaple Market. It also occurs in South Devon, East Cornwall and South-East Ireland. The main habitat of all the species is open woodland (apart from the Devon whitebeam which is largeley a hedgerow species), usually on steep slopes near to the sea or rocky coastal cliffs.

Sorbus vexans and S subcuneata are regarded as vulnerable and S devoniensis is nationally scarce (occuring in 16-100 10km squares in Britain).

Main Threats Loss of hedges, removal of hedgrow trees, too frequent and too close cutting of hedges are a threat to the Devon whitebeam. Invasion of non-native plants, especially rhododendron, but also evergreen oaks in coastal areas such as Torbay, into woodland habitats, leads to competetion with whitebeams. Lack of knowledge of landowners/managers of the species, their locations and habitat requirements.
Conservation and targets

Attain a better understanding of the distribution and size of population of whitebeam species in Devon; ensure a monitoring programme is in place by the year 2000

Increase awareness and understanding of the Devon whitebeam species among land owners/managers, conservationists and the public.

There is a need to ensure sufficient regeneration of seedlings by controlling: excessive scrub on coastal sites; grazing to appropriate areas and/or levels of intensity; invasive species such as rhododendron.

The biology of outlying populations of whitebeams and dispersal mechanisms need researching.