Allerthorpe Common is a Site of Special Scientific Interest

Site of Special Scientific Interest

A Site of Special Scientific Interest is a conservation designation denoting a protected area in the United Kingdom. SSSIs are the basic building block of site-based nature conservation legislation and most other legal nature/geological conservation designations in Great Britain are based upon...

 (SSSI) and nature reserve

Nature reserve

A nature reserve is a protected area of importance for wildlife, flora, fauna or features of geological or other special interest, which is reserved and managed for conservation and to provide special opportunities for study or research...

 in the East Riding of Yorkshire

East Riding of Yorkshire

The East Riding of Yorkshire, or simply East Yorkshire, is a local government district with unitary authority status, and a ceremonial county of England. For ceremonial purposes the county also includes the city of Kingston upon Hull, which is a separate unitary authority...

, England. It is located close to the town of Pocklington

Pocklington

Pocklington is a small market town and civil parish situated at the foot of the Yorkshire Wolds in the East Riding of Yorkshire, England, approximately east of York....

. The site, which was designated a SSSI in 1951, lies on river and lake sands, which were deposited during the last glacial period 12-10,000 years ago. The soils are acidic and a variety of habitats, including wet and dry heath, mire, grassland and woodland have formed.
The drier areas are dominated by heather interspersed with cross-leaved heath

Erica tetralix

Erica tetralix is a species of heather found in Atlantic areas of Europe, from southern Portugal to central Norway, as well as a number of boggy regions further from the coast in Central Europe. In bogs, wet heaths and damp coniferous woodland, Erica tetralix can become a dominant part of the flora...

 and purple moor grass

Purple Moor Grass

Molinia caerulea is a perennial grass native to Europe, west Asia, and north Africa. It grows in locations from the lowlands up to 2,300 m in the Alps. Like most grasses, it grows best in acid soils, ideally pH values of between 3.5 and 5, however, it can continue to live under more extreme...

. In the wetter areas purple moor grass forms dense tussocks. Common cottongrass

Common Cottongrass

Common Cottongrass is a plant from the sedge family, so even though it looks like a form of grass, technically it is not. It grows in acidic wetlands and peat bogs all over northern parts of Europe, Asia and North America...

 and marsh cinquefoil occur in the wet mire

Miré

Miré is a commune in the Maine-et-Loire department in western France....

conditions.