Deacon Hill SSSI is a biological

Site of Special Scientific Interest A Site of Special Scientific Interest (SSSI) in Great Britain or an Area of Special Scientific Interest (ASSI) in the Isle of Man and Northern Ireland is a conservation designation denoting a protected area in the United Kingdom and Isle of ...

in Pegsdon in

Bedfordshire Bedfordshire (; abbreviated Beds) is a ceremonial county in the East of England. The county has been administered by three unitary authorities, Borough of Bedford, Central Bedfordshire and Borough of Luton, since Bedfordshire County Council wa ...

. It is in the Chilterns Area of Outstanding Natural Beauty, and it is part of the Pegsdon Hills and Hoo Bit nature reserve, managed by Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire. The site is

calcareous Calcareous () is an adjective meaning "mostly or partly composed of calcium carbonate", in other words, containing lime or being chalky. The term is used in a wide variety of scientific disciplines. In zoology ''Calcareous'' is used as an adje ...

grassland which is rich in plant species, some of which are uncommon. Birds include lapwings and buzzards, and there are butterflies such as dingy and grizzled skippers. There are also the remains of ancient

strip lynchet A lynchet or linchet is an earth terrace found on the side of a hill. Lynchets are a feature of ancient field systems of the British Isles. They are commonly found in vertical rows and more commonly referred to as "strip lynchets". Lynchets appe ...

fields. The SSSI covers part of Deacon Hill and part of the adjacent Pegsdon Hills. This is a remnant of semi-natural chalk downland and the calcareous soil supports a characteristic range of grasses and herbs. The main grasses present are sheep’s fescue,

false oat-grass ''Arrhenatherum elatius'', with the common names bulbous oat grass, false oat-grass, tall oat-grass, tall meadow oat, onion couch and tuber oat-grass, is a species of perennial grass, native to Europe, western Asia, and northern Africa. This bun ...

and upright brome. Forbs found here include spring sedge,

autumn gentian ''Gentianella amarella'', the autumn gentian, autumn dwarf gentian, or autumn felwort, is a short biennial plant flowering plant in the gentian family, Gentianaceae. It is found throughout Northern Europe, the western and northern United States ...

yellow-wort ''Blackstonia perfoliata'' or yellow-wort is a species of flowering plant in the family Gentianaceae found around the Mediterranean Basin, but extending into northwestern Europe. Description Yellow-wort grows tall, with stiff, branching stems. ...

fragrant orchid ''Gymnadenia conopsea'', commonly known as the fragrant orchid or chalk fragrant orchid, is a herbaceous plant of the family Orchidaceae native to northern Europe. Etymology The name of the genus ''Gymnadenia'' is formed from Greek words (', ...

common spotted-orchid ''Dactylorhiza fuchsii'', the common spotted orchid, is a species of flowering plant in the orchid family Orchidaceae. ''Dactylorhiza fuchsii'' is one of Europe's commonest wild orchids. It is widespread across much of Europe, with the range ext ...

common milkwort Common milkwort is a common name for several plants and may refer to: *'' Polygala sanguinea'', native to eastern North America *''Polygala vulgaris ''Polygala vulgaris'', known as the common milkwort, is a herbaceous perennial plant of the genu ...

common rock-rose ''Helianthemum nummularium'' (known as common rock-rose) is a species of rock-rose (Cistaceae), native to most of Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical si ...

, cowslip, eyebright,

clustered bellflower ''Campanula glomerata'', known by the common names clustered bellflower or Dane's blood, is a species of flowering plant in the genus '' Campanula'', belonging to the family Campanulaceae. It is the county flower of Rutland, England. Etymology ...

harebell ''Campanula rotundifolia'', the harebell, Scottish bluebell, or bluebell of Scotland, is a species of flowering plant in the bellflower family Campanulaceae. This herbaceous perennial is found throughout the temperate regions of the northern hemi ...

carline thistle ''Carlina vulgaris'', the carline thistle, is a plant species of the genus '' Carlina''. It is a biennial that grows on limestone, chalky or other alkaline grasslands or dunes. The flowers are clusters of very small brown florets surrounded by br ...

, wild thyme,

marjoram Marjoram (; ''Origanum majorana'') is a cold-sensitive perennial herb or undershrub with sweet pine and citrus flavours. In some Middle Eastern countries, marjoram is synonymous with oregano, and there the names sweet marjoram and knotted mar ...

and moschatel. There are also wild candytuft,

field fleawort ''Tephroseris integrifolia'' (vernacular name: field fleawort) is a species of flowering plant belonging to the family Asteraceae. Its native range is Europe to Siberia Siberia ( ; rus, Сибирь, r=Sibir', p=sʲɪˈbʲirʲ, a=Ru-Сиб ...

and

pasque flower The genus ''Pulsatilla'' contains about 40 species of herbaceous perennial plants native to meadows and prairies of North America, Europe, and Asia. Derived from the Hebrew word for Passover, "pasakh", the common name pasque flower refers to th ...

, all of which are rare in Bedfordshire. There is also some scrubland, the main trees being

hawthorn Hawthorn or Hawthorns may refer to: Plants * '' Crataegus'' (hawthorn), a large genus of shrubs and trees in the family Rosaceae * ''Rhaphiolepis'' (hawthorn), a genus of about 15 species of evergreen shrubs and small trees in the family Rosace ...

, which often invades chalk downland, a

buckthorn ''Rhamnus'' is a genus of about 110 accepted species of shrubs or small trees, commonly known as buckthorns, in the family Rhamnaceae. Its species range from tall (rarely to ) and are native mainly in east Asia and North America, but found thr ...

and

wayfaring tree ''Viburnum lantana'', the wayfarer or wayfaring tree, is a species of ''Viburnum'', native to central, southern and western Europe (north to Yorkshire in England), northwest Africa, and southwestern Asia.Blamey, M. & Grey-Wilson, C. (1989). ''Flo ...

, with

black bryony ''Dioscorea communis'' or ''Tamus communis'' is a species of flowering plant in the yam family Dioscoreaceae and is commonly known as black bryony, lady's-seal or black bindweed. Description It is a climbing herbaceous plant growing to 2–4 m ...

and

old man's beard Old man's beard may refer to the following: * ''Chionanthus virginicus'', a tree, which is used like a medicinal plant and ornamental plant. * ''Clematis aristata'', an Australian climbing plant. * ''Clematis vitalba'', a climbing plant. * ''Tillan ...

; false-brome usually dominates the ground flora in scrubby areas. There are

glowworm Glowworm or glow-worm is the common name for various groups of insect larvae and adult larviform females that glow through bioluminescence. They include the European common glow-worm and other members of the Lampyridae, but bioluminescence also o ...

s, and

grizzled skipper ''Pyrgus'' is a genus in the skippers butterfly family, Hesperiidae, known as the grizzled skippers. The name "checkered" or "chequered skipper" may also be applied to some species, but also refers to species in the genera '' Burnsius'' and '' ...

and

dingy skipper The Dingy Skipper (''Erynnis tages'') is a butterfly of the family Hesperiidae. Description ''Erynnis tages'' is different from other skippers because of the predominantly monochrome, gray-brown wing coloration and the marbling, which is only ...

butterflies. There is access to the site from Hitchin Road.

References

{{SSSIs Bedfordshire Sites of Special Scientific Interest in Bedfordshire Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire reserves