Holies Down

Site of Special Scientific Interest · 51.5145, -1.1453

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Berkshire County North Wessex Downs Scenic Area

Condition (Natural England)

Favourable (1)
UnitFeatureConditionArea (ha)Assessed
SU594798 — Favourable 5.62 2017-08-11

Habitats

Arable

Geology & landscape

Geological Feature: Rock Outcrop · Rock Type: Chalk

Description

Description The site comprises an area of unimproved chalk grassland, a habitat now becoming increasingly rare in Berkshire. This is grazed and supports a large number of species of flowering plants in close association. About 180 hectares of chalk grassland remains in Berkshire, equal to less than 0.5 percent of the chalk outcrop in the county. Holies Down lies at the eastern end of the Berkshire / Oxfordshire Downs, an extensive area of chalk downland, now largely converted to intensive arable farming. In southern England generally, chalk grassland has also diminished, due mainly to agricultural improvement since the war. Glaucous sedge Carex flacca is abundant over much of the site, forming a short turf with fine leaved grasses such as red and sheep's fescue Festuca rubra and Festuca ovina, quaking grass Briza media and yellow oat grass Trisetum flavescens. Coarser grasses include upright brome Bromus erectus and tor grass Brachypodium pinnatum, two species characteristic of chalk downland, which are locally common over the site. Fewer grasses occur on the steeper south east facing slopes where grazing has promoted the diversity of chalk flowers. Most abundant species are stemless thistle Cirsium acaule, eyebright Euphrasia nemorosa, mouse ear hawkweed Pilosella officinarum, rough hawkbit Leontodon hispidus, fairy flax Linum catharticum, salad burnet Poterium sanguisorba and ragwort Jacobaea vulgaris. Species which are locally abundant or generally common over the site include common spotted orchid Dactylorhiza fuchsii, autumn gentian Gentianella amarella, wild thyme Thymus praecox, hairy violet Viola hirta, squinancywort Asperula cynanchica, small scabious Scabiosa columbaria, hawkweed ox tongue Picris hieracioides and rest harrow Ononis repens. Many of the species which occur are characteristic of agriculturally unimproved calcareous grasslands and in southern England may often be restricted to this type of habitat. Other species in this category which occur at Holies Down include common rock rose Helianthemum nummularium, yellow wort Blackstonia perfoliata and pyramidal orchid Anacamptis pyramidalis. The diversity of flowering plants in chalk grassland provides important food and nectar sources for insects. Because of its south facing and sheltered aspect, Holies Down is likely to be important for groups of insects such as bees, grasshoppers and butterflies which thrive in warm conditions.

Species mentioned

English name
search for this in other sites		 Latin name
search with Google		 IUCN / Red List Type Family
tor grass Brachypodium pinnatum LC grass poaceae
quaking grass Briza media VU grass poaceae
upright brome Bromus erectus Not listed in GB list grass poaceae
sheep's fescue Festuca ovina LC grass poaceae
red fescue Festuca rubra LC grass poaceae
yellow oat grass Trisetum flavescens LC grass poaceae
pyramidal orchid Anacamptis pyramidalis LC herb orchidaceae
squinancywort Asperula cynanchica VU herb rubiaceae
yellowwort Blackstonia perfoliata LC herb gentianaceae
dwarf thistle Cirsium acaule VU herb asteraceae
spotted orchids Dactylorhiza fuchsii LC herb orchidaceae
common eyebright Euphrasia nemorosa LC herb orobanchaceae
autumn gentian Gentianella amarella LC herb gentianaceae
rock roses Helianthemum nummularium VU herb cistaceae
ragwort Jacobaea vulgaris LC herb asteraceae
rough hawkbit Leontodon hispidus LC herb asteraceae
fairy flax Linum catharticum LC herb linaceae
common rest-harrow Ononis repens VU herb fabaceae
hawkweed ox-tongue Picris hieracioides LC herb asteraceae
mouse_ear hawkweed Pilosella officinarum LC herb asteraceae
salad burnet Poterium sanguisorba VU herb rosaceae
small scabious Scabiosa columbaria LC herb caprifoliaceae
creeping thyme Thymus praecox Not listed in GB list herb lamiaceae
hairy violet Viola hirta LC herb violaceae
glaucus sedge Carex flacca LC sedge cyperaceae

Plant communities

OV3 — Arable, Open habitat arable weed less fertile acid, Pond ditch and canal

Papaver rhoeas-Viola arvensis community

Bryum erythrocarpum, Phascum cuspidatum, Heracleum sphondylium, Achillea millefolium, Anthemis arvensis, Artemisia vulgaris, Cirsium arvense, Eupatorium cannabinum, Matricaria discoidea, Pulicaria dysenterica, Senecio vulgaris, Sonchus asper, Sonchus oleraceus, Taraxacum officianalis, Tripleurospermum inodorum, Anchusa arvensis, Myosotis arvensis, Arabidopsis thaliana, Capsella bursa-pastoris, Descurainia sophia, Sisymbrium officinale, Valerianella locusta, Arenaria leptoclados, Arenaria serpyllifolia, Silene latifolia, Spergula arvensis, Stellaria media agg., Chenopodium album, Convolvulus arvensis, Medicago lupulina, Trifolium repens, Vicia sativa, Geranium dissectum, Epilobium hirsutum, Papaver argemone, Papaver dubium, Veronica arvensis, Veronica persica, Veronica triphyllos, Fallopia convolvulus, Polygonum aviculare, Rumex crispus, Anagallis arvensis, Aphanes microcarpa, Galium aparine, Urtica dioica, Viola arvensis, Agrostis stolonifera, Elytrigia repens, Poa annua, Poa trivialis, Chara vulgaris

OV4 — Arable

Chrysanthemum segetum-Spergula arvensis community

Bryum rubens, Daucus carota, Artemisia vulgaris, Bellis perennis, Cirsium arvense, Cirsium vulgare, Crepis capillaris, Filaginella uliginosa, Glebionis segetum, Matricaria discoidea, Senecio vulgaris, Sonchus asper, Taraxacum officianalis, Tripleurospermum inodorum, Anchusa arvensis, Myosotis arvensis, Brassica rapa, Capsella bursa-pastoris, Lepidium didymum, Raphanus raphanistrum, Cerastium fontanum, Cerastium glomeratum, Spergula arvensis, Stellaria media agg., Euphorbia helioscopia, Trifolium dubium, Trifolium repens, Vicia sativa, Fumaria muralis, Geranium dissectum, Galeopsis tetrahit, Lamium purpureum, Stachys arvensis, Plantago major, Veronica agrestis, Veronica arvensis, Fallopia convolvulus, Persicaria maculosa, Polygonum aviculare, Rumex acetosella, Rumex crispus, Anagallis arvensis, Ranunculus repens, Potentilla anserina, Misopates orontium, Solanum nigrum, Viola arvensis, Agrostis capillaris, Agrostis stolonifera, Dactylis glomerata, Elytrigia repens, Holcus lanatus, Lolium multiflorum, Lolium perenne, Poa annua, Poa trivialis

OV7 — Arable, Open habitat arable weed fertile loam and clay

Veronica persica-Veronica polita community

Aethusa cynapium, Cirsium arvense, Conyza canadensis, Matricaria discoidea, Senecio vulgaris, Sonchus asper, Sonchus oleraceus, Tripleurospermum inodorum, Capsella bursa-pastoris, Diplotaxis muralis, Erucastrum gallicum, Lepidium coronopus, Sisymbrium officinale, Thlaspi arvense, Stellaria media agg., Atriplex patula, Atriplex prostrata, Chenopodium album, Euphorbia helioscopia, Euphorbia peplus, Lamium amplexicaule, Lamium hybridum, Lamium purpureum, Plantago lanceolata, Plantago major, Veronica persica, Veronica polita, Fallopia convolvulus, Polygonum aviculare, Anagallis arvensis, Ranunculus repens, Galium aparine, Solanum nigrum, Urtica urens, Viola arvensis, Agrostis stolonifera, Avena fatua, Elytrigia repens, Poa annua, Aphanes arvensis, Chara vulgaris

OV8 — Arable, Open habitat arable weed fertile loam and clay

Veronica persica-Alopecurus myosuroides community

Aethusa cynapium, Anthemis cotula, Cirsium arvense, Lapsana communis, Matricaria chamomilla, Matricaria discoidea, Senecio vulgaris, Sonchus arvensis, Sonchus asper, Sonchus oleraceus, Tripleurospermum inodorum, Capsella bursa-pastoris, Lepidium coronopus, Sinapis arvensis, Sisymbrium officinale, Stellaria media agg., Atriplex patula, Atriplex prostrata, Chenopodium album, Chenopodium hybridum, Convolvulus arvensis, Euphorbia helioscopia, Euphorbia peplus, Trifolium repens, Geranium dissectum, Lamium purpureum, Plantago major, Veronica persica, Fallopia convolvulus, Persicaria maculosa, Polygonum aviculare, Rumex crispus, Galium aparine, Solanum nigrum, Urtica dioica, Urtica urens, Alopecurus myosuroides, Avena fatua, Elytrigia repens, Poa annua, Chara vulgaris

OV9 — Arable, Open habitat arable weed fertile loam and clay

Matricaria perforata-Stellaria media community

Juncus bufonius, Bryum rubens, Dicranella staphylina, Kindbergia praelonga, Barbula unguiculata, Phascum cuspidatum, Tortula intermedia, Riccia sorocarpa, Artemisia vulgaris, Cirsium arvense, Crepis capillaris, Filaginella uliginosa, Glebionis segetum, Lapsana communis, Matricaria discoidea, Senecio vulgaris, Sonchus arvensis, Sonchus asper, Taraxacum officianalis, Tripleurospermum maritimum, Tussilago farfara, Anchusa arvensis, Myosotis arvensis, Capsella bursa-pastoris, Raphanus raphanistrum, Sisymbrium officinale, Cerastium fontanum, Stellaria media agg., Atriplex patula, Atriplex prostrata, Chenopodium album, Equisetum arvense, Mercurialis annua, Trifolium pratense, Trifolium repens, Fumaria officinalis, Geranium molle, Galeopsis tetrahit, Lamium hybridum, Lamium purpureum, Chamerion angustifolium, Epilobium montanum, Papaver dubium, Plantago lanceolata, Plantago major, Veronica arvensis, Veronica persica, Fallopia convolvulus, Persicaria maculosa, Polygonum arenastrum, Polygonum aviculare, Rumex acetosella, Rumex crispus, Rumex obtusifolius, Anagallis arvensis, Ranunculus arvensis, Potentilla anserina, Sherardia arvensis, Misopates orontium, Solanum nigrum, Urtica dioica, Viola arvensis, Agrostis capillaris, Agrostis stolonifera, Anisantha sterilis, Arrhenatherum elatius, Dactylis glomerata, Elytrigia repens, Holcus lanatus, Holcus mollis, Hordeum vulgare, Lolium perenne, Poa annua, Poa trivialis, Aphanes arvensis, Chara vulgaris

OV10 — Arable, Open habitat arable weed fertile loam and clay

Poa annua-Senecio vulgaris community

Bryum argenteum, Heracleum sphondylium, Achillea millefolium, Anthemis cotula, Arctium minus, Cirsium arvense, Cirsium vulgare, Jacobaea vulgaris, Lapsana communis, Leucanthemum vulgare, Matricaria chamomilla, Matricaria discoidea, Senecio squalidus, Senecio vulgaris, Sonchus asper, Sonchus oleraceus, Taraxacum officianalis, Tripleurospermum inodorum, Tussilago farfara, Myosotis arvensis, Alliaria petiolata, Capsella bursa-pastoris, Erophila verna, Lepidium coronopus, Raphanus raphanistrum, Sinapis arvensis, Cerastium fontanum, Spergula arvensis, Stellaria media agg., Atriplex prostrata, Chenopodium album, Euphorbia exigua, Euphorbia helioscopia, Medicago lupulina, Trifolium pratense, Trifolium repens, Vicia sativa, Fumaria officinalis, Eriodium cicutarium, Lamium hybridum, Lamium purpureum, Chamerion angustifolium, Plantago lanceolata, Plantago major, Plantago media, Veronica arvensis, Veronica chamaedrys, Veronica persica, Veronica polita, Fallopia convolvulus, Persicaria maculosa, Polygonum arenastrum, Polygonum aviculare, Rumex acetosa, Rumex crispus, Rumex obtusifolius, Anagallis arvensis, Ranunculus repens, Galium aparine, Urtica dioica, Urtica urens, Viola arvensis, Agrostis capillaris, Agrostis stolonifera, Anisantha sterilis, Dactylis glomerata, Elytrigia repens, Festuca ovina, Holcus lanatus, Lolium perenne, Poa annua, Poa pratensis, Poa trivialis, Aphanes arvensis

OV11 — Arable, Open habitat arable weed fertile loam and clay

Poa annua-Stachys arvensis community

Bryum erythrocarpum, Dicranella staphylina, Pleuridium subulatum, Brachythecium rutabulum, Kindbergia praelonga, Tortula truncata, Daucus carota, Glebionis segetum, Matricaria discoidea, Scorzoneroides autumnalis, Senecio sylvaticus, Senecio vulgaris, Sonchus arvensis, Sonchus asper, Taraxacum officianalis, Tripleurospermum inodorum, Capsella bursa-pastoris, Lepidium didymum, Sinapis arvensis, Cerastium fontanum, Cerastium glomeratum, Spergula arvensis, Stellaria media agg., Atriplex patula, Chenopodium album, Euphorbia exigua, Euphorbia helioscopia, Trifolium dubium, Trifolium repens, Fumaria bastardii, Fumaria muralis, Geranium dissectum, Lamium purpureum, Stachys arvensis, Kickxia elatine, Plantago lanceolata, Plantago major, Veronica arvensis, Veronica persica, Fallopia convolvulus, Persicaria maculosa, Polygonum aviculare, Polygonum lapathifolium, Rumex crispus, Rumex obtusifolius, Anagallis arvensis, Ranunculus repens, Aphanes microcarpa, Potentilla anserina, Sherardia arvensis, Misopates orontium, Solanum nigrum, Viola arvensis, Agrostis capillaris, Agrostis stolonifera, Elytrigia repens, Holcus lanatus, Lolium perenne, Poa annua, Poa trivialis, Aphanes arvensis

OV13 — Arable, Open habitat arable weed fertile loam and clay

Stellaria media-Capsella bursa-pastoris community

Arctium minus, Cirsium arvense, Cirsium vulgare, Matricaria discoidea, Senecio vulgaris, Sonchus arvensis, Sonchus asper, Sonchus oleraceus, Tripleurospermum inodorum, Tripleurospermum maritimum, Brassica napus, Capsella bursa-pastoris, Lepidium coronopus, Sinapis arvensis, Sisymbrium officinale, Thlaspi arvense, Spergula arvensis, Stellaria media agg., Atriplex patula, Atriplex prostrata, Chenopodium album, Chenopodium bonus-henricus, Chenopodium rubrum, Chenopodium urbicum, Calystegia sepium, Convolvulus arvensis, Euphorbia helioscopia, Euphorbia peplus, Mercurialis annua, Trifolium repens, Fumaria bastardii, Fumaria muralis, Geranium dissectum, Lamium album, Lamium hybridum, Lamium purpureum, Plantago major, Veronica agrestis, Veronica persica, Veronica polita, Fallopia convolvulus, Persicaria maculosa, Polygonum aviculare, Polygonum lapathifolium, Rumex crispus, Rumex obtusifolius, Galium aparine, Solanum nigrum, Urtica dioica, Urtica urens, Agrostis stolonifera, Alopecurus myosuroides, Anisantha sterilis, Avena fatua, Elytrigia repens, Lolium perenne, Poa annua, Poa pratensis, Chara vulgaris