Caeau Cwm-Ffrwd

Site of Special Scientific Interest · 52.4789, -3.4122

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Powys County

Description

Description This site comprises a series of small fields situated on gently sloping ground at the head of a west-facing valley near Llandinam. They support a type of species-rich plant community typical of traditionally managed hay meadows associated with the free draining neutral soils of the upland fringe. Such meadows are now rare in mid- Wales as a result of agricultural intensification. Much of the sward is dominated by common bent Agrostis capillaris, sweet vernal-grass Anthoxanthum odoratum, crested dogs-tail Cynosurus cristatus and red fescue Festuca rubra, with frequent common knapweed Centaurea nigra, eyebright Euphrasia officinalis, autumn hawkbit Scorzoneroides autumnalis, common birds-foot-trefoil Lotus corniculatus, ribwort plantain Plantago lanceolata, meadow buttercup Ranunculus acris, bulbous buttercup Ranunculus bulbosus, common sorrel Rumex acetosella and red clover Trifolium pratense. Other associated species include perennial rye-grass Lolium perenne, pignut Conopodium majus, heath spotted-orchid Dactylorhiza maculata subsp. Ericetorum, oxeye daisy Leucanthemum vulgare, rough hawkbit Leontodon hispidus, yellow-rattle Rhinanthus minor and tufted vetch Vicia cracca. Near the farm buildings nutrient enrichment and poaching has occurred. The sward here is characterised by an abundance of perennial rye-grass and crested dogs-tail, along with species such as creeping buttercup Ranunculus repens and white clover Trifolium repens.

Species mentioned

English name
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Latin name
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IUCN / Red List Type Family
common bent Agrostis capillaris LC grass poaceae
sweet vernal grass Anthoxanthum odoratum LC grass poaceae
crested dog's tail Cynosurus cristatus LC grass poaceae
red fescue Festuca rubra LC grass poaceae
perennial rye-grass Lolium perenne LC grass poaceae
black knapweed Centaurea nigra LC herb asteraceae
pignut Conopodium majus LC herb apiaceae
heath spotted orchid Dactylorhiza maculata LC herb orchidaceae
English sticky eyebright Euphrasia officinalis LC herb orobanchaceae
rough hawkbit Leontodon hispidus LC herb asteraceae
oxeye daisy Leucanthemum vulgare LC herb asteraceae
birdsfoot trefoil Lotus corniculatus LC herb fabaceae
ribwort plantain Plantago lanceolata LC herb plantaginaceae
meadow buttercup Ranunculus acris DD herb ranunculaceae
bulbous buttercup Ranunculus bulbosus LC herb ranunculaceae
creeping buttercup Ranunculus repens LC herb ranunculaceae
yellow-rattle Rhinanthus minor DD herb orobanchaceae
sheep's sorrel Rumex acetosella NT herb polygonaceae
greater hawkbit Scorzoneroides autumnalis LC herb asteraceae
red clover Trifolium pratense LC herb fabaceae
white clover Trifolium repens LC herb fabaceae
tufted vetch Vicia cracca LC herb fabaceae

Insects to look out for

These moths, butterflies and beetles are known to feed on plants recorded at this site, and carry a notable UK conservation status — but a host-plant being present doesn't mean the insect has actually been recorded here. Treat this as "worth watching for," not a confirmed sighting.

SpeciesStatusVia host-plant
Black-veined moth
Siona lineata
Critically Endangered Centaurea nigra, Lotus corniculatus
New forest
Zygaena viciae
Critically Endangered Lotus corniculatus
Straw belle
Aspitates gilvaria
Endangered Lotus corniculatus
Marsh moth
Athetis pallustris
Endangered Plantago lanceolata
Wood white
Leptidea sinapis
Endangered Lotus corniculatus, Vicia cracca
Scarce blackneck
Lygephila craccae
Endangered Vicia cracca
Heath fritillary
Melitaea athalia
Endangered Plantago lanceolata
Glanville fritillary
Melitaea cinxia
Endangered Plantago lanceolata
Fiery clearwing
Pyropteron chrysidiformis
Endangered Rumex acetosella
Slender scotch
Zygaena loti
Endangered Lotus corniculatus
Mouse moth
Amphipyra tragopoginis
Vulnerable Lotus corniculatus
Broom moth
Ceramica pisi
Vulnerable Rumex spp.
Dingy skipper
Erynnis tages
Vulnerable Lotus corniculatus
Marsh fritillary
Euphydryas aurinia
Vulnerable Plantago spp.
Satyr pug
Eupithecia satyrata
Vulnerable Centaurea spp., Rhinanthus minor
Garden dart
Euxoa nigricans
Vulnerable Plantago spp., Rumex spp., Trifolium spp.
Grayling
Hipparchia semele
Vulnerable Festuca rubra
Silver studded blue
Plebejus argus
Vulnerable Lotus corniculatus
Beaded chestnut
Agrochola lychnidis
Near Threatened Ranunculus spp., Rumex spp., Trifolium spp.
Grey chi
Antitype chi
Near Threatened Plantago lanceolata, Rumex spp.
Garden tiger
Arctia caja
Near Threatened Plantago spp., Rumex spp.
Latticed heath
Chiasmia clathrata
Near Threatened Trifolium repens, Trifolium spp., Vicia cracca
The sallow
Cirrhia icteritia
Near Threatened Rumex spp.
Small heath
Coenonympha pamphilus
Near Threatened Agrostis spp., Cynosurus cristatus, Festuca spp.
Autumnal rustic
Eugnorisma glareosa
Near Threatened Plantago spp., Rumex spp.
Grey pug
Eupithecia subfuscata
Near Threatened Centaurea spp.
Scarce forester
Jordanita globulariae
Near Threatened Centaurea nigra
Wall
Lasiommata megera
Near Threatened Agrostis spp.
The blackneck
Lygephila pastinum
Near Threatened Vicia cracca
Dark-barred twin-spot carpet
Xanthorhoe ferrugata
Near Threatened Rumex spp.

Host-plant data: Cook et al. (2025), Traits data for the butterflies and macro-moths of Great Britain and Ireland, 2024, UK Centre for Ecology & Hydrology / Butterfly Conservation; and Padovani et al. (2020), Database of Insects and their Food Plants (DBIF), UK Centre for Ecology & Hydrology (both Open Government Licence). Contains data supplied by UK Centre for Ecology & Hydrology.