West Yatton Down

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West Yatton Down (grid reference ST852760) is a 14.4 hectare biological Site of Special Scientific Interest in Wiltshire, notified in 1971.

The site is an example of unimproved limestone grassland. Among the more notable plants species are bastard-toadflax (Thesium humifusum), Dyer's greenweed (Genista tinctoria), and musk orchid (Herminium monorchis). Other species present include yellow-wort (Blackstonia perfoliata), kidney vetch (Anthyllis vulneraria), devil's-bit scabious (Succisa pratensis), bee orchid (Ophrys apifera), tor-grass (Brachypodium pinnatum) and upright brome (Bromus erectus).

The site is also of interest for invertebrates. Twenty-five butterfly species have been recorded, including chalkhill blue, Duke of Burgundy, pearl-bordered fritillary and green hairstreak.

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Coordinates: 51°28′58″N 2°12′52″W / 51.48276°N 2.21452°W / 51.48276; -2.21452