The main habitat on the site is chalk grassland, largely dominated by Upright Brome (Bromus erectus).
Several scarce and notable species occur including Round-headed Rampion (Phyteuma tenerum), Bastard-toadflax (Thesium humifusum), Fly Orchid (Ophrys insectifera), Fragrant Orchid (Gymnadenia conopsea), Lesser Butterfly Orchid (Platanthera bifolia), Frog orchid(Coeloglossum viride), Musk orchid (Herminium monorchis) and unusually, for a downland site, Marsh Helleborine (Epipactis palustris).
- English Nature citation sheet for the site (accessed 14 August 2006)
- English Nature website (SSSI information)
- Wiltshire Wildlife Trust's page about Morgan's Hill
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