Erica tetralix
Additionally, land around a north-eastern tributary of the Eastern Cleddau, Gweunydd Blaencleddau, is designated as a Special Area of Conservation for habitats including: calcium-rich springwater-fed fens - Alkaline fens; the southern damselfly ("Coenagrion mercuriale"), marsh fritillary butterfly "Euphydryas (Eurodryas, Hypodryas) aurinia"; purple moor-grass meadows - molinia meadows on calcareous, peaty or clayey-silt-laden soils ("Molinion caeruleae"); wet heathland with cross-leaved heath "Rhostiroedd gwlyb" – Northern Atlantic wet heaths with "Erica tetralix"; very wet mires often identified by an unstable 'quaking' surface – transition mires and quaking bogs; and blanket bogs.