Penmaen
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Geology & landscape
Geological Feature: Rock Outcrop
Description
Description The site consists of an elevated south-facing dry acidic rocky outcrop with grassy ledges. It is notable for the presence of flax-leaved St. John’s-wort Hypericum linariifolium in its only Welsh locality and its most northerly station in Britain. Nationally, it is only known from five additional localities all in South West England.
Species mentioned
Show the 1 species mentioned in the description, with red-list status| English name search for this in other sites |
Latin name search with Google |
IUCN / Red List | Type | Family |
|---|---|---|---|---|
| toadflax-leaved St John's-wort | Hypericum linariifolium | NT | herb | hypericaceae |
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.
| Species | Status | Via host-plant |
|---|---|---|
| Satyr pug Eupithecia satyrata |
Vulnerable | Hypericum 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.