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Toadflax-leaved St John's-wort

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Scientific name: Hypericum linariifolium
Toadflax-leaved St John's-wort has star-shaped, bright yellow flowers. It is a rare plant, with most of its population existing on Dartmoor. It likes steep, sunny slopes, acidic soils and plenty of space.

Top facts


Height: up to 65cm

Conservation status

Classified as Near Threatened on the Vascular Plant Red Data List for Great Britain.

When to see

June to July


Toadflax-leaved St John's-wort is a fussy plant that has very particular habitat requirements, explaining its rarity and limited range. It needs plenty of space, with few competitors nearby, and acidic soils in warm areas. Steep, rocky slopes exposed to the sun are a favourite. It is a perennial species and flowers between June and July.

What to look for

Toadflax-leaved St John's-wort is one of a number of similar species: look for reddish stems, and long, thin leaves that grow from opposite sides of the stalk. Star-shaped flowers are bright yellow and delicately dotted at the edges with tiny, black glands.

Where to find

Very rare and restricted to Devon and Cornwall, West Wales and the Channel Islands.

Did you know?

Most of the UK's population of Toadflax-leaved St John's-wort (also known as 'Flax-leaved St John's-wort') can be found on Dartmoor.