Adder's-tongue Spearwort

Ranunculus ophioglossifolius
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
Order:	Ranunculales
Family:	Ranunculaceae
Genus:	Ranunculus
Species:	R. ophioglossifolius
Binomial name
Ranunculus ophioglossifolius Vill.

Ranunculus ophioglossifolius, known as adder's-tongue spearwort, is a herbaceous plant in the family Ranunculaceae ("buttercup family"), with small, bright yellow, buttercup-like flowers.

Ranunculus ophioglossifolius is found widely in southern Europe (especially in Sardinia), North Africa (including Macaronesia) and western Asia. In 1957, it was introduced to New Zealand. In the British Isles, it is now restricted to two sites, and in Scandinavia, it is only found at a few sites on the island of Gotland.

Also known as the "Badgeworth buttercup", this plant has been the subject of considerable conservation effort from Gloucestershire Wildlife Trust and Plantlife. It is currently found in only two sites in the UK (Badgeworth and Inglestone Common), making it one of the rarest species of the country.

A historical timeline is published by the Gloucestershire Wildlife Trust:

...
Wikipedia