Euphorbia cyparissias. Eccentric.
This European plant Euphorbia has escaped from gardens to invade wasteland and hedgebanks, soon covering a large area of land. The stems and fern-like leaves contain a milky juice, which stains the skin and can produce blisters. The tiny yellow female flower develops red tinges as it matures. How did it escape? Maybe seed spread on the light wind which blew between picket railings on fences close to the countryside.
A famous fictitious detective, Hercule Poirot, lived in England in the early twentieth century, as eccentric as they come with his strange accent, neat moustache and prudish ways. Like the Euphorbia, he soon invaded society and worked his way into readers' hearts.
Proverb: Every man for himself, and the Devil take the hindmost.