‘Pimpernelle’ is a lovely sounding word. I first heard it not through botany but the story of the Scarlet Pimpernel by the splendidly named Baroness Emuska Orczy.
Botanically it refers to a handful of unrelated plants, some edible, like 𝑆𝑎𝑛𝑔𝑢𝑖𝑠𝑜𝑟𝑏𝑎 𝑚𝑖𝑛𝑜𝑟, salad burnet or pimpernelle in French.
There is the Scarlet Pimpernel, 𝐴𝑛𝑎𝑔𝑎𝑙𝑙𝑖𝑠 𝑎𝑟𝑣𝑒𝑛𝑠𝑖𝑠, which is mildly toxic. There is the genus 𝑃𝑖𝑚𝑝𝑖𝑛𝑒𝑙𝑙𝑎, which includes anise.
It was, however, the Yellow Pimpernel, 𝐿𝑦𝑠𝑖𝑚𝑎𝑐ℎ𝑖𝑎 𝑛𝑒𝑚𝑜𝑟𝑢𝑚 I came across in the Forest last Saturday, walking with a group towards Notre-Dame de Bonne Odeur.
Common names can sound lovely, be illuminating, hold stories within their branches, leaves and flowers. But for accuracy we use Latin.