Sébastien Vaillant

Pilosella officinarum (synonym Hieracium pilosella), known as mouse-ear hawkweed, is a yellow-flowered species of flowering plant in the daisy family Compositae (= Asteraceae), native to Europe and northern Asia. It produces single, lemon-coloured inflorescences. Like most hawkweed species, it is highly variable and is a member of a species complex of several dozens of subspecies and hundreds of varieties and forms. It is an allelopathic plant.

Rhaponticum is a genus of flowering plants in the tribe Cardueae within the family Asteraceae. As of November 2023, it is accepted by Plants of the World Online, but rejected by the Global Compositae Database in favour of Leuzea.

Rhaponticoides is a genus of flowering plants in the family Asteraceae, found in northern Africa, southern and eastern Europe, and western Asia as far east as Mongolia. They were resurrected from Centaurea. In the 20th century the genus Centaurea was paraphyletic, because it was based on a type species, C. centaurium, which was less related to the vast majority of other Centaurea than to species which were classified as belonging to other genera. In 2001 Werner Greuter solved this by moving the C. centaurium and the related species in the former subgenus Centaurea to an old, resurrected

Boerhavia is a genus of over 100 species in the Nyctaginaceae family. The genus was named for Herman Boerhaave, a Dutch botanist, and the genus name is frequently misspelled "Boerhaavia". Common names include spiderlings and hogweeds.

Pterocephalus is a genus of flowering plants in the family Caprifoliaceae. It comprises 34 species of herbs and shrubs ranging from the Mediterranean to central Asia, the Himalayas, and tropical Africa. From Greek πτερον, pteron, a wing, and κεφαλη, kephale, a head, in reference to the receptacle of the flowers being villous or chaffy.