Scorzoneroides, commonly known as hawkbits, is a genus of flowering plants in the tribe Cichorieae within the family Asteraceae (order Asterales). The genus comprises approximately 29 species of perennial herbs distributed mainly across Europe and temperate Eurasia.
The genus was formerly subsumed within the broader concept of Leontodon (hawkbits and hawkweeds), but molecular phylogenetic studies demonstrated that Leontodon in its traditional, wider circumscription represented an unnatural grouping of two distinct evolutionary lineages. As a result, the former subgenus Oporinia of Leontodon was resurrected as the separate genus Scorzoneroides.
Plants in this genus are characterized by ligulate (strap-shaped) yellow florets — a hallmark of the tribe Cichorieae — and typically bear all-basal leaves. The most widely known species, Scorzoneroides autumnalis (autumn hawkbit or fall dandelion), is a perennial herb growing to about 35 cm, with branched stems carrying several bright yellow flower-heads roughly 30 mm across. It is native from Europe east to western Siberia and has been introduced in North America, where it grows in damp grassland and meadows.
Chemically, several members of the genus produce a diverse array of sesquiterpene lactones — including germacranolides and guaianolides of the hieracin and lactucin types — as well as phenolic compounds such as luteolin-type flavonoids, chlorogenic acid, and the caffeoyl tartaric acid derivative cichoric acid.
Distribution
Species of Scorzoneroides are native primarily to Europe and temperate Eurasia, extending east to western Siberia. Scorzoneroides autumnalis, the most widespread member, is also introduced and naturalized in North America. The genus is particularly well represented in Ireland and Great Britain, where it occurs abundantly in damp grasslands and meadows.
Ecology
Scorzoneroides autumnalis grows frequently in damp grasslands and meadows. It flowers from June to October, considerably later in the season than common dandelions, and produces wind-dispersed achenes. The fly Tephritis leontodontis is recorded as attacking the capitula (flower-heads) of this species.
Taxonomy Notes
Scorzoneroides was long included within a broadly defined Leontodon. Molecular studies revealed that Leontodon sensu lato is polyphyletic, comprising two separate lineages. The former subgenus Oporinia of Leontodon was therefore resurrected as Scorzoneroides, restoring a genus-level distinction that reflects true evolutionary relationships.
