Sonchus oleraceus Linnaeus var. laevis Linnaeus, Species Plantarum 2: 794. 1753.

RCN: 5808.

Lectotype (Boulos in Jarvis & Turland in Taxon 47: 368. 1998): Herb. Burser VI: 16 (UPS) .

Current name: Sonchus oleraceus L. ( Asteraceae).