Sonchus lobatiflorus, synonym Dendroseris gigantea, is a species of flowering plant in the family Asteraceae.

[1] Sonchus lobatiflorus has one plant representative left on Selkirk island, although it is being artificially planted on Robinson Crusoe Island.

[citation needed] The species was first described in 1896 by Federico Johow as Dendroseris gigantea.

The genus Dendroseris was considered endemic to the Juan Fernández Islands.

In 2012, based on molecular phylogenetic evidence, it was shown that Dendroseris was embedded within the genus Sonchus, and all its species were transferred to that genus.