''Thamnoseris'' is a genus of plants in the dandelion tribe within the

daisy family The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae w ...

. There is only one known species, '' Thamnoseris lacerata'', commonly known as the

pachycaul Pachycauls are plants with a disproportionately thick Trunk (botany), trunk for their height, and few branches. This can be the product of exceptional primary growth (as with Arecaceae, palms and cycads) or disproportioate secondary growth as with ...

tree. It is endemic to the Desventuradas Islands in the

South Pacific The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the continen ...

, part of the Republic of Chile.

References

Endemic flora of Chile Asteraceae genera Cichorieae Desventuradas Islands {{Cichorieae-stub