acaulis Gentiana acaulis, the stemless gentian,[5] or trumpet gentian,[6] is a species of flowering plant in the family Gentianaceae, native to central and southern Europe, from Spain east to the Balkans,[7] growing especially in mountainous regions, such as the Alps and Pyrenees,[8] at heights of 800–3,000 m (2,625–9,843 ft).

[9] The leaves, which can be lanceolate, elliptical or obovate,[7] are evergreen, 2–3.5 cm long, in a basal rosette, forming clumps.

This plant, like others of its genus, is valued in cultivation for the unusually pure intense blue of its blooms.

[11] The closely related Gentiana clusii, often called by the same common name as this species, differs in its preference for limy (alkaline) soils.

Phylogenetic research suggests G. acaulis is sister to a clade containing 4 other Gentiana species: G. verna, G. bavarica, G. nivalis, and G.