The mostly upright, narrowly ovate seated leaves of 8–36 mm (0.31–1.42 in) long, have rounded teeth along the margins that are mostly rolled downwards, and are set in opposite pairs.

The yellow to yellowish brown petals are merged into a stongly mirror-symmetric corolla, with a long, in the upper part distinctly curved tube, topped by a helmet-shaped upper lip that encloses the anthers and a spreading, three-lobed lower lip that has two bulges in front of the throat of the tube.

The filaments of the 4 stamens have largely merged with the upper lip of the corolla and are topped by shaggy anthers that each have 2 district spines at their lower end.

[3] Hedbergia decurva occurs in the high mountains of Ethiopia, eastern Uganda, Kenya and Tanzania, above approximately 2,500 m (1.6 mi) where it grows in ericaceous and alpine vegetations.

These three taxa share evolutionary affinities with genera Tozzia, Bellardia, Neobartsia, Parentucellia, and Odontites.