Wahlenbergia tumidifructa is a small herbaceous plant in the family Campanulaceae. This species is native to Australia, where it has a wide distribution across subtropical, semi-arid and arid zones, occurring in all mainland states and territories.
The slender, erect, annual herb typically grows to a height of . It blooms between March and December producing blue-white flowers.
The species is found on clay pans and along drainage lines across the interior of Australia, including in the Mid West, Goldfields-Esperance, Wheatbelt and Pilbara regions of Western Australia where it grows in sandy-loamy soils.