Threlkeldia diffusa, also known as Coast Bonefruit, is a perennial herb which occurs in coastal areas and saline flats in Australia. It is sometimes prostrate or may grow up to 0.4 metres in height. The green flowers occur between October and November (spring) in its native range.
It is closely related to Datura, belonging to the same nightshade family, solanaceae. Brugmansia blooms dangle like great trumpets or bells while Datura blooms stand erect.