The flowers of Harveya pumila grow in dense clusters. There are small, linear, erect bracts at the base of the nearly stalkless flowers. The calyx is about 2,5 cm long.
The flower has a funnel-shaped corolla, about 4 cm long. It opens into five spreading lobes that are slightly two-lipped, i.e. deviating from being radially symmetrical. The lobe margin curves gracefully in an elaborately rounded to obovate shape with a flat, serrated tip. Two parallel yellow markings can be seen here in the throat of the flower on the lower corolla lobe. Fine silvery hairs are visible on the corolla lobes.
The stamens are shorter than the white, down-curved style with its kidney-shaped stigma, prominently displayed in the flower mouth (JSTOR).