White flowers are strongly zygomorphic (bilaterally symmetrical), rarely solitary, in axillary fascicles, with caducous corolla with the bottom petal longer than the others and clawed with a well exserted spur.

The stamens have free filaments, with the two lowest being calcarate (spurred).They also possess a large dorsal connective appendage that is entire and oblong-ovate.

[4] In 1846, Lindley classified both Schweiggeria and Ionidium in Violaceae, within the Violales,[5] although Bentham and Hooker (1862) called the family Violarieae.

[6] Historically Schweiggeria was placed within Violaceae in the subfamily Violoideae, tribe Violeae, subtribe Violinae, together with Anchietea, Calyptrion, Noisettia and Viola.

[3] Four species have been described; of which two, S. fruticosa and S. mexicana are accepted by Plants of the World Online, considering S. floribunda and S. pauciflora as synonyms of S.