13; see text Mariosousa is a genus of 13 species of flowering plants in the family Fabaceae.

It belongs to the mimosoid clade of the subfamily Caesalpinioideae.

[1] Restricted in range to Central America, Mexico, and the southwestern United States, members of the genus are trees or shrubs bearing alternate, bipinnately compound leaves—each with a swelling at the base of the petiole—and white- to cream- or yellow-colored flowers.

The flowers are typically borne in elongated, bottle brush–like spikes.

The fruits that later replace these flowers are markedly flattened pods.