Mariosousa millefolia, commonly known as Milfoil Wattle, is a deciduous shrub or small tree native to arid and semi-arid regions, including desert grasslands and scrublands in the Southwestern United States and Mexico. It typically grows to a height of 3-9 feet (0.9-2.7 meters) and a width of 2-4 feet (0.6-1.2 meters), with a rounded form that can be multi-stemmed. The foliage is finely divided, giving it a feathery appearance. Milfoil Wattle blooms in the summer, producing clusters of small, ball-shaped flowers that are white, cream, and yellow, which are moderately showy and attract pollinators.

Milfoil Wattle is valued for its drought tolerance and ability to thrive in challenging environments, making it suitable for xeriscaping and naturalistic plantings in arid regions. It is also used for erosion control due to its root system. In cultivation, it prefers full sun or part shade and requires medium amounts of water, adapting well to soils with medium drainage. While it is not commonly found in ornamental horticulture, its resilience and unique texture make it an interesting choice for specialized landscapes.CC BY-SA 4.0