Phyllanthopsis arida, the trans-Pecos maidenbush,[2] is a rare plant species endemic to western Texas.

[3] Phyllanthopsis arida is a thornless, dioecious, deciduous, highly branching shrub up to 100 cm tall.

Leaves are ovate to obovate, up to 1.0 cm long.

Flower solitary or in small clusters, yellow-green, up to 3 mm in diameter.

Capsule is hanging, up to 7 mm long.