Lycium cooperi is a species of flowering plant in the nightshade family known by the common name peach thorn.

It is native to the southwestern United States,[1] where it grows in a variety of desert and mountain habitat types.

This is a bushy, erect shrub approaching a maximum height of 4 metres (13 ft) with many rigid, thorny branches.

The branches are lined thickly with fleshy oval or widely lance-shaped leaves each 1–3 centimetres (0.39–1.18 in) long and coated with glandular hairs.

The inflorescence is a small cluster of tubular flowers roughly 1–2 centimetres (0.39–0.79 in) long including the calyx of fleshy sepals at the base.