Smilax californica

Smilax californica, the California greenbriar, is a common woody vine native to northern California and southwestern Oregon in the western United States.

The leaves are dull green, petioled, alternate, and circular to heart-shaped. They are generally 5–10 cm long. The stems are round, green and have sharp spines.

The plant is native to coniferous streambanks below 5000 feet.