Lomatium howellii is an uncommon species of flowering plant in the carrot family known by the common name Howell's biscuitroot, or Howell's lomatium. It is native to the Klamath Mountains of southern Oregon and northern California, where it is a member of the local serpentine soils flora. It is a perennial herb growing up to 80 centimeters tall from a thick, branching taproot. It often lacks a stem, producing upright flower clusters and leaves from ground level. The long leaves may exceed a meter long and are each made up of many oval or rounded toothed leaflets. The flower cluster is an umbel of small yellow or purplish flowers.