Lithospermum incisum is a species of flowering plant in the borage family known by several common names, including narrowleaf stoneseed, fringed gromwell, narrowleaf puccoon, and plains stoneseed. It is native to much of central Canada and the United States, where it is known from many types of habitat. It is a hairy perennial herb growing from a taproot and woody caudex. It produces a cluster of stems up to about 30 centimeters long. The stems are lined with narrow, pointed leaves up to 6 centimeters long. The slender, trumpet-shaped flowers are pale to bright yellow or gold, and may approach 4 centimeters long. The corolla face is 1 to 2 centimeters wide, its lobes sometimes ruffled.