St. Johnswort, also known as Klamath weed, is a member of the St. Johnswort family. It is an introduced, creeping perennial which reproduces by seeds and short horizontal roots.
Leaves are opposite, elliptic to oblong, with translucent dots long the leaf margins.
The bright yellow flowers have five petals which have black dots along their margins, and occur on showy terminal clusters. St. Johnswort is an aggressive invader of overgrazed rangeland. It is found on gravelly or dry sandy soils. Any unauthorized duplication is strictly prohibited by existing copyright laws.