Hesperolinon micranthum is a species of flowering plant in the flax family known by the common name smallflower dwarf flax.

It is native to the west coast of North America from Oregon to Baja California.

It grows in a number of open habitats, often on serpentine soils.

This is a spindly annual herb producing a very thin stem 5 to 20 centimeters in height.

Its small, sparse leaves are linear in shape.