Lasthenia microglossa is a species of flowering plant in the family Asteraceae known by the common name smallray goldfields.

It is endemic to California, where it grows in shady areas in a number of habitats.

Lasthenia microglossa is a small annual herb growing sprawling stems along the ground or erect to a maximum height near 25 centimeters.

The hairy leaves are generally linear in shape and are up to 8 centimeters long, paired oppositely on the stem.

The fruit is a hairy achene a few millimeters long, sometimes with a pappus of tiny scales.