Leptosiphon chrysanthus[1]) is a species of flowering plant in the phlox family known by the common name golden linanthus.

[2] Golden linanthus is an annual herb producing a thin, threadlike stem with occasional leaves divided into narrow needlelike lobes.

The oppositely arranged leaves are each divided into very narrow bristlelike lobes up to a centimeter long.

[3] The tip of the stem has an inflorescence of usually a single flower with corolla lobes under a centimeter long.

The nominate subspecies generally has bright to golden yellow flowers, while ssp.