Leptosiphon ciliatus (syn. Linanthus ciliatus) is a species of flowering plant in the phlox family known by the common name whiskerbrush.

It is a common plant in many types of habitats, including chaparral, oak woodland, grassland, yellow pine forest, red fir forest, lodgepole forest, and subalpine forest.

Leptosiphon ciliatus is a hairy annual herb producing a thin stem up to about 30 centimeters tall. The leaves are each divided into needle-like lobes up to 2 centimeters long, with leaf pairs appearing as a cluster of narrow lobes.

The tip of the stem has an inflorescence of one or more flowers each with a long, hairy tube up to 2.5 centimeters long emerging from the leaf-like sepals. The face of the flower is less than a centimeter wide and pale to bright pink with white and yellow coloring and reddish spots on the throat. The bloom period is March to July, depending on altitude and latitude.

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