Leptosiphon lemmonii (syn. Linanthus lemmonii) is a species of flowering plant in the phlox family known by the common name Lemmon's linanthus.

Leptosiphon lemmonii is native to the San Bernardino Mountains and the Peninsular Ranges in southern California (U.S.) and northern Baja California (México). It grows below 1,900 metres (6,200 ft), in dry inland chaparral, oak woodlands, the Colorado Desert chaparral ecotone, and Yellow pine forest habitats.

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