Eriodictyon altissimum is a rare species of flowering plant in the borage family known by the common name Indian Knob mountainbalm.

It is endemic to San Luis Obispo County, California, where it is known from only about six occurrences in the Irish Hills on the coast and nearby Indian Knob.

The very narrow, linear leaves are up to 9 centimeters long, white-hairy on the undersides and hairless and sticky on top.

[1] There are occurrences on protected land within Montaña de Oro State Park and the Morro Dunes Ecological Reserve.

[2] For this reason, the United States Fish and Wildlife Service has recommended that the species be downlisted to threatened status.