Malacothamnus astrotentaculatus is a species of flowering plant in the mallow family known by the common name starry-tentacled bushmallow.

It is named after the somewhat tentacle-like outgrowths on the calyx that are covered in stellate trichomes.

It is endemic to Shasta and Tehama counties in California.

[1][2] Malacothamnus astrotentaculatus is distinguished from the rest of the genus by the combination of linear calyx bracts, calyx lobes generally much wider above the base than at the base, and a spike-like inflorescence.

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