Lachnostachys (common name Lambs tails)[5] is a genus of flowering plants in the mint family, Lamiaceae, first described in 1842 by William Jackson Hooker.

The entire genus is endemic to Western Australia[4] A 2009 study of Chloantheae[3] indicates that Lachnostachys is closely related to the genera, Newcastelia and Physopsis, with none of the three being monophyletic.

Plants in this genus are shrubs or subshrub growing from 0.3 to 1.5 m high.

The leaf blades are entire, or recurved along the margins, or sometimes flat.

They are woolly both abaxially and adaxially, although mature leaf blades are sometimes rugose (wrinkled) and glabrescent (becoming hairless).