Myosotis petiolata is a species of flowering plant in the family Boraginaceae, endemic to the Hawkes Bay region of the North Island of New Zealand.

Plants of this species of forget-me-not are perennial rosettes with ebracteate inflorescences and white corollas with exserted stamens.

[4][5] The lectotype specimen of Myosotis petiolata was collected by William Colenso, and the isolectotype is lodged at the herbarium of the Museum of New Zealand, Te Papa Tongarewa (WELT SP023506).

[5][9] Three individuals from one population of M. petiolata were also genotyped in a study that developed microsatellite DNA markers for another species group of New Zealand Myosotis.

Both surfaces of the leaf are uniformly and densely covered in straight, appressed, antrorse (forward-facing) hairs.

[5] Myosotis petiolata is currently only known to occur in the Te Waka Range, North Island, New Zealand in the Hawkes Bay region, at c. 900 m ASL, on limestone cliffs and bluffs.

[1] Myosotis petiolata was featured on RNZ Critter of the Week as "one of the most endangered plants in the country".