traillii is a subspecies of flowering plant in the family Boraginaceae, native to New Zealand.

Plants of this subspecies of forget-me-not are perennial with a prostrate habit, bracteate inflorescences, and white corollas.

[2][3] The latest taxonomic revision of recognizes an expanded M. antarctica which includes plants from mainland New Zealand, Campbell Island and Chile, including those previously called M. drucei (L.B.Moore) de Lange & Barkla and M. pygmaea Colenso (the latter is an illegitimate name).

antarctica by its curved, appressed to spreading hairs on the blade and edges of the rosette leaves.

antarctica has flexuous, spreading to erect hairs on the blade and edges of the rosette leaves.

antarctica are usually found at inland localities on mainland New Zealand, but can be coastal in Fiordland, Campbell Island and Chile.

traillii was collected by Thomas Kirk at Mason Bay, Stewart Island (Rakiura), is lodged at the herbarium of the Museum of New Zealand Te Papa Tongarewa (WELT SP002666).

The rosette leaf blades are 6–22 mm long by 3–15mm wide (length: width ratio usually 1.0–2.5: 1), oblanceolate obovate, widest at or above the middle, green or reddish-brown, with an obtuse apex.

The corolla is white or cream, up to 4 mm in diameter, with a cylindrical tube, and small yellow scales alternating with the petals.

traillii is found in mostly coastal habitats, including turfs, sand dunes, fellfields, terraces, and rocks.

traillii was previously listed as M. pygmaea in the most recent assessment (2017-2018) of the New Zealand Threatened Classification for plants as At Risk - Declining with qualifier "Sp" (Sparse).