Plants of this subspecies of forget-me-not are perennial rosettes which form caespitose tufts or clumps, with ebracteate, erect inflorescences, and white corollas with exserted stamens.

[3][4][5][2] The holotype specimen of Myosotis brockiei was collected from Gorge of the Cobb River, Western Nelson, South Island, New Zealand by W.B.

[7][4] The specific epithet, brockiei, honors the collector of the type specimen, Walter Boa Brockie (1897–1972) who was a New Zealand botanist and horticulturist.

dysis by three minor characters, i.e. its habit (single rosettes or tufts instead of stoloniferous mats), acute apices of the lower cauline leaves, and presence of retrorse hairs on the scape below the flowering portion of the inflorescence.

The upper surface of the leaf are densely covered in mostly flexuous, some curved, patent to erect, antrorse (forward-facing) hairs that are oriented oblique to the mid vein.

Each rosette has 1–6 erect, usually once-branched (sometimes unbranched), ebracteate inflorescences that are up to 385 mm long and are bifurcating in an open, forked 'V' shape near the tips.

brockiei is a forget-me-not subspecies endemic to subalpine Western Nelson, South Island, New Zealand usually from 790–1220 m ASL.

It is found on rocks, rubble, bluffs, cliffs, outcrops, or steep river banks, on limestone or other lime-rich substrates, or on ultramafics.

[12] The species is listed as At Risk - Naturally Uncommon on the most recent assessment (2017-2018; as M. brockiei) under the New Zealand Threatened Classification system for plants, with the qualifier "RR" (Range Restricted).