Myosotis explanata

Myosotis explanata is a species of flowering plant in the family Boraginaceae, endemic to high-elevation habitats in the South Island of New Zealand. Thomas Cheeseman described the species in 1906. Plants of this species of forget-me-not are perennial rosettes with ebracteate inflorescences and white corollas with stamens that are partly exserted, with the tips of the anthers only surpassing the scales.

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Myosotis explanata plants are rosettes. The rosette leaves have broad petioles that are about as long as the leaf blades. The rosette leaves are 30–70 mm long by c. 15 mm wide (length: width ratio c. 2–4: 1), and the leaf blade is obovate to linear-spathulate, widest at or above the middle, with an obtuse, rounded apex. Both surfaces of the leaf are uniformly and sparsely to densely covered in patent to erect hairs. The upper surface of the leaf has densely distributed antrorse (forward-facing) hairs whereas on the lower surface the hairs are not as densely distributed and retrorse (backward-facing). Each rosette has several ascending to erect, ebracteate inflorescences that are up to 200 mm long and mostly unbranched. The cauline leaves are similar to the rosette leaves, but are smaller sessile, become smaller toward the top of the inflorescence, narrow-elliptic, and acuminate, and have hairs similar to the rosette leaves. The flowers are many per inflorescence, and each is borne on a short pedicel, without a bract. The calyx is c. 10 mm long at flowering and fruiting, lobed to one-half of its length, and with some patent to erect hairs, some of which are hooked, as well as retrorse hairs near the base. The corolla is white and can reach 10 mm in diameter, with a cylindrical tube, and small scales alternating with the petals. The anthers are partly exserted, with the anther tips only surpassing the faucal scales. The nutlets are c. 2.5 mm long. The pollen of Myosotis explanata is unknown. The chromosome number of M. explanata is unknown. Flowering November–January and fruiting January–April.