M. papillosa M. S. Marchioretto, J. C. de Siqueira, Pesquisas & Botânica

Perennial with a taproot or rarely annual (?) herb with caudex; stems erect, densely covered with short papillae; leaves papillate, oblong or lanceolate, appressed or somewhat spreading, cuneate, 2.0–4.0 cm long and 0.2–0.7 cm wide; inflorescence a spike; flowers subsessile, with the pedicels 0.25–0.5 mm long, with a bract and two bracteoles; perianth segments 5, oblong, greenish; stamens 6–8; stigmas 2, thick; fruit 1.1–1.25 × 0.9–1.1 mm, with short finger-shaped outgrowths (Fig. 5A, B); seed 0.9–1.0 mm, with rough surface (Fig. 5D). Morphologically, this species is most similar to M.celosioides and is distinguished by the papillate stems and leaves.

(Fig. 16) Endemic to Minas Gerais (Diamantina Mun.), Brazil.