M. maypurensis (Kunth) G. Don & Hort. Brit.

Annual or biennial, glabrous; stems erect, up to 60 cm, branched; rosulate leaves oblong, usually withered, lower leaves oblong or spatulate, cuneate, petiolate (petioles up to 2.5 cm), 3.0–8.0 cm long and (0.2–0.4)0.5–2.0 cm wide (sometimes narrower), acuminate; inflorescences a spike, not one-sided, often spreading; flowers solitary (rarely two per node), with a bract and two bracteoles, pedicellate (pedicels 1.5–3.0 mm), perianth segments 5, oblong to ovoid, white or yellowish; stamens 5–8, stigmas 3–5, filiform; fruit slightly protruding from the perianth or up to twice its length, fruit body 1.0–1.1 mm across, with outgrowths 0.2–0.5 mm long terminating in a group of 2–4 hooked hairs (Fig. 8A, B); pericarp readily scraped off the seed; seed ~1mm, with rough surface (Fig. 8D).

Tropical South America (Fig. 23).