Micrandropsis  

Tree, monoecious. Exudate present, white. Unarmed*. Indumentum present, stellate. Stipules free*, simple, unlobed, entire *, not spine-like*, not leaf-like*, without glands. Leaves distributed evenly along stem, alternate, simple, unlobed, base symmetrical, margin entire, blade not pellucid-punctate, 1–2-glandular at base; venation pinnate; domatia absent*; stipel-like structures absent*. Petiole present, swollen or bent at one or both ends, without glands. Inflorescence with axis, terminal or axillary, often laxly cymose–paniculate; flowers small, unisexual, rarely bisexual*; bracts not leaf-like*, green; pedicels present, not articulated*. Male flowers: sepals 5; imbricate, free, greenish; petals 0; disc outside the staminal whorl* (extrastaminal), annular*, 5-lobed; stamens 5 (–7), free; anther linear, without conspicuous modification, thecae latrorse in bud*; pistillode present. Female flowers: sepals 5; imbricate, free, greenish; petals 0; disc surrounding the ovary, annular; ovary locules 3, ovules per locule 1; styles 3*, free or partially fused, style 2-branched, (i.e. ultimate divisions per locule 2), styles or stigmas not flat*, surface smooth*; staminodes absent. Fruit dehiscent, smooth*, wrinkled when dried, greenish to brown; seed carunculate, with no other covering or membranous layer; embryo flat, not minute, cotyledons leaf-like.

An asterisk * indicates a state has been assumed but not yet confirmed.

World Checklist: 1 species: Micrandropsis scleroxylon

See: Rodrigues, W. A. (1973) Micrandropsis, novo gênero de Euphorbiaceae da Amazônia. Acta Amazonica 3(2): 5–6; Murillo-Aldana, J. & Franco-Rosselli, P. (1995) Las Euforbiaceas de la region de Araracuara. Santafe de Bogota: Tropenbos, Colombia.