Manihot allemii M. J. Silva is described and illustrated as a new species, and its morphological affinities and conservation status is discussed. It is most similar to M. salicifolia Pohl in having a subshrubby and erect habit and in the general aspect of its unlobed leaves, but differs from it in having leaves that are conspicuously petiolate, an inflorescence that is a congested spike-like thyrse, entire and diminute bracts and bracteoles subtending flowers of both sexes, pistillate calyx that is deeply lobed with oblong lobes, and staminate flowers with 8 or 10 stamens. Both species belong to a group of 14 species recognized by their possession of entire and unlobed leaves, which are the subject of taxonomic studies by the second author. Some notes on the leaf anatomy of species of Manihot that have entire and unlobed leaves are also presented.
During the preparation of the taxonomic treatment of Manihot in the Midwest Region of Brazil, a new species was found. Manihot
fallax M.J. Silva & L.S. Inocencio is described, illustrated and morphologically compared with similar simple-leaved species. The conservation status, geographic distribution (including map), ecology, phenology and notes about leaf anatomy of the new species are given. The synonymisation of M.
robusta M. Mend. & T. B. Cavalc. under M.
attenuata Müll. Arg. and lectotypes for M.
attenuata and M.
brachystachys Pax & K. Hoffm are also proposed. An emended description of M.
attenuata is proposed as the original description is incomplete as it lacks information on the pistillate flowers, fruits and seeds.
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