Manihot appanii (Euphorbiaceae s. s.), a New Species from Brazil, and a Key to the Species with Unlobed or Very Shortly Lobed Leaves

A new species of Manihot from Brazil was discovered in the course of revising the taxonomy of species of the genus with unlobed or very shortly lobed leaves. Manihot appanii is herein described and illustrated. Its relationships with M. stricta and M. saxatilis, the morphologically most similar species, are discussed, as well as its geographical distribution and conservation status. A key to the species of Manihot with unlobed or shortly lobed leaves is also provided.