Abstract
Manihot caerulescens subsp. laevis, M. carthaginensis subsp. hahnii, and M. dichotoma var. undulata, all three assigned herein to section Glaziovianae, are described and illustrated. Manihot carthaginensis subsp. hahnii appears endemic to northern and northwestern portions of Minas Gerais. Manihot dichotoma var. undulata and M. caerulescens subsp. laevis are endemic to Brazil's northeastern semiarid phytogeographic region known as caatinga. A new combination is provided for M. glaziovii, which is submerged as a subspecies in the expanded circumscription of M. carthaginensis.
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