Croton sertanejus, a new species from Seasonally Dry Tropical Forest in Brazil, and redescription of C. echioides (Euphorbiaceae)

During a taxonomic study of the species Croton sect. Adenophylli occurring in Brazil, approximately 140 collections usually identified as echioides, C. rhamnifolius or rhamnifolioides caught our attention due to distinct morphology vegetative and reproductive organs. After analysis these collections, we concluded that they represent new species, sertanejus Sodré & M.J.Silva sp. nov., which was also corroborated by an anatomical their leaves. This can be differentiated pseudomonopodial branching, leaves with petioles up 1.7 cm long, 4–6 subsessile nectary glands indumentum sessile trichomes on both surfaces. Detailed descriptions, including details leaf anatomy, are provided for nov. its closely related species. We formalize synonymization kalkmannii under echioides re-evaluate typification names, order better clarify status.