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Three South-American new species belonging to Cinnamomum, Mezilaurus, and Williamodendron, are described and illustrated from specimens collected in the Atlantic rainforest of Brazil. The new species are Cinnamomum baitelloanum, Mezilaurus sessiliflora, and Williamodendron itamarajuensis. Their putative relationships within the respective genus are discussed.

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In the first treatment of this series, twenty‐one species of 12 genera of Lauraceae (excluding Ocotea) were reported for the Reserva Natural Vale. In the present treatment, thirty‐two species of Ocotea are reported from the area. Descriptions, an identification key, commentary and illustrations of the species are presented. Pistillate flowers of Ocotea aniboides and O. kostermansiana are described for the first time, and lectotypes are designated for six names: Aydendron nitidum, Ocotea glaziovii, O. kostermansiana, Oreodaphne maranhana, Oreodaphne pallida, and Oreodaphne spectabilis.

Fifty‐five species belonging to 14 genera of Lauraceae are recorded in the Reserva Natural Vale. In the present treatment, twenty‐one species are reported: Aiouea (3), Aniba (2), Beilschmiedia (1), Cassytha (1), Cryptocarya (3), Endlicheria (1), Licaria (2), Mezilaurus (1), Nectandra (4), Persea (1), Rhodostemonodaphne (1), and Urbanodendron (1). Descriptions, identification keys, comments and illustrations of the species are presented. The species of Ocotea will be treated in part II of this series.