Mesosphaerum caatingense (Lamiaceae), a new species from the semi-arid Caatinga Region of Northeast Brazil

Abstract

• A new species, Mesosphaerum caatingense Harley & J.F.B.Pastore (Lamiaceae: tribe Ocimeae: subtribe Hyptidinae), is described from the semi-arid Northeast region of Brazil known as the Caatinga biome, included under the domain of the STDF (Seasonally Tropical Dry Forest). The generic placement and its conservation status are assessed and its phenology is discussed. The new species is compared with some of its morphologically allied species, M. pectinatum, M. irwinii and M. sidifolium. Illustrations, photographs, a distribution map and a key to Brazilian species are also provided. © 2019, The Board of Trustees of the Royal Botanic Gardens, Kew.