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  1. We describe Pterolepis xaxa (Melastomateae, Melastomataceae), a new species collected in “caatinga rupestre” at Licínio de Almeida, Bahia, Brazil. Pterolepis xaxa resembles the recently described Pterolepis haplostemona, both representing the only two species in the genus that are haplostemonous (i.e., with the stamens equal in number to the petals). Apart from flowers with a single whorl of stamens, P. xaxa can also be recognized by intercalycine projections consisting of a very short central axis topped with 2–3 trichomes, and white petals (vs. intercalycine projections lacking trichomes at the apex and magenta or lilac petals in P. haplostemona). 
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    Free, publicly-accessible full text available June 9, 2024
  2. Recientes colecciones de Melastomataceae en la Sierra de Neiba, en la República Dominicana han iluminado otra nueva especie del clado Caribeño de Miconia, descrita aquí como M. pegueroana. Por los domacios prominentes, flores 4-meras y escasa pubescencia, esta nueva especie parece pertenecer al subclado Calycodomatia (Miconia sect. Calycodomatia). Se compara esta nueva especie morfológicamente con su pariente putativo M. turbinata, de la cual comparte varios caracteres, y se provee placas fotográficas y una ilustración de la nueva especie. La relación posible entre M. turbinata y M. pegueroana sugiere una especiación alopátrica por dispersión por largas distancias entre cordilleras separadas, la Sierra de Bahoruco/Massif de la Selle de la isla sur y la Sierra de Neiba de la isla norte. 
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  3. Miconia tetrandra, a morphologically distinctive species restricted to the Caribbean region, is provided with an updated assessment of its phylogenetic position and taxonomy. A detailed description and nomenclatural treatment are provided, along with a consideration of phenology, distribution and habitat, and citation of specimens examined. The species is a member of the Caribbean clade, and it is unusual within Miconia in having flowers with only four stamens (alternating with the petals), with short, obovate, yellow anthers that each open by two large pores. Miconia tetrandra is morphologically quite divergent from, but is likely related to, a clade comprised by M. angustifolia, M. urbanii, and M. biflora, and these three species traditionally have been included within the genus Tetrazygia. In contrast, M. tetrandra usually has been placed within Miconia. 
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