The complete sequence of floral development in three species of Acacia was analysed. These species were sampled from each of the three Acacia subgenera. The species were Acacia berlandieri Benth. (subg. Aculeiferum), A. pennatula (Schltdl. & Cham.) Benth. (subg. Acacia) and A. saligna (Labill.) H.L.Wendl. (subg. Phyllodineae). The aim of the study was to determine whether the different subgenera share developmental pathways during flower formation. This study showed that development in the genus Acacia is heterogeneous. Each species studied showed different inception patterns of the calyx and androecium, whereas the inception patterns of the corolla and gynoecium were similar. These differences of inception in the calyx are not necessarily constant within each subgenus. Nevertheless, each subgenus was differentiated on the basis of inception patterns of the androecium, and other features such as the presence or absence of congenital or postgenital fusion in the calyx and corolla, and the time of differentiation of calyx and corolla tubes and the style.
Abstract— A new species of the genus Coulteria from the seasonally dry forest of the Rio Balsas Depression, Mexico is described and illustrated. Coulteria sousae is morphologically most similar to Coulteria pringlei but differs from it by
having smaller flowers (1 cm long), long stipitate fruit, leaflets that are glabrous and coriaceous at maturity, and an allopatric distribution. The conservation status of this species is suggested to be Endangered (EN), according to the IUCN Red List Categories and Criteria.
Native neotropical species of Acacia, totalling 230 species, are represented by two subgenera, Acacia and Aculeiferum. The number of taxa per country and their distribution are presented. For subgenus Aculeiferum, the species of section Filicinae are the richest in Mexico, while species of section Monacanthea are the most diverse in Brazil, Bolivia and Mexico. The species of subgenus Acacia have three main areas of diversity, with Mesoamerica being the most important region for the myrmecophyllous species and Mexico, the United States and Cuba for the non-myrmecophyllous species.
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