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Campomanesia (Myrtaceae) comprises approximately 45 species restricted to South America, 35 of which are found in Brazil. In this study, we ontogenetically analyzed species in the genus with the objectives of understanding and comparing the ovary and pericarp parts, highlighting characters that distinguish the species and providing information that could help to elucidate phylogenetic relationships in the future. We examined flower buds, flowers and fruits from herbarium specimens of 12 species. Results corroborate features that can be used as synapomorphies for the genus, such as the high number of locules, the development of one ovule per locule or the total sterilization of locules, and glandular locule wall. Campomanesia aurea, C. cavalcantina and C. xanthocarpa fruits have one or two layers of secretory cavities around the locules, whereas the remaining species have one layer. Sclereids were found in the ovarian mesophyll of C. guazumifolia, C. rufa and C. sessiliflora, while in the other species these only became evident when the pericarp was fully formed. The presence of trichomes and crystals was not consistent across species. Some anatomical characteristics, such as the disposition of secretory cavities in the outer and inner regions of the mesophyll and mesocarp, the presence or absence of sclereids, and the presence of trichomes and crystals at determined development phases, are promising to distinguish species in the genus. These features were compared with species in other closely related genera of Myrtaceae. |
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