Taxonomic differentiation among Portulaca minensis (Portulacaceae) and its allies occurring within the Espinhaço Range, Brazil, based on macro and microcharacters

Santos, Thaíla Vieira Alves dos; Leite, Kelly Regina Batista; Dórea, Marcos da Costa; Ocampo, Gilberto; Melo-de-Pinna, Gladys Flávia de Albuquerque; Oliveira, Reyjane Patrícia de

doi:10.1007/s00606-021-01758-z

Cited by 3 publications

References 40 publications

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Inflorescence patterns within the genus Portulaca (Portulacaceae): analyses of anatomy and morphology, based on species occurring in Brazil

dos Santos,

Leite,

Trindade

et al. 2023

Plant Syst Evol

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The in orescences of Portulacaceae have traditionally been considered capitula and their morphology and architecture have not been studied in detail. The purpose of this study was to expand the knowledge on the in orescences within this family, comparing members of distinct lineages of Portulaca occurring in Brazil, to understand some systematic and evolutionary patterns within this group. Morphological characteristics of the in orescences were analyzed using a light stereomicroscope, and for anatomical studies, we made transversal and longitudinal sections along the entire in orescence, including involucral bracts, analyzing them using an optical microscope. We con rmed that observed in orescences are determinate, composed of a rst-order dichasium, with second-order helicoidal branches forming a cephalioid structure. The involucral leaves differed from adjacent bracts, which did not display a constriction at the base, as commonly observed in leaves. Thus, we conclude that the congested in orescence of Portulaca is not a capitulum, but a cephalioid with different degrees of branch reduction within the genus. The Pilosa clade displayed the most congested cephalioid compared to members of the other analyzed clades. We showed present to show a new interpretation of the congested in orescences in Portulacaand reinforce the need to analyze solitary in orescences to understand the importance of these data to systematics, evolution, and pollinator-plant interactions within Portulacaceae. SpeciesVoucher Phylogenetic relationship**

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Inflorescence patterns within the genus Portulaca (Portulacaceae): analyses of anatomy and morphology, based on species occurring in Brazil

dos Santos,

Leite,

Trindade

et al. 2023

Plant Syst Evol

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Communities structure and plant diversity in endangered canga (ironstone) vegetation: a reference ecosystem in the Brazilian semiarid region

Carmo,

Campos,

Carmo

et al. 2024

Biota Neotrop.

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Compared with other hyperdiverse rocky ecosystems of eastern Brazil, canga vegetation, also known as campo rupestre ferruginoso, represents one of the least studied ecosystems but support a high proportion of rare and endemic plants. Large-scale iron mining is the primary cause of the loss and degradation of cangas. Therefore, there is a need to acquire knowledge about campo rupestre ferruginoso, both to support conservation planning and to provide information that can be used in ecological restoration models. In this study, we investigated the structure, diversity, and floristic composition of campo rupestre ferruginoso communities in four canga outcrops in a semiarid region and compared the values with those from existing studies on campo rupestre in eastern Brazil. A total of 5,724 individuals were sampled, and these individuals were distributed among 74 taxa, 54 genera, and 29 botanical families. We found that the plant communities in the cangas of the Vale do Rio Peixe Bravo are characterized by a unique set of functional groups, including a high proportion of succulents and poikilohydric plants, constituting an assemblage of specialized species. Considering the high degree of threat due to large-scale mining projects, our study revealed that the four cangas are in an excellent state of conservation, and we propose that they be considered reference ecosystems for future restoration projects.

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Inflorescence patterns within the genus Portulaca (Portulacaceae): analyses of anatomy and morphology, based on species occurring in Brazil

Santos

Leite

Trindade

et al. 2023

Preprint

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The inflorescences of Portulacaceae have traditionally been considered capitula and their morphology and architecture have not been studied in detail. The purpose of this study was to expand the knowledge on the inflorescences within this family, comparing members of distinct lineages of Portulaca occurring in Brazil, to understand some systematic and evolutionary patterns within this group. Morphological characteristics of the inflorescences were analyzed using a light stereomicroscope, and for anatomical studies, we made transversal and longitudinal sections along the entire inflorescence, including involucral bracts, analyzing them using an optical microscope. We confirmed that observed inflorescences are determinate, composed of a first-order dichasium, with second-order helicoidal branches forming a cephalioid structure. The involucral leaves differed from adjacent bracts, which did not display a constriction at the base, as commonly observed in leaves. Thus, we conclude that the congested inflorescence of Portulaca is not a capitulum, but a cephalioid with different degrees of branch reduction within the genus. The Pilosa clade displayed the most congested cephalioid compared to members of the other analyzed clades. We showed present to show a new interpretation of the congested inflorescences in Portulacaand reinforce the need to analyze solitary inflorescences to understand the importance of these data to systematics, evolution, and pollinator-plant interactions within Portulacaceae.

show abstract

Taxonomic differentiation among Portulaca minensis (Portulacaceae) and its allies occurring within the Espinhaço Range, Brazil, based on macro and microcharacters

Cited by 3 publications

References 40 publications

Inflorescence patterns within the genus Portulaca (Portulacaceae): analyses of anatomy and morphology, based on species occurring in Brazil

Inflorescence patterns within the genus Portulaca (Portulacaceae): analyses of anatomy and morphology, based on species occurring in Brazil

Communities structure and plant diversity in endangered canga (ironstone) vegetation: a reference ecosystem in the Brazilian semiarid region

Inflorescence patterns within the genus Portulaca (Portulacaceae): analyses of anatomy and morphology, based on species occurring in Brazil

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