Phylogenetic Analysis of Inter- and Infrageneric Relationships of Leiothrix Ruhland (Eriocaulaceae)

Giulietti, Ana María; Amaral, Maria C. E.; Bittrich, Volker

doi:10.2307/4114608

Cited by 48 publications

(60 citation statements)

References 7 publications

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“…Aphorocaulon species. They were different from the other groups of Paepalanthus, confirming the polymorphism of the genus presented by Giulietti et al (1995). The roots of the Aphorocaulon species were thin and uniform.…”

Section: Discussionmentioning

confidence: 60%

“…The morphological variation among the species of Paepalanthus was previously mentioned by Scatena et al (1998), where the species grew either on stone or rock, or in recently decomposed stony soils, or in sandy soils that could be either humid or dry. Giulietti et al (1995) described that; the habitat variability, associated to the great habit diversity in Paepalanthus turned the genus into highly polymorphic. All the species studied presented a similar habit and characterized the subsect.…”

Section: Discussionmentioning

confidence: 99%

“…They form frequent components of the vegetation in montane shallow pools or swamps, especially on sandy ground. The greatest concentration of species is in South America, especially in the rock savannas ("campos rupestres") of Minas Gerais and Bahia (Brazil) and on the table mountains ("Tepuis") of South Venezuela (Giulietti et al, 1995). Paepalanthus species grows in several habitats.…”

Section: Introductionmentioning

confidence: 99%

“…Such variability of habitats associated to the great morphological diversity of habits (it includes from plants of some millimeters up to 2m of height), of inflorescence, of flowers, and of fruits and seeds. That turns the genus into highly polymorphic, having been besides recognized recently as paraphyletic by Giulietti et al (1995). Some species of Paepalanthus as P. bromelioides, P. microphyllus, P. paulinus, P. robustus, P. scleranthus and P. speciosus were studied by Castro (1986) and Castro & Menezes (1995) who described the anatomy of the vegetative organs, specially of the leaves.…”

Section: Introductionmentioning

confidence: 99%

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Morphology and anatomy of the vegetative organs and scapes from Aphorocaulon (Paepalanthus, Eriocaulaceae)

Scatena

Rosa

2001

Braz. arch. biol. technol.

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Section: Discussionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Morphology and anatomy of the vegetative organs and scapes from Aphorocaulon (Paepalanthus, Eriocaulaceae)

Scatena

Rosa

2001

Braz. arch. biol. technol.

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“…O primeiro estudo cladístico para Eriocaulaceae foi proposto por Giulietti et al (1995), apresentando Paepalanthus como um gênero polifilético. Uma análise mais recente apresentou uma árvore de consenso estrito para dados anatômicos e macromorfológicos, confirmou o polifiletismo de Paepalanthus e sugeriu que este gênero deveria ser dividido em vários pequenos grupos monofiléticos (Giulietti et al 2000).…”

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Anatomia das folhas, brácteas e escapos de Actinocephalus (Koern.) Sano (Eriocaulaceae)

2005

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-(Anatomy of the leaves, bracts and scapes of Actinocephalus (Koern.) Sano (Eriocaulaceae)). The anatomy of the leaves, bracts and scapes of 20 species (41 specimens) of Actinocephalus from the "campos rupestres" of Brazil were studied. Our aim was the characterization of this new genus in an anatomical basis, besides elucidating some ecological aspects of the group. The leaves and bracts are similar, presenting an uniseriate epidermis, with elongated cells in longitudinal orientation; stomata on the abaxial surface, with substomatal chambers; loosely aggregated chlorenchyma; collateral vascular bundles enclosed in a double sheath, and parenchymatous bundles sheath extensions. The scapes present an uniseriate epidermis; substomatal chambers; loosely aggregated chlorenchyma; discontinuous endodermis; sinuous pericycle and collateral vascular bundles. The presence of elongated cells in longitudinal orientation in the epidermis as well as in the vascular bundles sheath extensions in the leaves and bracts, besides discontinuous endodermis in the scapes and substomatal chambers in the three organs studied are consistent characters for the genus. The anatomical characteristics of the organs studied are mesomorphic.Key words -Actinocephalus, anatomy, bracts, leaves, scapes RESUMO -(Anatomia das folhas, brácteas e escapos de Actinocephalus (Koern.) Sano (Eriocaulaceae)). Estudou-se a anatomia das folhas, brácteas e escapos de 20 espécies (41 espécimes) de Actinocephalus, que ocorrem nos campos rupestres do Brasil, visando caracterizar anatomicamente o novo gênero proposto para a família, além de elucidar alguns aspectos ecológicos do grupo. As folhas e as brácteas são anatomicamente semelhantes entre si e apresentam epiderme unisseriada, com células alongadas no sentido longitudinal; estômatos na face abaxial, com câmaras subestomáticas; parênquima clorofiliano frouxo; feixes vasculares colaterais envolvidos por bainha dupla e extensão de bainha dos feixes constituída por células parenquimáticas alongadas. Os escapos apresentam epiderme unisseriada; câmaras subestomáticas; parênquima clorofiliano frouxo; endoderme descontínua; periciclo sinuoso e feixes vasculares colaterais. A presença de células alongadas tanto na epiderme como nas extensões de bainha dos feixes vasculares nas folhas e nas brácteas, assim como endoderme descontínua nos escapos e câmara subestomática nos três órgãos estudados são caracteres consistentes para o gênero. As características anatômicas dos órgãos estudados são mesomórficas.

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Comparative embryology and taxonomic considerations in Eriocaulaceae (Poales)

2010

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The genus concept within Eriocaulaceae is widely discussed because it is mainly based on a small number of floral characteristics of unknown functional and evolutionary significance. The aim of the present work is to comparatively study the embryology of representatives of most genera of Eriocaulaceae to identify relevant features that might aid in circumscribing them. In Eriocaulaceae, the uniformity of the embryological characteristics makes it difficult to interpret the existing relationships among the genera. Some embryological characteristics, especially those related to the number of microsporangia, are shown to be unstable and restricted to Paepalanthoideae. The unique pollen morphology may be related to mechanical processes to accommodate the increase in volume after early formation of the pollen wall and may indicate a relationship to an inaperturate ancestor. The placentation, formerly stated to be axile, is more likely to be central due to protusions of the locular base. The shape of the proximal region of the megagametophyte may be responsible for the formation of the antipodal cyst. The seed coat structure is uniform in origin and is a consistent taxonomic characteristic of the family. A review of Eriocaulaceae is necessary, in which additional morphological and anatomical characteristics should be considered and combined.

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Phylogenetic Analysis of Inter- and Infrageneric Relationships of Leiothrix Ruhland (Eriocaulaceae)

Cited by 48 publications

References 7 publications

Morphology and anatomy of the vegetative organs and scapes from Aphorocaulon (Paepalanthus, Eriocaulaceae)

Morphology and anatomy of the vegetative organs and scapes from Aphorocaulon (Paepalanthus, Eriocaulaceae)

Anatomia das folhas, brácteas e escapos de Actinocephalus (Koern.) Sano (Eriocaulaceae)

Comparative embryology and taxonomic considerations in Eriocaulaceae (Poales)

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