A revision of American Velloziaceae /

Smith, Lyman B.; Ayensu, Edward S.

doi:10.5962/bhl.title.122567

Cited by 16 publications

(28 citation statements)

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“…Além da morfologia externa, são apresentados caracteres anatômicos da lâmina foliar, largamente considerados na sistemática de Velloziaceae (e.g. Ayensu 1974, Coetzee 1974, Mello-Silva 1991, 2000, Menezes 1971, Menezes & Semir 1991, Menezes et al 1994, Smith & Ayensu 1974, 1976 e do pedicelo (Mello-Silva 1997, 2000. É apresentada e discutida, também, a sinonimização de Barbacenia fragrans (cujo parátipo foi coletado em São Paulo) e de B. tricolor sob B. tomentosa.…”

Section: Introductionunclassified

Novitates Velloziacearum florae phanerogamicae Sancti Pauli

Mello‐Silva

2004

Rev. bras. Bot.

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-(Novitates Velloziacearum florae phanerogamicae Sancti Pauli). Vellozia obtecta and V. peripherica, two new species of Velloziaceae from northern São Paulo and adjacent areas of Minas Gerais, are described. Their taxonomic relantionships and the characters supporting them as new species are considered. An account of their leaf and pedicel anatomy is also provided. The synonimization of Barbacenia fragrans and B. tricolor under B. tomentosa is also presented and discussed.Key words -Brazil, Minas Gerais, new species, new synonyms, São Paulo, Velloziaceae RESUMO -(Novitates Velloziacearum florae phanerogamicae Sancti Pauli). São descritas duas espécies novas de Velloziaceae do norte de São Paulo e áreas adjacentes de Minas Gerais, Vellozia obtecta e V. peripherica. São discutidos suas relações taxonômicas e os caracteres que as sustentam como novas. São fornecidas também descrições anatômicas da lâmina foliar e do pedicelo. A sinonimização de Barbacenia fragrans e B. tricolor sob B. tomentosa é também apresentada e discutida.Palavras-chave -Brasil, espécies novas, Minas Gerais, São Paulo, sinônimos novos, Velloziaceae IntroduçãoQuando do tratamento das Velloziaceae para a Flora do Estado de São Paulo, duas espécies novas foram delimitadas e são aqui descritas. Vellozia obtecta e V. peripherica habitam a região de Pedregulho e Rifaina, no norte do estado, em campos e afloramentos rochosos relacionados com as formações da Serra da Canastra, em Minas Gerais, onde estas espécies também ocorrem. Além da morfologia externa, são apresentados caracteres anatômicos da lâmina foliar, largamente considerados na sistemática de Velloziaceae (e.g.

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Section: Introductionunclassified

Novitates Velloziacearum florae phanerogamicae Sancti Pauli

Mello‐Silva

2004

Rev. bras. Bot.

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“…Since the African groups Talbotia and Xerophyta sensu Smith and Ayensu (1976) are hexaploid, Melo et al (1997) suggested that the Velloziaceae originated in South America.…”

Section: Velloziaceaementioning

confidence: 99%

Section: Velloziaceaementioning

confidence: 99%

“…The number and delimitation of the genera are controversial subjects, and two systems of classification (Smith and Ayensu, 1976;Menezes, 1980) with several conflicting points have been proposed for the family (see MelloSilva, 1994, for a detailed discussion). The classification of Menezes (1980) will be adopted in this paper, with the inclusion of the genera Barbaceniopsis, Nanuza and Talbotia from the system of Smith and Ayensu (1976). According to Menezes' system, the Vellozioideae comprise the genera Vellozia (South America) and Xerophyta, the latter corresponding to South American and African species, plus the genera Barbaceniopsis (Venezuela, Bolivia and Argentina), Talbotia (Africa, monotypic) and Nanuza (Brazil, monotypic) from Smith and Ayensu's (1976) system.…”

Section: Velloziaceaementioning

confidence: 99%

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Distribution and evolution of secondary metabolites in Eriocaulaceae, Lythraceae and Velloziaceae from "campos rupestres"

Salatino

Santos

et al. 2000

Genet. Mol. Biol.

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els such as genera, species and infraspecific categories. Another class of compounds that has deserved much attention, not only in plant but also in insect taxonomy, are hydrocarbons, in particular alkanes (Hamilton, 1995). Both classes of secondary metabolites combine the advantages of universal occurrence in vascular plants, chemical stability and the availability of rapid isolation and identification methods (Harborne, 1998).In spite of the widespread use of secondary metabolites in taxonomy they have never achieved the same status as characters for the establishment of phyletic relationships among plant taxa as macromolecules such as proteins and nucleic acids, which have recently received much attention in molecular systematics (Hillis et al., 1996). Inferences regarding the evolution of secondary metabolites depend on comparisons with dendrograms obtained through cladistic techniques based on wide sets of "traditional" morphologic or molecular characters. This paper discusses the development of secondary metabolite patterns in taxa of three families, Eriocaulaceae, Lythraceae and Velloziaceae, which are widely distributed in the campos rupestres, mountainous ecosystems found in the Espinhaço Mountains of the Brazilian States of Minas Gerais and Bahia. We also discuss the evolution of the distribution of secondary metabolites based on recent cladistic analyses, taking into account the distribution of secondary metabolites such as the flavonoids of Eriocaulaceae and Lythraceae, the alkanes of the foliar waxes of Velloziaceae and the fatty acids of Lythraceae. FLAVONOIDS EriocaulaceaeThe Eriocaulaceae are pantropical monocotyledons readily characterized by congested capitulla. The family comprises about 1100 species of which 700 occur in the New World, particularly on higher altitude mountains in Minas Gerais and Bahia (Giulietti and Pirani, 1988 AbstractHypotheses are presented on the evolution of structural patterns of secondary metabolites (flavonoids and foliar wax alkanes) and fatty acids of families of "campos rupestres". The distribution of fatty acids is given for genera of Lythraceae, with emphasis on Cuphea (supposedly more advanced) and Diplusodon. Compounds with saturated short chains represent a derived condition in Lythraceae although they are probably restricted to Cuphea. It is suggested that evolution selected for more complex flavonoid patterns in Cuphea, with the inclusion of C-glycoflavones and methoxylated flavonols (rhamnetin and isorhamnetin), which are not found in members of Diplusodon and Lafoensia. The supposedly primitive groups of Eriocaulaceae (e.g., Paepalanthus) presented more complex flavonoid patterns characterized by flavones and flavonols, the latter frequently being 6-hydroxylated or methoxylated. More advanced groups of Eriocaulaceae (e.g., Leiothrix and Syngonanthus) apparently possess only flavones, C-glycoflavones are a salient feature of species with smaller habits. In Velloziaceae, members of the primitive subfamily Vellozioideae show distribution of alkanes of foli...

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“…A moderna taxonomia da família iniciou-se com a revisão de Smith (1962) Segundo Salatino et al (1989), o estudo dos alcanos epicuticulares das folhas de Velloziaceae apóia a existência de duas subfamílias. Além disso, no primeiro trabalho de cladísitica com a família (Menezes et al 1994), os autores apontam que a subfamília Barbacenioideae, sensu Menezes (1980a) é monofilética e melhor sustentada que Barbacenioideae sensu Smith & Ayensu (1976 Menezes (1975) constatou a presença destas mesmas traqueídes nas folhas de espécies de Barbacenioideae.…”

Section: Introdução Geralunclassified

Anatomia em Velloziaceae: caracteres, evolução e filogenia

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A revision of American Velloziaceae /

Cited by 16 publications

References 0 publications

Novitates Velloziacearum florae phanerogamicae Sancti Pauli

Novitates Velloziacearum florae phanerogamicae Sancti Pauli

Distribution and evolution of secondary metabolites in Eriocaulaceae, Lythraceae and Velloziaceae from "campos rupestres"

Anatomia em Velloziaceae: caracteres, evolução e filogenia

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