Aspectos taxonômicos e distribuição geográfica de Julocroton Mart. (Euphorbiaceae)

Cordeiro, Inês

doi:10.1590/s0102-33061990000100006

Cited by 5 publications

(6 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A general review of geographic distribution patterns in the group is given by Cordeiro (1990), and a provisional enumeration of species accepted by Webster (1992 Monoecious shrubs; indumentum stellate; leaves alternate, pinnately veined, eglandular at base; stipules glandular-lobed or sometimes nearly entire; inflorescences terminal, without bisexual cymules; petals reduced in pistillate flowers; stamens 10-18; pistillate sepals with stipitate-glandular margins, subtended by an epicalyx of 5 smaller segments; styles multifid. Over 50 species of Julocroton have been described, the vast majority from South America, but despite the partial revision of Croizat (1943) the group remains very poorly understood.…”

Section: It Is Rather Doubtful That This Section Of 2 or 3 South Amermentioning

confidence: 99%

“…Over 50 species of Julocroton have been described, the vast majority from South America, but despite the partial revision of Croizat (1943) the group remains very poorly understood. A general review of geographic distribution patterns in the group is given by Cordeiro (1990), and a provisional enumeration of species accepted by Webster (1992).…”

Section: Croton Sect Octolobiummentioning

confidence: 99%

See 1 more Smart Citation

A provisional synopsis of the sections of the genus Croton (Euphorbiaceae)

Webster

1993

TAXON

151

190

View full text Add to dashboard Cite

JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. International Association for Plant Taxonomy (IAPT) is collaborating with JSTOR to digitize, preserve and extend access to Taxon. A provisional synopsis of the sections of the genus Croton (Euphorbiaceae) Grady L. Webster1 Summary Webster, G. L.: A provisional synopsis of the sections of the genus Croton (Euphorbiaceae). -Taxon 42: 793-823. 1993. -ISSN 0040-0262. The 19th century classification of Croton by Muller Argoviensis is highly artificial. A revised system that incorporates the sections proposed by Baillon and Grisebach is presented, with a key to the 40 sections recognized. For each section, types and synonymy are indicated, along with a description and list of representative species. Described as new are 2 sections (C. sect. Anadenocroton, sect. Corylocroton) and 3 subsections (C. subsect. Cuneati, subsect. Matourenses, subsect. Sampatik); 2 new sectional names (C. sect. Argyrocroton, sect. Luntia) represent changes in rank.Croton is a large and diverse genus of Euphorbiaceae comprising at least 800 species of the tropics and subtropics. In the most recent general synopsis of the family (Webster, 1994), it is associated in the tribe Crotoneae with the Old World genera Mildbraedia and Fahrenheitia. Croton differs from those genera in having staminate flowers with filaments inflexed in the bud, and pistillate flowers with the petals usually reduced. Furthermore, most species of Croton have a characteristic habit, with terminal thyrses of flowers that have mostly solitary pistillate flowers below and cymules of staminate flowers distally.The present article is a contribution towards a better understanding of phyletic relationships within the genus Croton. In contrast to the other large genera of Euphorbiaceae (e.g., Acalypha, Euphorbia, Phyllanthus), no coherent system of sections has heretofore been available in Croton. The classification of Muller (1866, 1873) was patently artificial (as Muller himself implied in various comments on individual species), and was criticized as such by Bentham (1880). Unfortunately, Pax (1890) accepted Miieller's system, and in the latest general treatment by Pax & Hoffmann (1931) Muller's taxa were retained but inflated in rank (by raising sections to subgenera, etc.). In contrast, Baillon (1858, 1861, 1864) and Grisebach (1859) recognized a considerable number of sections that by and large represent natural groups. These were cited in synonymy by Muller and Bentham, but have never been generally adopted because of the prevailing authority of the Miillerian system. In the 20th century, there have been a number of critical regional studies of 793 TAXON VOLUME 42 described many species and provided valuable discussions of interspecific relat...

show abstract

Section: It Is Rather Doubtful That This Section Of 2 or 3 South Amermentioning

confidence: 99%

Section: Croton Sect Octolobiummentioning

confidence: 99%

A provisional synopsis of the sections of the genus Croton (Euphorbiaceae)

Webster

1993

TAXON

151

190

View full text Add to dashboard Cite

show abstract

“…Pedersen -Amaranthaceae por Marchioretto et al (2004 Cordeiro (1990) para Julocroton humilis Diedr. -Euphorbiaceae, Giulietti & Pirani (1988) para espécies pertencentes a distintas famílias, e Wanderley (1990) para Orthophytum mello-barretoi L.B.…”

Section: Resultsunclassified

Padrões de distribuição geográfica das espécies de Euploca e Heliotropium (Heliotropiaceae) no Brasil

2009

View full text Add to dashboard Cite

RESUMO(Padrões de distribuição geográfica das espécies de Euploca e Heliotropium (Heliotropiaceae) no Brasil) Baseando-se na análise de espécimes advindos de 71 herbários nacionais e estrangeiros, trabalhos de campo e literatura especializada, foram determinados os padrões de distribuição geográfica das espécies dos gêneros Euploca e Heliotropium no Brasil. Foram detectados quatro padrões de distribuição geográfica e onze padrões biogeográficos. O centro de diversidade das espécies de Euploca no Brasil é a Região Nordeste. As espécies do gênero Heliotropium concentram-se, na sua maioria, na Região Sul, com o estado do Rio Grande do Sul representando o centro de diversidade do gênero no país. São apresentadas tabelas, mapas e discussões sobre a distribuição e respectivos padrões biogeográficos reconhecidos. Palavras-chave: Angiospermas, neotrópicos, padrões biogeográficos. ABSTRACT(Geographic distribution patterns of species of Euploca and Heliotropium (Heliotropiaceae) in Brazil) Based on an analysis of specimens from seventy-one national and international herbaria, field work and specialized literature, geographic distribution patterns of the species of the genera Euploca and Heliotropium in Brazil were determinate. Four geographic patterns and eleven biogeographic patterns were detected. The center of diversity of Euploca, in Brazil, is in the Northeast region. Species of the genus Heliotropium occur generally in the South region, with the center of diversity of the genus being found in Rio Grande do Sul State. Tables, maps and a discussion about the respective distribution and biogeographic patterns uncovered in this study are presented.

show abstract

“…Studies on essential oil of the stem bark and leaves from C. urucurana were also recorded [3b,3c]. Julocroton is a neotropical taxon with about 50 species concentrated in South America, found predominantly in open vegetation [4], as the savannas of eastern Brazilian Amazon, where occurs the herbaceous Julocroton triqueter (Lam.) Baill.…”

mentioning

confidence: 99%

“…The oil sample that we analyzed showed some similarity due to the significant percentage of β-caryophyllene and spathulenol, but the presence of β-phellandrene, also with high content, indicates the plant as a different chemical type. 1 Retention índex (DB-5ms column); 2 Croton draconoides, 3 C. urucurana, 4 Julocroton triqueter.…”

mentioning

confidence: 99%

Essential Oils Composition of Croton Species from the Amazon

Turiel

Ribeiro

Carvalho

et al. 2013

Natural Product Communications

View full text Add to dashboard Cite

The essential oils of leaves and twigs from the Euphorbiaceous Croton draconoides, C. urucurana and Julocroton triqueter were obtained and analyzed by GC and GC-MS. In total, 101 volatile constituents were identified, comprising an average of 90% of the oil, mostly made up of mono-and sesquiterpenes. The monoterpene hydrocarbons varied from 1.2 to 40.2%, the sesquiterpene hydrocarbons from 34.0 to 49.6% and the oxygenated sesquiterpenes from 11.5 to 51.3%. The main compounds found in the oil of C. draconoides were β-pinene (16.9%), α-pinene (16.5%), curzerene (12.8%), germacrene D (9.0%), γ-elemene (4.7%), and elemol (4.4%). The oil of C. urucurana showed sesquicineole (23.0%), dehydro-sesquicineole (13.8%), β-caryophyllene (7.9%), β-bisabolol (5.0%), germacrene D (4.2%) and β-elemene (4.1%) as the chief compounds. The oil of J. triqueter was dominated by β-caryophyllene (16.3%), β-phellandrene (10.2%), spathulenol (5.1%), caryophyllene oxide (5.0%), δ-cadinene (4.3%), (E)-nerolidol (4.3%), and α-copaene (4.1%).

show abstract

Aspectos taxonômicos e distribuição geográfica de Julocroton Mart. (Euphorbiaceae)

Cited by 5 publications

References 2 publications

A provisional synopsis of the sections of the genus Croton (Euphorbiaceae)

A provisional synopsis of the sections of the genus Croton (Euphorbiaceae)

Padrões de distribuição geográfica das espécies de Euploca e Heliotropium (Heliotropiaceae) no Brasil

Essential Oils Composition of Croton Species from the Amazon

Contact Info

Product

Resources

About