Topic
Podocalyx
About: Podocalyx is a research topic. Over the lifetime, 2 publications have been published within this topic receiving 31 citations.
Papers
1 Jan 2012
TL;DR: Euphorbiaceae sensu lato are distributed mainly in the tropics, in various types of vegetation and habitats, being one of the largest, most complex and diverse families of angiosperms as discussed by the authors.
Abstract: Euphorbiaceae sensu lato are distributed mainly in the tropics, in various types of vegetation and habitats, being one of the largest, most complex and diverse families of angiosperms. It has recently been divided into four families, according to classification systems based on molecular phylogeny: Euphorbiaceae sensu stricto, Phyllan- thaceae, Putranjivaceae, and Picrodendraceae. There is a proposition to establish Peraceae still under discussion. There were also changes in the taxonomic position of genera widely distributed in the Brazilian territory, such as Amanoa, Drypetes, Pera, Phyllanthus, Podocalyx, Pogonophora, and Richeria, among others. In addition, new species have been proposed and the limits of taxa distribution are expanding in Brazil. Thus, the authors provide an overview of recent studies and advances in the taxonomy of Euphorbiaceae s.l. in the Northern, Northeastern, Southeastern and Southern regions of Brazil, concentrating on review works and regional floras, as well as the changes that resulted in setting a new taxonomic family.
26 citations
TL;DR: The morphology of Paradrypetes, particularly of its leaves and pollen, suggests that this genus is a primitive member of that subfamily of Euphorbiaceae, and its closest relative appears to be Podocalyx, in the tribe Podocalyceae, but numerous differences between these genera justify placing it in its own subtribe.
Abstract: ABsTsRicr. Paradrypetes, a small genus known only from Brazil, has been placed near Drypetes in subfam. Phyllanthoideae, in subfam. Oldfieldioideae, and even excluded from the Euphorbiaceae altogether. In light of recent studies of the Oldfieldioideae, the morphology of Paradrypetes, particularly of its leaves and pollen, suggests that this genus is a primitive member of that subfamily. Its closest relative appears to be Podocalyx, in the tribe Podocalyceae, but numerous differences between these genera justify placing Paradrypetes in its own subtribe, the Paradrypetinae, G. Levin newly described herein. Two species of Paradrypetes are recognized, including a new species, Paradrypetes subintegrifolia. Paradrypetes Kuhlmann is a small Brazilian genus of Euphorbiaceae that has long been regarded as of uncertain relationships. When Kuhlmann (1935) described P. ilicifolia, heretofore the sole known species, he placed the genus in the subfam. Phyllanthoideae Webster because of its biovulate locules. He noted that the genus differed strikingly in its opposite leaves and epipetiolar inflorescences from all other members of the subfamily known to him. Despite these differences he suggested that it was related to Drypetes M. Vahl, which he stated was generally similar morphologically and specifically shares drupaceous fruits. The accompanying anatomical study by Milanez (1935) was interpreted to reinforced these conclusions but added further differences between the genera, particularly the presence of raphides, a crystal type otherwise absent in the Euphorbiaceae, throughout the primary tissues of Paradrypetes.
6 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2012 | 1 |
| 1992 | 1 |