Topic
Anginon
About: Anginon is a research topic. Over the lifetime, 7 publications have been published within this topic receiving 339 citations.
Papers
TL;DR: Topology, along with evidence from morphology, anatomy, geographic distribution, and insertions and deletions in matK sequences, suggests that subfamily Apioideae may have originated in southern Africa from woody, simple-leaved ancestors.
Abstract: Phylogenetic relationships among the genera of Apiaceae are poorly understood, and the commonly employed systems of classification of this family are widely regarded as artificial. The understand- ing of evolutionary relationships in Apiaceae has been hampered by difficulties in interpreting traditional taxonomic characters, especially fruit characters. A cladistic analysis of 53 sequences from the chloroplast gene matK was used to provide a phylogenetic perspective for interpreting evolutionary patterns and relationships in Apiaceae. Results of the analysis of mnatK sequence data are in conflict with the subfamilial and tribal treatment of Cerceau-Larrival, as well as the tribal system of Drude. matK sequence data do support much of Drude's subfamilial system, suggesting subfamilies Apioideae and Saniculoideae are largely monophyletic. The saniculoid genus Lagoecia, however, is found among the apioids and should perhaps be transferred to that subfamily. Three of the apioid genera analyzed (Bupleurum, Anginon, and Heteromorpha) are placed in basally-branching clades within subfamily Apioideae. This topology, along with evidence from morphology, anatomy, geographic distribution, and insertions and deletions in matK sequences, suggests that subfamily Apioideae may have originated in southern Africa from woody, simple-leaved ancestors. Relationships among the remaining taxa of Apioideae agree largely with other recent molecular studies, and suggest that the carpological characters used to construct older systems of classification have been prone to parallel evolution.
154 citations
TL;DR: The resultant phylogenies indicate that the apioid genera Polemanniopsis and Steganotaenia form a clade sister to Apiaceae subfamily Saniculoideae and the African genera Anginon, Dracosciadium, Glia, Heteromorpha, and Polemannia also comprise aClade and likely represent the most basal elements within Apioideae.
Abstract: Evolutionary relationships among 48 genera of Apiaceae (Umbelliferae) were inferred using maximum parsimony, maximum-likelihood, and neighbor-joining analyses of chloroplast DNA rps16 intron and adjacent rps16 3prime exon sequences. Emphasis was placed on woody members of Apiaceae subfamily Apioideae endemic to southern Africa, a region hypothesized to be the place of origin of this largely herbaceous subfamily. The resultant phylogenies were highly concordant and indicate that the apioid genera Polemanniopsis and Steganotaenia form a clade sister to Apiaceae subfamily Saniculoideae. The African genera Anginon, Dracosciadium, Glia, Heteromorpha, and Polemannia also comprise a clade and likely represent the most basal elements within Apioideae. Heteromorpha, however, is not monophyletic, with Heteromorpha arborescens (Spreng.) Cham. & Schltdl. var. abyssinica (A. Rich.) H. Wolff and Heteromorpha arborescens (Spreng.) Cham. & Schltdl. var. arborescens arising in separate subclades. Progressing up the trees,...
101 citations
TL;DR: Anginon, a hitherto poorly known genus of woody Apiaceae endemic to southern Africa, is revised and a formal taxonomic treatment is presented, including a key to the species, correct nomenclature, typification, descriptions and distribution maps.
Abstract: Anginon, a hitherto poorly known genus of woody Apiaceae endemic to southern Africa, is revised. Field studies over several years have shown that 12 species can be recognised, of which five are newly described: A. ternatum, A. fruticosum, A. pumilum, A. tenuior and A. intermedium. The new combination A. streyi is made to transfer Sonderina streyi to Anginon, with which it shares the woody habit and heavily cutinised outer cell walls of the fruit epidermis. A formal taxonomic treatment is presented, including a key to the species, correct nomenclature, typification, descriptions and distribution maps.
16 citations
TL;DR: The interpretation of character evolution within the genus and a first hypothesis of phylogenetic relationships, showing three distinct infrageneric groups, is presented.
Abstract: The variation in habit and morphology of the twelve species of Anginon, a poorly known southern African genus of woody Apiaceae, is discussed and illustrated. The genus Glia is shown to be the obvious outgroup, sharing with Anginon two convincing synapomorphies: 1, the reduction or partial reduction of the laminar part of the leaves, and 2, the heavily cutinized outer walls of the fruit epidermis. Several characters of the internal structure of the fruit, together with other morphological characters, have been analysed by the cladistic method. Our interpretation of character evolution within the genus and a first hypothesis of phylogenetic relationships, showing three distinct infrageneric groups, is presented.
13 citations
TL;DR: Seven species and one genus of South African Umbelliferae are recorded for the first time, and the number for Itasina (2n = 24) is of considerable interest and indicates that a detailed chromosome study of the South African genera Annesorhiza and Chamarea may yield valuable taxonomic information.
1 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2011 | 1 |
| 2008 | 1 |
| 2004 | 1 |
| 1999 | 1 |
| 1997 | 2 |
| 1996 | 1 |