Topic
Malaxis
About: Malaxis is a research topic. Over the lifetime, 76 publications have been published within this topic receiving 331 citations.
Papers published on a yearly basis
Papers
TL;DR: The traditional classification system of the tribe using characters primarily related to floral morphology does not reflect the evolutionary history of these taxa, and it seems evident that Malaxideae will need to be divided into at least seven genera.
Abstract: Nuclear ITS and plastid matK sequences were collected for 71 taxa of Malaxideae (Orchidaceae). Resulting cladograms are highly resolved and well supported by jackknife analyses. These indicate that the traditional classification system of the tribe using characters primarily related to floral morphology does not reflect the evolutionary history of these taxa. Rather, the tribe is split into two major clades: one of terrestrial species and another of epiphytes. Within the epiphytic clade, taxa with laterally compressed leaves (Oberonia) are monophyletic, whereas the remaining taxa (Liparis pro parte) have elongate conduplicate leaves and form a paraphyletic grade of at least two additional monophyletic lineages. Within the terrestrial clade, taxa with plicate leaves (Liparis p.p. and Malaxis p.p.) clearly separate from taxa with conduplicate leaves (Liparis p.p. and Malaxis p.p.). Although further taxon sampling should take place before nomenclature is changed, it seems evident that Malaxideae will need to be divided into at least seven genera. Furthermore, the transition from epiphytic to terrestrial habit is documented to have occurred only once in Malaxideae, and the value of vegetative over reproductive features in classifying some groups of orchids is again demonstrated.
118 citations
TL;DR: The taxonomy of the genus Malaxis is still obscure, even though many researchers have attempted clarification in the past 200 years, and most authors have followed treatments of Schlechter (1911) and Seidenfaden (1978).
Abstract: Malaxis Solander ex Swartz (1788), the main genus of the tribe Malaxideae (Orchidaceae), consists of about 300 species that are widespread in the tropics and subtropics of the old and new worlds. Only one species of this genus, namely Malaxis monophyllos (Linneaus, 1753: 947) Swartz (1800: 234), has previously been recorded from China (Chen et al. 2009). The taxonomy of the genus is still obscure, even though many researchers have attempted clarification in the past 200 years. (Ridley 1888, Smith 1930, Schlechter 1911, Seidenfaden 1978, Dressler 1993). Undoubtedly, Malaxis is polyphyletic (Cameron 2005, Pridgeon et al. 2006). Most authors have followed treatments of Schlechter (1911) and Seidenfaden (1978) in accepting a broadly defined Malaxis (Smith 1930, Dressler 1993, Chen, 1999).
52 citations
TL;DR: The abundance of dead standing trees in the forest, a surrogate variable of forest age, was positively related to abundance of orchids of the genus Malaxis, orchid richness and orchid abundance, and concurs with previous studies that suggest that natural disturbance is a key process for orchid survival.
Abstract: The response of organisms to anthropogenic or natural modification of the environment is one of the most important questions in conservation biology and ecological theory. In spite of the fact that orchids are one of the most studied groups of plants, little information exists regarding their response to habitat alteration. The few existing studies are biased toward European orchid species and no consensus exists with regard to the response of orchids to human and natural disturbance. In this study, we sampled 30 transects (0.1 ha each) of oak forest located in Morelos, Central Mexico, and measured 13 variables related to forest aging and stump abundance, and six variables of orchid species richness and abundance. Neither abundance nor the richness and specific abundance of orchid genus or species were related to timber extraction. The abundance of dead standing trees in the forest, a surrogate variable of forest age, was positively related to abundance of orchids of the genus Malaxis, orchid richness and orchid abundance. This finding suggests that the conservation of all facets of the studied forest orchid community is dependent on natural processes (such as self-thinning) and the maintenance of older areas of the forest, and concurs with previous studies that suggest that natural disturbance is a key process for orchid survival.
20 citations
TL;DR: The tribe Malaxideae (Orchidaceae, subfamily Epidendroideae) in Madagascar and adjacent archipelagos is revised and the four genera: Liparis, Malaxis, Oberonia and Stichorkis are described.
Abstract: Summary. The tribe Malaxideae (Orchidaceae, subfamily Epidendroideae) (sensu Pridgeon et al. 2005: 453) in Madagascar and adjacent archipelagos is revised. In this region it comprises the four genera: Liparis, Malaxis, Oberonia and Stichorkis. All of the species are described and their typification, history, identification, distribution and habitat are discussed. Conservation assessments and distribution maps are included. A checklist of the genera and species and a key to their identification are provided. Six new species: Liparis bemarahensis, L. bosseri, L. chantaliae, L. laurentii, L. magnifica and L. superclareae are described.
15 citations
14 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 2 |
| 2020 | 2 |
| 2019 | 1 |
| 2018 | 1 |
| 2016 | 4 |
| 2015 | 3 |