Taxonomic description and pollination ecology of Cyrtorchis okuensis (Orchidaceae, Angraecinae), a new species endemic to the Cameroon Volcanic Line

Azandi, Laura; Stévart, Tariq; Sonké, Bonaventure; Simo‐Droissart, Murielle; D'haijère, Tania; Droissart, Vincent

doi:10.5091/plecevo.2021.1823

Cited by 2 publications

(1 citation statement)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The newly described M. nguemae (= Taeniorrhiza sp. nov.) possesses the longest nectar spur in Microcoelia , which approaches the lower bound of a typical hawkmoth pollination syndrome (Johnson & al., 2017; Azandi & al., 2021). The new species is also notable for the asymmetric distribution of pneumathodes along its roots (Fig.…”

Section: Discussionmentioning

confidence: 99%

A single origin of leaflessness in Afro‐Malagasy angraecoids (Orchidaceae, Angraecinae)

Farminhão,

Biteau,

Yakhouba

et al. 2023

TAXON

Self Cite

View full text Add to dashboard Cite

Microcoelia and the monospecific Taeniorrhiza and Chauliodon are notable among Afrotropical angraecoid orchids for being leafless. However, the affinity among these genera was not addressed in previous molecular phylogenetic studies, thus precluding the understanding of how many times has leaflessness evolved in angraecoids. The discovery of an additional species ascribable to Taeniorrhiza in Gabon, and a revision of all material referrable to this genus in herbarium collections, created the possibility to investigate the phylogenetic position of Taeniorrhiza relative to Microcoelia and Chauliodon. Based on phylogenetic inference using ITS-1 and two plastid regions (matK/trnK, trnL-trnF), and including 20 of the 34 species of Microcoelia recognised prior to our study, we here demonstrate that Taeniorrhiza and Chauliodon are deeply imbedded in Microcoelia, and are thus treated here as synonyms of the last. Accordingly, we describe the novelty from Gabon as a new species of Microcoelia: Microcoelia nguemae sp. nov. The new species is illustrated with colour photographs, and also with line drawings. Its preliminarily IUCN conservation status is provided. The novelty is notable for the dorsiventrally asymmetric distribution of pneumathodes along its roots and for bearing the longest lip spur in this Afro-Malagasy epiphytic genus. The new phylogenetic framework suggests a single origin of leaflessness in Afrotropical angrecoids and reveals the informative value of the rostellum to reconstruct relationships within Microcoelia. This serves as the basis of a newly proposed sectional treatment for Microcoelia, recognising 37 species, one new section, a new status for the defunct genus Encheiridion and the redefinition of Microcoelia sect. Microcoelia and sect. Brachyglossa.

show abstract

Section: Discussionmentioning

confidence: 99%

A single origin of leaflessness in Afro‐Malagasy angraecoids (Orchidaceae, Angraecinae)

Farminhão,

Biteau,

Yakhouba

et al. 2023

TAXON

Self Cite

View full text Add to dashboard Cite

show abstract

Orchids, hawkmoths and Darwin revisited: How adaptation to pollination by hawk-moths spurred the speciation of Old and New World angraecoids

Farminhão,

Collobert,

Perez-Lamarque

et al. 2024

Preprint

View full text Add to dashboard Cite

Specialised pollination has often been proposed as a major driver of the unrivalled diversification of angiosperms. With its unparalleled variation in flower depth, ranging from spurless to 40 cm spurred flowers pollinated by hawkmoths, angraecoid orchids (Angraecinae) provide unique opportunities to reveal the impact of floral specialisation on diversification rates in the Afrotropics and Neotropics. We compiled floral characters for 327 angraecoid species, and assigned these species to newly formalised floral syndrome categories calibrated against pollination case studies. We then estimated ancestral character states and state-dependent speciation rates using the latest time-calibrated phylogeny of angraecoids. We found that white flowers consistent with micro-sphingophily (2 cm≥ spurs <8.7 cm), macro-sphingophily (8.7 cm≥ spurs <18.6 cm) and mega-sphingophily (spurs ≥18.6 cm) evolved repeatedly in angraecoids, and are ancestral in some non-sphingophilous clades. Reversals to non-sphingophily and pigmented flowers suggest higher evolutionary lability of these traits than what is traditionally thought. Increasing floral specialisation with long spurs does not seem to enhance angraecoid orchids’ speciation rates, since micro-sphingophily appears to be associated with the highest speciation rates. An abundance of short-proboscid hawkmoths in Madagascar, as an ecological opportunity, may have accelerated the speciation of micro-sphingophilous taxa.

show abstract

Taxonomic description and pollination ecology of Cyrtorchis okuensis (Orchidaceae, Angraecinae), a new species endemic to the Cameroon Volcanic Line

Cited by 2 publications

References 30 publications

A single origin of leaflessness in Afro‐Malagasy angraecoids (Orchidaceae, Angraecinae)

A single origin of leaflessness in Afro‐Malagasy angraecoids (Orchidaceae, Angraecinae)

Orchids, hawkmoths and Darwin revisited: How adaptation to pollination by hawk-moths spurred the speciation of Old and New World angraecoids

Contact Info

Product

Resources

About