Skip to main content

Free Content Taxonomic changes in C3 Cyperus (Cyperaceae) supported by molecular data, morphology, embryography, ontogeny and anatomy

Download Article:
 Download
(PDF 4731.3515625 kb)
 
Background and aims – Recent molecular studies validate a broad definition of Cyperus (Cyperaceae) uniting genera previously scattered in Cyperoideae. First indication of their affinity with Cyperus was obtained through embryography. Cyperus consists of a paraphyletic C3 Cyperus and monophyletic C4 Cyperus. In this study, we aim to check and clarify the putative positions of the segregate genera in C3 Cyperus. Additional information is given and remarks are made on the position of some as yet unplaced species or sections in the C3 Cyperus phylogeny.

Methods – Embryos of Cyperus constanzae and C. gardneri were cleared and drawn. Inflorescences of selected C3 Cyperus species were investigated using scanning electron and light microscopy. Histochemical tests were performed to assess the presence of suberin in the 'corky' tissue of the nutlets of Cyperus pectinatus.

Key results – Embryography not only supports tribal classification in Cyperoideae, it is also phylogenetically informative in C3 Cyperus. Morphology and ontogeny support molecular phylogenetic results suggesting the inclusion of the segregate genera in C3 Cyperus as new sections or in established sections, and confirm the need to broaden the circumscription of some of these sections.

Conclusion – Although less diverse than C4 Cyperus, C3 Cyperus includes clades which evolved an exceptional morphological diversity compared to its limited species numbers. The segregate genera Courtoisina (deciduous spikelets), Kyllingiella (spirally-arranged glumes) and Oxycaryum (spirally- arranged glumes and dorsiventrally flattened dimerous gynoecia), and the taxon Anosporum (recognised at sectional, subgeneric or generic level) are here included in C3 Cyperus (= Cyperus subg. Anosporum) as sections or included in an existing section (Kyllingiella is included in Cyperus sect. Leucocephali). A formal taxonomic revision is presented with relevant new names and combinations, synonyms, diagnoses and identification keys.

56 References.

No Supplementary Data.
No Data/Media
No Metrics

Keywords: ANATOMY; CYPERACEAE; CYPERUS; EMBRYOGRAPHY; MOLECULAR PHYLOGENY; MORPHOLOGY; ONTOGENY; TAXONOMY

Document Type: Research Article

Publication date: 2011-11-01

More about this publication?
  • Plant Ecology and Evolution (a continuation of Belgian Journal of Botany, incorporating Systematics and Geography of Plants) is an international journal devoted to ecology, phylogenetics and systematics of all 'plant' groups in the traditional sense (including algae, cyanobacteria, fungi, myxomycetes), also covering related fields such as comparative and developmental morphology, conservation biology, ecophysiology, evolution, phytogeography, pollen and spores, population biology, and vegetation studies. It is published by the Royal Botanical Society of Belgium and the Botanic Garden Meise and contains original research papers, review articles, checklists, short communications and book reviews.

  • Editorial Board
  • Submit a Paper
  • Subscribe to this Title
  • Belgian Journal of Botany
  • Systematics and Geography of Plants
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more