The Gunnera gallery: some literature 


Images and an introduction to the plant family Gunneraceae

Plant parts

Biogeography

Fossils

'Gunneralikes'

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

For further information on Gunnera, try some of the sources below.

On the symbiosis with cyanobacteria, see

  • Benson, J. & Margulis, L. 2002. The Gunnera manicata - Nostoc symbiosis: is the red stipulate tissue symbiogenetic? Biology and Environment: Proceedings of the Royal Irish Academy 102b: 45–48.
  • Bergman, B., Johansson, C. & Söderbäck, E. 1992. Tansley Review No. 42: the Nostoc Gunnera symbiosis. New Phytologist 122: 379–400.
  • Osborn, B., F. Doris, A. Cullen, R. McDonald, G. Campbell & M. Steer. 1991. Gunnera tinctoria: An unusual nitrogen-fixing invader. BioScience 41: 224–234.

On Anatomy, see the excellent studies by Hazel Wilkinson:

  • Wilkinson, H. 1998. Gunneraceae. Pp. 260-272 in D. F. Culter & M. Gregory (eds.) Anatomy of the Dicotyledons, second edition, Vol. 4. Oxford: Clarendon Press
  • Wilkinson, H. 2000. A revision of the anatomy of Gunneraceae. Botanical Journal of the Linnean Society 134: 233-266

An overview of morphology but detailed
consideration of
leaves, and a discussion of evolutionary relationships, biogeography and macrosystematics (based on moprhology and anatomy) see:

The most active researcher on Gunnera at present is Dr. Livia Wanntrop at Stockholm University, who has published a series of studies on systematics, evoltuion and biogeography of Gunnera based on cladistic analysis of some genetic loci. Her publications are listed here. There are some differences in the hypothesized evolutionary relationships resulting from these studies and those of Fuller and Hickey (above), who contend that living Saxifragaceae provide a better morphological (and ecological) model for the Cretaceous ancestors of Gunnera (and perhaps the specialized Myrothamnus as well; for a detailed description of one of these species see this paper by Moore et al. 2007).

  • In recent years authorities (starting with Takhtajan 1997) have elevated Gunnera into its own order Gunnerales, which is also thought to include the acquatic family Myrothamnaceae on the basis of recent gene-based cladistic macro-phylogenies (see, e.g. the Angiopserm Phylogeny Group website). This placement was taken as a baseline assumption in the within Gunnera studies of Wanntorp and colleagues. Fuller and Hickey would contend that this does not best explain the morphological evolution and historical biogeography of Gunnera and the suggested placement with Myrothamnus could be an artefact of the cladistic methodology such as "long branch attraction".

  • Clearly further research is warranted!

  • On the fossil record, especially fossil pollen:

    • Jarzen, D. M. 1980. The occurrence of Gunnera pollen in the fossil record. Biotropica 12: 117–123.
    • Jarzen, D. M. & M. E. Dettmann. 1989. Taxonomic revision of Tricolpites reticulatus Cookson ex Couper, 1953 with notes on the biogeography of Gunnera L. Pollen & Spores 31: 97–112.
  • Subgenera

    Biogeography

    Fossils

    Some literature