An introduction to Caladenia R.Br. – Australasia’s jewel among terrestrial orchids

Kingsley W. Dixon; Stephen D. Hopper

doi:10.1071/BT09999

PREFACE

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An introduction to Caladenia R.Br. – Australasia’s jewel among terrestrial orchids

Kingsley W. Dixon ^A ^B ^D and Stephen D. Hopper ^A ^C

+ Author Affiliations

- Author Affiliations

^A School of Plant Biology, The University of Western Australia, Nedlands, WA 6009, Australia.

^B Botanic Gardens and Parks Authority, Kings Park and Botanic Garden, West Perth, WA 6005, Australia.

^C Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3AB, UK.

^D Corresponding author. Email: kdixon@bgpa.wa.gov.au

Australian Journal of Botany 57(4) i-vii https://doi.org/10.1071/BT09999
Published: 29 July 2009

Abstract

Caladenia is a genus of more than 250 species of geophytic orchids in the Tribe Diurideae endemic to the Australasian Region. The genus in this broad sense has an exceptional diversity of insect pollination adaptations among its colourfully adorned species, from food-rewarding generalists to specialists achieving pollination by sexual deception of male thynnid wasps. The exploration of diversity in Caladenia involves many of the great names in the foundation of Australasian plant systematics, as well as reflecting a remarkable second phase of discovery and description over the past three decades. Molecular phylogenetics has greatly clarified relationships of Caladenia and established six major clades within the genus. Some researchers regard these clades as genera themselves, whereas they are treated as subgenera herein to maximise nomenclatural stability and information retrieval. More work is needed to adequately document relationships within each of these clades, and disputed matters of typification greatly influence nomenclature applied to many species if the six clades are recognised as genera. Given the relatively recent and ongoing discovery of so many new species in Caladenia, the biology of these orchids is only now being documented comprehensively. Significant advances in pollination ecology, mycorrhizal studies, horticulture and conservation biology are emerging that highlight the extraordinary ecological sensitivity and conservation vulnerability of the genus. Indeed, the high species number and complex biotic connections have resulted in no other genus of terrestrial orchids possessing such a large number of rare and threatened taxa. Some of this rich body of new data is presented by a diverse range of laboratories and researchers in this special issue.

References

Alcock J (2006) ‘An enthusiasm for orchids: sex and deception in plant evolution.’ p. 193. (Oxford University Press: New York)

Anderson AB (1991) Symbiotic and asymbiotic germination and growth of Spiranthes magnicamporum (Orchidaceae). Lindleyana 6, 183–186.

Batty AL, Brundrett MC, Dixon KW, Sivasithamparam K (2006a) New methods to improve symbiotic propagation of temperate terrestrial orchid seedlings from axenic culture to soil. Australian Journal of Botany 54, 367–374.
| Crossref | GoogleScholarGoogle Scholar |

Batty AL, Brundrett MC, Dixon KW, Sivasithamparam K (2006b) In situ symbiotic seed germination and propagation of terrestrial orchid seedlings for establishment in field sites. Australian Journal of Botany 54, 375–381.
| Crossref | GoogleScholarGoogle Scholar |

Batty AL, Dixon KW, Brundrett MC, Sivasithamparam K (2001) Constraints to symbiotic germination of terrestrial orchid seed in a mediterranean bushland. New Phytologist 152, 511–520.
| Crossref | GoogleScholarGoogle Scholar |

Bentham G (1873) ‘Flora Australiensis. Vol. VI’. (L. Reeve & Co.: Ashford)

Bonnardeaux Y, Brundrett M, Batty AL, Dixon KW, Koch J, Sivasithamparam K (2007) Diversity of mycorrhizal fungi of terrestrial orchids: compatibility webs, brief encounters, lasting relationships and alien invasions. Mycological Research 111, 51–61.
| Crossref | GoogleScholarGoogle Scholar | PubMed |

Booth C , Traill B (2008) Conservation of Australia’s outback wilderness. Pew Environment Group & The Nature Conservancy. Wild Australia Program, Sydney.

Brown R (1810) ‘Prodromus Florae Novae Hollandiae et Insulae Van-Diemen exhibens characteres plantarum quas annis 1802–1805’. (Taylor: London)

Brown A , Dundas P , Dixon KW , Hopper SD (2008) ‘An illustrated guide to the orchids of Western Australia.’ (University of Western Australia Press: Perth)

Cramer VA , Hobbs RJ (2007) ‘Old fields: dynamics and restoration of abandoned farmland.’ (Society for Ecological Restoration, Island Press: Washington)

Dixon KW (1991) Seeder/clonal concepts in Western Australian orchids. In ‘Population ecology of terrestrial orchids’. (Eds TCE Wells, JH Willems) pp. 111–124. (SPB Academic Publishing: The Hague)

Dixon KW , Barrett RL (2003) Defining the role of fire in south-west Western Australian plants. In ‘Fire in ecosystems of south-west Western Australia: impacts and management’. (Eds I Abbott, N Burrows) pp. 205–223. (Backhuys Publishers: Leiden, The Netherlands)

Hill J , Carr G , Pritchard A , Govanstone A , Backhouse G (1999) Draft Recovery Plan for Mellblom’s spider–orchid Caladenia hastata (Orchidaceae: Caladeniinae) 1998–2002. Portland Aluminium and Department of Natural Resources and Environment, Melbourne.

Hollick PS, Taylor RJ, McComb JA, Dixon KW (2005) If orchid mycorrhizal fungi are so specific, how do natural hybrids cope? Selbeyana 26, 159–170.

Hopper SD (2009a) Taxonomic turmoil down-under: recent developments in Australian orchid systematics. Annals of Botany (in press). ,
| Crossref | GoogleScholarGoogle Scholar | PubMed |

Hopper SD (2009b) OCBIL theory: towards an integrated understanding of the evolution, ecology and conservation of biodiversity on old, climatically buffered, infertile landscapes. Plant and Soil (in press). ,

Hopper SD, Brown AP (2000) New genera, subgenera, combinations, and species in the Caladenia alliance (Orchidaceae: Diurideae). Lindleyana 15, 120–126.

Hopper SD, Brown AP (2001) Contributions to Western Australian Orchidology: 2. New taxa and circumscriptions in Caladenia (Spider, Fairy and Dragon Orchids of Western Australia). Nuytsia 14, 27–314.

Hopper SD, Brown AP (2004) Robert Brown’s Caladenia revisited, including a revision of its sister genera Cyanicula, Ericksonella and Pheladenia (Caladeniinae: Orchidaceae). Australian Systematic Botany 17, 171–240.
| Crossref | GoogleScholarGoogle Scholar |

Hopper SD, Gioia P (2004) The Southwest Australian Floristic Region: evolution and conservation of a global hot spot of biodiversity. Annual Review of Ecology, Evolution and Systematics 35, 623–650.
| Crossref | GoogleScholarGoogle Scholar |

Huynh TT, McLean CB, Coates F, Lawrie AC (2004) Effect of developmental stage and peloton morphology on success in isolation of mycorrhizal fungi in Caladenia formosa (Orchidaceae). Australian Journal of Botany 52, 231–241.
| Crossref | GoogleScholarGoogle Scholar |

Jones DL, Clements MA, Sharma IK, Mackenzie AM (2001) A new classification of Caladenia R.Br. (Orchidaceae). Orchadian 13, 389–419.

Kores PJ, Molvray M, Weston PH, Hopper SD, Brown AP, Cameron KM, Chase MW (2001) A phylogenetic analysis of Diurideae (Orchidaceae) based on plastid DNA sequence data. American Journal of Botany 88, 1903–1914.
| Crossref | GoogleScholarGoogle Scholar | CAS |

Lindley J (1840 a) ‘A sketch of the vegetation of the Swan River Colony.’ Appendix to the first 23 volumes of the Botanical Register.

Lindley J (1840 b) ‘The genera and species of orchidaceous plants.’ (Ridgways: London)

Mabberley D (1999) ‘Ferdinand Bauer, the Nature of Discovery.’ (Merrell Holberton Publishers and the Natural History Museum: London)

McLachlan JS, Hellman JJ, Schwartz MW (2007) A framework for debate of assisted migration in an era of climate change. Conservation Biology 21, 297–302.
| Crossref | GoogleScholarGoogle Scholar | PubMed |

Pate JS , Dixon KW (1982) ‘Tuberous, cormous and bulbous plants – biology of an adaptive strategy.’ (University of Western Australian Press: Perth)

Ramsay M , Dixon KW (2003) Propagation science, recovery and translocation of terrestrial orchids. In ‘Orchid conservation’. (Eds KW Dixon, SP Kell, RL Barrett, PJ Cribb) pp. 259–287. (Natural History Publications: Kota Kinabalu, Sabah)

Ramsay RR, Dixon KW, Sivasithamparam K (1986) Patterns of infection and endophytes associated with Western Australian orchids. Lindleyana 1, 203–214.

Reichenbach HG (1871) ‘Beitrage zur systematischen Pflanzenkunde’. (T.G. Meissner: Hamburg)

Smith JE (1805) Tab 104 Arethusa catenata. In ‘Exotic Botany: consisting of coloured figures and scientific description of such new, beautiful, or rare plants as are worthy of cultivation in the gardens of Britain; with remarks on their qualities, history, and requisite modes of treatment.’ Vol. II. pp. 89–90. (R. Taylor and Co.: London)

Swarts ND (2007) Integrated conservation of the rare and endangered terrestrial orchid Caladenia huegelii H.G. Reichb. PhD Thesis, The University of Western Australia, Perth.

Swarts N, Dixon KW (2009) Orchid conservation in the age of extinction. Annals of Botany (in press)15 February 2009). ,
| Crossref | GoogleScholarGoogle Scholar | PubMed |

White J (1790) ‘Journal of a Voyage to New South Wales with sixty-five plates of non descript animals, birds, lizards, serpents, curious cones of trees and other natural productions.’ (J. Debrett: London)