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    Endangered fairies: Two new species of caladenia (orchidaceae; orchidoideae; diurideae), from the bauxite plateaux of southwestern Western Australia

    Access Status
    Fulltext not available
    Authors
    Dixon, Kingsley
    Christenhusz, Maarten
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Dixon, K. and Christenhusz, M. 2018. Endangered fairies: Two new species of caladenia (orchidaceae; orchidoideae; diurideae), from the bauxite plateaux of southwestern Western Australia. Phytotaxa. 334 (1): pp. 87-90.
    Source Title
    Phytotaxa
    DOI
    10.11646/phytotaxa.334.1.15
    ISSN
    1179-3155
    School
    School of Molecular and Life Sciences (MLS)
    URI
    http://hdl.handle.net/20.500.11937/66320
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Magnolia Press. Two new sympatric species of Caladenia from relatively inaccessible, high lateritic plateaux in a high rainfall area in southwestern Western Australia are described here as new to science. The species occur in a restricted area, c 100 km southeast of Perth, south of Dwellingup and northeast of Waroona. The two species co-occur and are associated with putative floral model species that they are mimicking. Caladenia lateritica mimics Conostylis setosa (Haemodoraceae) in terms of flowering time, height, colour and fragrance. Caladenia rosea mimics the flowers of Hypocalymma robustum (Myrtaceae) in terms of flowering time, colour and scent. We assume that these orchids share a pollinator with their mimics and attract the pollinator via food deception as the ‘hosts’ are sources of nectar and pollen for visiting native bees. Because the species co-occur and exhibit a remarkable evolutionary ‘arms race’, they would make an ideal model for further study of the processes driving sympatric speciation. Unfortunately, both new species are under threat from mining activities and poorly informed burning regimes.

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