Botanic Gardens Trust, Sydney, Australia

 

Project Camellia

Wild Camellias of Indochina

Dr George Orel (Research Associate), Dr Adam Marchant (Senior Technical Officer) and Anthony Curry (TAFE Richmond)

The Camellia is well-known as a garden ornamental, but the domestic familiarity of this plant has the danger of obscuring the great significance of this genus for biodiversity and conservation, and of the fascinating questions to be addressed concerning its evolutionary affinities and biogeographical history. The species most familiar in Australia, are C. japonica and C. sasanqua, of which hundreds of ornamental varieties have been developed over centuries of domestication. Even more familiar is C. sinensis, which produces tea. Another species of major economic importance is C. oleifera, which is an edible oil seed crop in China.

The natural range of genus Camellia is in east Asia, from Korea and Japan in the north, to Indochina in the south, and Tibet in the east. The genus may contain up to about three hundred species, although authorities differ greatly in their estimates, and recognition of specific distinctions. Many of the species are very localised and rare in their natural habitats, and are seldom brought into cultivation. Very few of them are known outside of their native country, and there are probably many species that remain to be discovered and botanically described. The centre of diversity of Camellia appears to be in northern Indochina - so, they are primarily tropical species, despite their most familiar members being from the temperate regions.

Our project is investigating the diversity, distribution, and inter-relationships of Camellia species, with a particular focus on the relatively unexplored south-east Asian region. We are investigating such questions as the geographical origins of the genus Camellia, and attempting to unravel its sub-generic phylogenetic relationships. Numerous expeditions to the region, over the past decade, have amassed a living collection of 120 species, and over 1000 specimens for botanical examination and molecular genetic analysis. Several new species descriptions have been published, and more are in preparation.

As well as the ex situ conservation contribution of our living collections (maintained in Australia as well as Vietnam), we are endeavouring to raise awareness of the vulnerability of species in their native situation. Camellias are forest understory trees, and, as such, are threatened wherever the forests in which they live are threatened. As well as being eradicated by deforestation for agriculture, recreation (golf courses), or settlement, wild Camellias are incidentally destroyed in timber-cutting operations, and opening access into forests for this or other purposes leads to Camellia trees being cut down for fire-wood for domestic cooking.

Conservation activists know that efforts to save a well-known, iconic, species - which can generate strong public and official support - have the 'incidental' bonus of helping to preserve their habitats, ecosystems, and the many other species in them which may be less marketable, but are equally deserving and in need of protection. Camellias are widely known and loved as ornamental plants world-wide. Well publicised research on newly-discovered, rare, and threatened Camellia species in south-east Asia, together with encouragement at local and international levels for the conservation of these beautiful plants, will be a contribution to the efforts to try to save natural habitat in one of the world’s major centres of biodiversity.

Participants

  • George Orel (research associate)
  • Anthony Curry (TAFE Richmond)
  • Adam Marchant, Peter G. Wilson (Royal Botanic Gardens & Domain Trust)
  • Robert Cherry (Paradise Plants)
  • Clifford Parks (Professor Emeritus of Biology, the University of North Carolina, the USA)
  • Prof. Gao Ji-Yin (Research Institute of Subtropical Forestry, Fujang, The Chinese Academy of Forestry, P.R. China)
  • Prof. Laurent Legendre (Directeur du Laboratoire de Biotechnologies Végétales appliquées aux Plantes Aromatiques et Médicinales, Université Jean Monnet, Saint-Etienne, France)

C.-dongnaiensis
C. dongnaiensis Orel - The first Camellia species to be found and described by Australian scientists. Also, the first yellow Camellia found in south Vietnam. Highly endangered, very rare, with huge 300 mm leaves. Fully tropical, it grows in the rainforest understorey in semi-darkness.

C.-azalea
C. azalea C. F. Wei - A multipetalled form (more than the usual 5 petals, in a single whorl) from Yunnan; a fully tropical species that flowers 12 months a year. There are only about 1000 plants left in the wild. R. Cherry and G. Orel were the first non-Chinese to visit the C. azalea site.

C.-amplexicaulis
C. amplexicaulis (Pitard) Cohen Stuart - Only in cultivation, no wild population known. The white coloured petal margins fade with time. The pigmentation is not stable and does not occur on all C. amplexicaulis plants. Photos: George Orel.

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