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Tropical African cedars (Widdringtonia, Cupressaceae): systematics, ecology and conservation status

1997; Oxford University Press; Volume: 123; Issue: 4 Linguagem: Inglês

10.1111/j.1095-8339.1997.tb01421.x

1095-8339

C. ANTON PAUW, H. P. Linder,

Botany and Plant Ecology Studies

Phenetic analyses of 24 morphological characters, collected in the field for 150 trees of Widdringtonia in Malawi, Zimbabwe, Mozambique and northern South Africa, show two distinct clusters. One can be identified as W. whytei, a tall, wide-crowned forest tree endemic to Mt Mulanje in Malawi, while the other is W. nodiflora, a multi-stemmed shrub or narrow-crowned tree, which is common on Mulanje and widespread in southern Africa. These two sympatric species are distinct on phenetic, phylogenetic, ecological and biological grounds. The distinguishing characters of the two species are analysed and discussed and the differences are related to different responses to fire. Widdringtonia whytei is a forest pioneer with limited fire survival ability, while W. nodiflora coppices after fire and is common in fire-prone heathlands. To date it has been assumed that there is a single species of Widdringtonia on Mt Mulanje, and this has led to faulty management and exploitation decisions. Extensive plantations of the economically useless W. nodiflora have been established, in the belief that they are the economically desirable Mulanje cedar, W. whytei, which is now in danger of extinction.