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The Jardin Exotique de Monaco: One of the great succulent plant gardens of the world
... These regions, including parts of South Africa's southern, western and northern Cape coastal regions, typically have mild, wet winters and hot, dry summers, a perfect climate for growing a wide range of plants. Some of the most spectacular private (Les Cedres; Smith, 1997) and institutional (Smith & Van Wyk, 1999) gardens in the world have been created in Mediterranean regions, and along with their establishment came the desire to introduce and grow plants from other parts of the world. Not surprisingly, therefore, these and adjacent mild-climate, regions have been subject to numerous exotic species escaping into the adjoining natural vegetation, and several of these have become problem plants (see for example Smith & Mössmer, 1996;Smith & Klopper, 2007;Smith & Figueiredo, 2007;Smith et al., 2008). ...
The Mexican Agave americana L. subsp. americana var. expansa (Jacobi) Gentry, a distinctive variety of the widely cultivated, blueleaved century plant, is here recorded as having become established in South Africa. A description and key that can be used to distinguish it from A. americana (subsp. americana) var. americana, which is more widely naturalized in South and southern Africa, is provided.
Agave celsii var. albicans is native to the arid Hidalgo province, Mexico. It is hereby reported from South Africa for the first time. This alien taxon is increasingly being cultivated in the southwestern Cape where it has the potential of becoming part of the naturalised alien flora. In this report the plants are described and illustrated for easy identification.
Agave americana L. var. americana and A. sisalana Perrine are here listed and described as exotic alien plants that have become naturalised in the Cape Floristic Region of South Africa. A key is provided to assist with the identification of the two species.
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