References

Carine, M A, Francisco-Ortega, J, Santos-Guerra, A, and Russell. S J, (2004). Relationships of island and continental floras: molecular evidence for multiple colonisations into Macaronesia and subsequent back-colonisation of the continent in Convolvulus L. American Journal of Botany 91: 1070-1085.

Holm, L, Plunknett, D.L, Pancho, J.V,  Herberger, J.P, (1977). The Worlds Worst Weeds: Distribution and Biology. University Press of Hawaii, Honolulu.

IUCN (2001) IUCN Red list Categories and Criteria: Version 3.1 IUCN Species Survival Commission, Gland, Switzerland and Cambridge, UK.

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