Gomphocarpus fruticosus (swan plant; narrow-leaved cotton bush) is a species of plant native to South Africa.Clive Bromilow; Problem Plants of South Africa, Briza Publications 2001 It is also common in Australia and New Zealand where it is a host of the monarch butterfly.Multiple sources:
The plant's tissues contain sufficient cardenolides that consumption of significant quantities of the plant's leaves, stems, or fruit may lead to death in livestock and humans.Van Wyk, Van Oudshoorn & Gerike: Medicinal plants of South Africa, Briza Publications 1997. p. 36 in
The plant, also referred to as Narrow leaf cotton bush, has officially been declared a pest in Western Australia.
The species is closely related to Gomphocarpus physocarpus.
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