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They may not be able to run away as a defence from predators, but plants have developed poisons as their weapon.
An Australian vine native to higher-rainfall coastal areas, the gidee-gidee houses a toxin in its seeds that indeed causes giddiness, amongst other symptoms including diarrhoea, vomiting, disorientation and even death. Other common names, including crab's eye or rosary pea, come from the bright red and black shiny seeds, visible when the dark grey fruit pod splits open.
Its perennial nature and centimetre-wide pink, white or purple pea flowers suit it to ornamental gardens, but it is most common as a weed on roadsides and waterways. Native to north-eastern Australia, it is becoming increasingly naturalised in sub-tropical NSW, growing over supporting vegetation to up to ten metres tall.
Broken seeds are toxic when ingested, with one seed containing enough poison to kill an adult. If the seed remains intact, however, the toxin may not be released.