Melon of many names, "cucumis myriocarpus", the gooseberry cucumber, gooseberry gourd, paddy melon, Mallee Pear or prickly paddy melon is a herb native to tropical and southern Africa. While this melon looks very much like melons we see in our fruit stores with round, yellow-green or green-striped fruit, both the fruit and foliage are highly toxic due to the presence of cucurbitacin. The plant is potentially toxic to livestock and there are records of poisoning in humans.

The melon has become a noxious weed in Australia and in California, where another name - bitter apple - can be added.

If broken apart, they have an unpleasant odor which, fortunately, makes them less palatable to livestock.

More Info: en.wikipedia.org