Another Beautiful Weed?

I photographed this flower from my wife's garden some time ago but didn't know what it was called. I've now found it is called Wandering Jew, but this name is considered offensive:

 

Tradescantia is more correctly known as wandering Jew in New Zealand, but as this name is considered offensive to some people, it has been decided to call it tradescantia on this site. Some in New Zealand have decided to call it wandering willie, though many organisations within this country have now moved to the name of tradescantia to get away from the offensive nature of the official name. Tradescantia is a succulent perennial plant that is an environmental weed, causing major problems under trees and in bush reserves throughout the North Island in some parts of the South Island. Originally from South America, it has been grown as an ornamental garden plant for many years and also in hanging pots, but sale in garden centres is now banned because of its invasive nature. Because tradescantia can form thick mats of vegetation in moist, shady areas within bush reserves, it stops new seedlings of trees and shrubs from establishing wherever it grows. Although it is not thought to produce seeds within New Zealand, it spreads due to the brittle nature of its stems, resulting in the plant fragmenting easily, and these fragments do not dry out easily. It probably spreads mainly during periods of flooding, when it gets washed into new areas. It also gets into new areas through people dumping garden waste on roadsides, as it is commonly found in many gardens, especially where gardens have been growing for many decades. Apart from being a major problem within bush areas and shady gardens, it can cause allergic skin reactions in dogs and other animals running through the foliage. It is also exceedingly difficult to get rid of once established. (www.massey.ac.nz/massey/learning/colleges/college-of-scie...)

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