Wet Dandelion Seedhead

This pic was taken by my sisters when they travelled to Canada. I personally haven't seen this type of flower in Malaysia. I guess it only exist in colder areas. Appreciate any help in identifying it. Thanks!

Added 6th December 2005
Thanks to identification by SusanC.

Everybody knows this weed, and most have a love-hate relationship with it. We don't try too hard to keep it out of the lawn, but it's not welcome in our garden areas. The large fleshy taproot on established plants reaches quite deep, and must be completely removed to get rid of the plant. Several varieties grow in our gardens, some with plain leaves, others deeply cut.

Quoted from http://www.robsplants.com/plants/TaraxOffic.php