ふきのとう Petasites japonicus - Pick at this stage April 21 2009, 1:09pm via flickr.com

nisekoguide posted a photo:

Petasites japonicus, (Japanese: 菜蕗) also known as Fuki, bog rhubarb, or giant butterbur, is an herbaceous perennial plant in the family Asteraceae. It is native to Japan, where the spring growth is relished as a vegetable.