This has been flowering in my garden during the coldest part of the winter. It's a minute plant that has a formed a colony in a patch of moss on a concrete path. The flower stems are 25-75 mm high and emerge from a small rosette. The way the seed pods develop with the petals still attached seems distinctive but I can't identify it. Does anyone have the answer?
Maybe a Shadflower (Draba verna / Erophila verna)? Although Wikipedia does not show NZ as a part of the distribution area of Erophila verna, the NZ Plant Conservation Network's website has information, that this plant is naturalized there long time ago: Erophila verna | New Zealand Plant Conservation Network A nice photo of Draba verna * Draba verna WHITLOW-GRASS
