This North American introduction looks quite like other yellow sorrels such as Oxalis corniculata (Yellow-sorrel) in that it has yellow flowers, green but often brownish leaves and upright, explosive seed pods. The biggest difference between these two in my experience is that O. stricta is as its name suggests upright but O. corniculata is a largely procumbent plant.
Although it is a troublesome weed and like many of this genus difficult to eradicate from your garden, it is edible and the leaves, flowers and even the unripe seed pods are edible sources of vitamin C.
Redbrook village, Gloucestershire 6th September 2005
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Added on September 17th 2005