but which has flowers that are much greener than those in willow weed, and are not clustered as tightly into cylindrical bunches as in willow weed. A very closely related weed is pale willow weed ...
Another oxalis species with pinkish flowers is lilac oxalis (Oxalis incarnata), but this has branched stems unlike pink shamrock and is more active in winter. Just to be very confusing, there is ...