|Oxalis incarnata, Kelburn, Wellington|
|Oxalis incarnata leaves, Kelburn|
|Oxalis incarnata. A, flowers; B, a bulbil; C, section through a flower, enlarged.|
While many are nasty weeds, some species of Oxalis are useful. New Zealanders know the tubers of O. tuberosa as yams, but they're not true yams (yams are Dioscorea, a monocotyledon, and O. tuberosa is more correctly known as oca in its native South America). Oxalic acid is toxic, or at least irritant, but useful for cleaning up and bleaching mouldy timber. A few species are ornamentals.
Darwin, C. 1877. The different forms of flowers on plants of the same species. Murray, London.
Webb, C.J.; Sykes, W.R.; Garnock-Jones, P.J. 1988. Flora of New Zealand Vol. 4. DSIR, Christchurch.