''Oxalis ortgiesii'', the fishtail oxalis, is a species of ''

Oxalis ''Oxalis'' ( (British English) or (American English)) is a large genus of flowering plants in the wood-sorrel family, Oxalidaceae, comprising over 550 species. The genus occurs throughout most of the world, except for the polar areas; species ...

'' (wood sorrel) native to Bolivia, Ecuador, and Peru. The three leaflets are deeply cleft at the tip, and purple on the underside. The yellow flowers have three stamen lengths and three pistil lengths, ordered in such a way that stamens and pistil of any one flower are never of the same length, guaranteeing cross-pollination.

References

* Gartenflora 24:1, t. 817. 1875 * Brako, L. & J. L. Zarucchi. 1993. Catalogue of the flowering plants and gymnosperms of Peru. Monogr. Syst. Bot. Missouri Bot. Gard. 45. * Jørgensen, P. M. & S. León-Yánez, eds. 1999. Catalogue of the vascular plants of Ecuador. Monogr. Syst. Bot. Missouri Bot. Gard. 75. * Liberty Hyde Bailey Hortorium. 1976. Hortus third. * Lourteig, A. 2000. Oxalis L. subgéneros Monoxalis (Small) Lourt., Oxalis y Trifidus Lourt. Bradea 7:136. * Macbride, J. F. et al., eds. 1936–1971. Flora of Peru.; new ser. 1980- ortgiesii Plants described in 1875 {{Oxalidales-stub