Oxalis (Salter, 1944)

Suda, Jan, Krejčíková, Jana, Sudová, Radka, Oberlander, Kenneth C. & Dreyer, Léanne L., 2013, Two new species of Oxalis (Oxalidaceae) from the Greater Cape Floristic Region, Phytotaxa 124 (1), pp. 13-24 : 23

Key to the multifoliolate species of Oxalis from the Bokkeveld Plateau, South Africa

1. Well-developed above-ground stem (exserted at least 12 mm above ground) .............................................. O. zeyheri

- Stemless or with very short above-ground stem (less than 12 mm above ground) ...................................................... 2

2. Leaflets glabrous.......................................................................................................................................................... 3

- Leaflets pubescent to hirsute ........................................................................................................................................ 5

3. Plant semi-succulent, leaflets oblong to linear-oblong, petiole fleshy to winged, sepals callose .................... O. flava

- Plant wiry to delicate, leaflets linear, conduplicate or U-shaped in cross-section, petioles filiform, sepals ecallose .... ..................................................................................................................................................................................... 4

4. Petiole base and apex distinctly swollen, petals with two swollen basal papillate swellings, filaments toothed........... .................................................................................................................................................................... O. pulvinata

- Petiole base and apex slightly swollen, petals non-papillate, filaments edentate.................................... O. filifoliolata

5. Petioles sparsely pilose, grooved, leaflets with two apical calli, sepals ecallose ...................................... O. saltusbelli

- Petioles densely pilose, terete, leaflets with multiple abaxial calli, sepals distinctly callose, recurved ...... O. carolina