Oxalis 10a Rio Clarillo Nat Park, Chile 171104 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 11a Cerro de la Cruz, Zapallar, Chile 171105 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 11b Cerro de la Cruz, Zapallar, Chile 171105 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 1a Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 1b Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 1b Copenhagen Bot Garden 140424 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 1d Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 1e Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 2a Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 2a Potberg, De Hoop, Western Cape, South Africa 160930 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 2b Potberg, De Hoop, Western Cape, South Africa 160930 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 3a Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 3b Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 3c Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 4b Copenhagen Bot Garden 140424 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 5a Grootvadersbos, Western Cape, South Africa 100922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 6 near Ceres, Western Cape, South Africa 011019 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 7a Auckland Botanical Garden 151103 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis acetosella 1 SW of Ljungbyhed, Skåne 140420 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis acetosella 10 Lövestad Sk 150424 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis acetosella 11 Lövestad Sk 150424 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis acetosella 2 Pålsjö, Helsingborg Sk 140408 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis acetosella 3 Pålsjö, Helsingborg Sk 140408 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis acetosella 4 Pålsjö, Helsingborg Sk 140408 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis acetosella 5 Pålsjö, Helsingborg Sk 140408 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis acetosella 6 Pålsjö, Helsingborg Sk 140408 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis adenophylla 1 (cult) Lund Sk 150423 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis adenophylla 2 (cult) Lund Sk 150423 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis adenophylla 3 (cult) Lund Sk 150423 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis adenophylla 5 (cult) Lund Sk 150423 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis arenaria 1 Tiger Creek, Zapallar, Chile 171105 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis articulata 3 (cult) Stångby Sk 200617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis articulata 4 (cult) Stångby Sk 200617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf algoensis 2 Swartberg Pass NW of Oudtshoorn, Western Cape, South Africa 161005 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf algoensis 3 Swartberg Pass NW of Oudtshoorn, Western Cape, South Africa 161005 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf algoensis 4 Swartberg Pass NW of Oudtshoorn, Western Cape, South Africa 161005 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf debilis 1 Tiger Creek, Zapallar, Chile 171105 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf debilis 2 Tiger Creek, Zapallar, Chile 171105 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf fergusoniae 2 Potberg, De Hoop, Western Cape, South Africa 160930 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf glabra 2 De Hoop, Western Cape, South Africa 160930 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf glabra 3 near Ceres, Western Cape, South Africa 011019 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf obtusa Bontebok National Park, Swellendam, Western Cape, South Africa 161001 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf pardalis 1 Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf perdicaria 1 Res. Nac. Yerba Loca E of Santiago, Chile 171109 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf perdicaria 2 Res. Nac. Yerba Loca E of Santiago, Chile 171109 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf perdicaria 3 Res. Nac. Yerba Loca E of Santiago, Chile 171109 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf perdicaria 4 Res. Nac. Yerba Loca E of Santiago, Chile 171109 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf perdicaria 5 Res. Nac. Yerba Loca E of Santiago, Chile 171109 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf perdicaria 6 Rio Clarillo Nat Park, Chile 171104 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf perdicaria 7 Rio Clarillo Nat Park, Chile 171104 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf perdicaria 8 Rio Clarillo Nat Park, Chile 171104 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf polyphylla 1 Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf polyphylla 2 Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf polyphylla 4 Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf polyphylla 5 Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf purpurea 1 road 303 N Ceres, Western Cape, South Africa 100914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf purpurea 2 road 303 N Ceres, Western Cape, South Africa 100914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf purpurea 4 road 303 N Ceres, Western Cape, South Africa 100914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf purpurea 5 road 303 N Ceres, Western Cape, South Africa 100914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf purpurea 6 Table Mountain, Western Cape, South Africa 100929 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf purpurea 8 Table Mountain, Western Cape, South Africa 100929 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf recticaulis 1 Grootvadersbos, Western Cape, South Africa 100922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf valdiviensis 1 Cerro de la Cruz, Zapallar, Chile 171105 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf valdiviensis 2 Cerro de la Cruz, Zapallar, Chile 171105 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf valdiviensis 3 Cerro de la Cruz, Zapallar, Chile 171105 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis convexula 1 Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis convexula 2 Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis corniculata 1 Copenhagen Bot Garden 130913 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis corniculata 2 Copenhagen Bot Garden 130913 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis corniculata 3 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis dillenii 1 Lund Bot Garden 100608 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis dillenii 2 Lund Sk 110629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis dillenii 3 Lund Sk 110629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis dillenii 6 Höllviken Sk 080620 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis dillenii 7 Höllviken Sk 080620 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis eckloniana 1 Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis eckloniana 2 Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis eckloniana 3 Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis eckloniana Dept of Botany, Stockholm University 041029 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis enneaphylla 1 Copenhagen Bot Garden 080513 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis enneaphylla 2 Copenhagen Bot Garden 080513 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis enneaphylla 3 Copenhagen Bot Garden 080513 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis exilis 1 Wattle Bay, Auckland NZ 151104 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis exilis 3 Wattle Bay, Auckland NZ 151104 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis fontana 1 Helsingborg Sk 130601 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis fontana 2 Helsingborg Sk 130601 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis fontana 3 Helsingborg Sk 130601 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis glabra 2 Dept of Botany, Stockholm University 031113 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis leucolepis 1 Napa Hai, Yunnan 110709 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis leucolepis 2 Napa Hai, Yunnan 110709 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis leucolepis 3 Napa Hai, Yunnan 110709 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis leucolepis 4 Napa Hai, Yunnan 110709 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis leucolepis 5 Napa Hai, Yunnan 110709 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis luteola 1 Dept of Botany, Stockholm University 041203 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis luteola 2 Dept of Botany, Stockholm University 061013 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis luteola 3 Dept of Botany, Stockholm University 061013 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis magellanica 3 Taranaki (Mt Egmont) NZ 151111 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis obtusa 2 Contreberg Wild Flower Reserve, Western Cape, South Africa 100908 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis obtusa 3 Contreberg Wild Flower Reserve, Western Cape, South Africa 100908 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis oregana 1 Dept of Botany, Stockholm University 060221 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis oregana 2 Dept of Botany, Stockholm University 060221 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis ortgiesii 2 Lund Bot Garden 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis ortgiesii 3 Lund Bot Garden 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis ortgiesii 4 Lund Bot Garden 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis ortgiesii 6 Lund Bot Garden 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis ortgiesii 7 Lund Bot Garden 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis ortgiesii 8 Lund Bot Garden 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis pes-caprae 1 Gibraltar GB 120321 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis pes-caprae 2 Table Mountain, Western Cape, South Africa 100929 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis pes-caprae 3 Table Mountain, Western Cape, South Africa 100929 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis pes-caprae 4 Agkouseliana, Crete 110329 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis polyphylla Dept of Botany, Stockholm University 031113 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis purpurea 1 Contreberg Wild Flower Reserve, Western Cape, South Africa 100908 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis purpurea 2 Contreberg Wild Flower Reserve, Western Cape, South Africa 100908 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis regnellii Dept of Botany, Stockholm University 060221 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis spiralis ssp vulcanicola 1 Lund Bot Garden 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis spiralis ssp vulcanicola 2 Lund Bot Garden 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis spiralis ssp vulcanicola 3 Lund Bot Garden 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis squamata 1 Lund Bot Garden 130627 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis squamata 2 Lund Bot Garden 130627 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis squamata 3 Lund Bot Garden 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis squamata 4 Lund Bot Garden 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis squamata 5 Lund Bot Garden 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis succulenta 1 Dept of Botany, Stockholm University 020419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis succulenta 2 Dept of Botany, Stockholm University 020419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis valdiviensis 2 Lund Bot Garden 070620 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis valdiviensis 3 Copenhagen Bot Garden 140719 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis valdiviensis 4 Copenhagen Bot Garden 140719 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis versicolor 1 Tinie Versveld, Darling, Western Cape, South Africa 100908 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 1a Copenhagen Bot Garden 140424 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 1c Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 1c Copenhagen Bot Garden 140424 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 2b Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 2c Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 3d Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 4a Copenhagen Bot Garden 140424 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 4c Copenhagen Bot Garden 140424 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 5b Grootvadersbos, Western Cape, South Africa 100922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis 7b Auckland Botanical Garden 151103 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis acetosella 7 Pålsjö, Helsingborg Sk 130813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis acetosella 8 Pålsjö, Helsingborg Sk 130813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis acetosella 9 Lövestad Sk 150424 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis adenophylla 4 (cult) Lund Sk 150423 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis arenaria 2 Tiger Creek, Zapallar, Chile 171105 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis articulata 1 (cult) Stångby Sk 200617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis articulata 2 (cult) Stångby Sk 200617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf algoensis 1 S of Calitzdorp, Western Cape, South Africa 161003 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf algoensis 5 Swartberg Pass NW of Oudtshoorn, Western Cape, South Africa 161005 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf fergusoniae 1 Potberg, De Hoop, Western Cape, South Africa 160930 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf glabra 1 De Hoop, Western Cape, South Africa 160930 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf pardalis 2 Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf pardalis 3 Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf polyphylla 3 Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf purpurea 3 road 303 N of Ceres, Western Cape, South Africa 100914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf purpurea 7 Table Mountain, Western Cape, South Africa 100929 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf recticaulis 2 Grootvadersbos, Western Cape, South Africa 100922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf rosea 1 Res. Nac. Rio de los Cipreses E of Rancagua, Chile 171111 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf rosea 2 Res. Nac. Rio de los Cipreses E of Rancagua, Chile 171111 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis cf rosea 3 Res. Nac. Rio de los Cipreses E of Rancagua, Chile 171111 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis convexula 3 Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis corniculata 4 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis corniculata 5 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis dillenii 4 Lund Sk 120525 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis dillenii 5 Lund Sk 120525 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis eckloniana 4 Bergianska, Stockholm 131128 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis exilis 2 Wattle Bay, Auckland NZ 151104 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis fontana 4 Brunnby Sk 060801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis fontana 5 Flinck's Garden, Bjuv, Skåne 040803 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis glabra 1 Dept of Botany, Stockholm University 031113 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis gracilis Dept of Botany, Stockholm University 050504 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis magellanica 1 Taranaki (Mt Egmont) NZ 151111 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis magellanica 2 Taranaki (Mt Egmont) NZ 151111 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis obtusa 1 Contreberg Wild Flower Reserve, Western Cape, South Africa 100908 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis ortgiesii 1 Lund Bot Garden 090722 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis ortgiesii 5 Lund Bot Garden 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis pes-caprae 5 Agkouseliana, Crete 110329 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis valdiviensis 1 Lund Bot Garden 070620 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis valdiviensis 5 Copenhagen Bot Garden 140719 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis valdiviensis 6 Copenhagen Bot Garden 140719 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis valdiviensis 7 Copenhagen Bot Garden 140719 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis valdiviensis 8 Copenhagen Bot Garden 140719 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis versicolor 2 Tinie Versveld, Darling, Western Cape, South Africa 100908 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oxalis versicolor 3 Tinie Versveld, Darling, Western Cape, South Africa 100908 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).