Crassula 1 Cape of Good Hope, Western Cape, South Africa 100915 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula 2a Narrogin Foxes Lair Nature Park, Western Australia 111006 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula 2b Narrogin Foxes Lair Nature Park, Western Australia 111006 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula 2c Narrogin Foxes Lair Nature Park, Western Australia 111006 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula 3 Western Flora Caravan Park, Western Australia 110923 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula 4c W of Kulin, Western Australia 111006 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula 5a Auckland Botanical Garden 151103 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula 5b Auckland Botanical Garden 151103 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula 5c Auckland Botanical Garden 151103 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula 5d Auckland Botanical Garden 151103 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula 6a Stratford NZ 151111 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula 6b Stratford NZ 151111 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula 6c Stratford NZ 151111 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula aquatica 1 Grosshamn, Askum, Bohuslän 990717 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula aquatica 2 Grosshamn, Askum, Bohuslän 990717 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula aquatica 3 near Kalix, Norrbotten 220730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula aquatica 4 near Kalix, Norrbotten 220730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula aquatica 6 near Kalix, Norrbotten 220730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula aquatica 7 near Kalix, Norrbotten 220730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula aquatica 9 near Kalix, Norrbotten 220730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Crassula arborescens 2 S of Calitzdorp, Western Cape, South Africa 161003 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula arborescens 3 S of Calitzdorp, Western Cape, South Africa 161003 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula arborescens 4 Kirstenbosch 100906 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula arborescens 5 Kirstenbosch 100906 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula arborescens 6 Bergianska, Stockholm 070221 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula arborescens 7 Bergianska, Stockholm 070221 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula arborescens 8 Bergianska, Stockholm 070221 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf expansa 1 Rooiberg Pass SE of Ladismith, Western Cape, South Africa 161003 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf expansa 2 Rooiberg Pass SE of Ladismith, Western Cape, South Africa 161003 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf expansa 3 Rooiberg Pass SE of Ladismith, Western Cape, South Africa 161003 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf expansa 4 Robertson, Western Cape, South Africa 100926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf expansa 5 Robertson, Western Cape, South Africa 100926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf expansa 6 Robertson, Western Cape, South Africa 100926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf expansa 7 Robertson, Western Cape, South Africa 100926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf perforata 1 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf perforata 4 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf perforata 5 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf perforata 6 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Crassula cf rupestris Dept of Botany, Stockholm University 061013 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf strigosa 1 Caledon Nature Reserve, Western Cape, South Africa 100920 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf strigosa 2 Caledon Nature Reserve, Western Cape, South Africa 100920 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf vaillantii 1 Cape of Good Hope, Western Cape, South Africa 100915 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf vaillantii 2 Cape of Good Hope, Western Cape, South Africa 100915 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf vaillantii 3 Cape of Good Hope, Western Cape, South Africa 100915 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf vaillantii 4 Cape of Good Hope, Western Cape, South Africa 011021 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf vaillantii 5 Cape of Good Hope, Western Cape, South Africa 011021 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula columella 1 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula columella 2 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula columnaris 1 Minwater SW of Oudtshoorn, Western Cape, South Africa 161004 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

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

Crassula dichotoma 3 Potberg, De Hoop, Western Cape, South Africa 160930 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula falcata 1 Wellington Botanical Garden NZ 151114 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula falcata 2 Wellington Botanical Garden NZ 151114 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula fascicularis 2 Kogelberg, Western Cape, South Africa 100918 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula fascicularis 3 Olifants Bos, Cape Peninsula, Western Cape, South Africa 100915 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula fascicularis 4 Klein Blouberg, Cape Point, Western Cape, South Africa 100907 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula fascicularis 6 Klein Blouberg, Cape Point, Western Cape, South Africa 100907 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 1 Cape of Good Hope, Western Cape, South Africa 100915 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 10 E of Da Gama monument, Cape Peninsula, Western Cape, South Africa 100915 (2) - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 11 E of Da Gama monument, Cape Peninsula, Western Cape, South Africa 100915 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 12 Lladudno Beach, Cape Peninsula, Western Cape, South Africa 100930 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 13 Lladudno Beach, Cape Peninsula, Western Cape, South Africa 100930 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 14 Lladudno Beach, Cape Peninsula, Western Cape, South Africa 100930 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 15 Copenhagen Bot Garden 140719 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 16 Copenhagen Bot Garden 140719 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 17 Copenhagen Bot Garden 140719 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 2 Cape of Good Hope, Western Cape, South Africa 100915 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 3 Cape of Good Hope, Western Cape, South Africa 100915 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 4 E of Da Gama monument, Cape Peninsula, Western Cape, South Africa 100915 (2) - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 5 E of Da Gama monument, Cape Peninsula, Western Cape, South Africa 100915 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 6 E of Da Gama monument, Cape Peninsula, Western Cape, South Africa 100915 (2) - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 7 E of Da Gama monument, Cape Peninsula, Western Cape, South Africa 100915 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 8 E of Da Gama monument, Cape Peninsula, Western Cape, South Africa 100915 (2) - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 9 E of Da Gama monument, Cape Peninsula, Western Cape, South Africa 100915 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula multicava 2 (cult) Miradór de Don Martín, Güímar, Tenerife 160405 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula muscosa 1 Minwater SW of Oudtshoorn, Western Cape, South Africa 161004 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 1 Kirstenbosch 100906 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 10 Lund Bot Garden 150218 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 14 Lund Bot Garden 150218 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 15 Lund Bot Garden 150218 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 16 Lund Bot Garden 150218 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 17 Lund Bot Garden 150218 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 18 Lund Bot Garden 150218 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 8 Lund Bot Garden 150218 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 9 Lund Bot Garden 150218 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula pellucida 1 Table Mountain, Western Cape, South Africa 100929 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

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

Crassula pellucida 4 Table Mountain, Western Cape, South Africa 100929 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula perfoliata 1 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula perfoliata var minor 1 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula perfoliata var minor 2 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula perforata 1 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula perforata 2 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula rupestris 5 E of Barrydale, Western Cape, South Africa 100924 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula rupestris 8 Potberg, De Hoop, Western Cape, South Africa 160930 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula sebaeoides 1 De Hoop, Western Cape, South Africa 100921 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula sebaeoides 2 De Hoop, Western Cape, South Africa 100921 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula sebaeoides 4 Rooiberg Pass SE of Ladismith, Western Cape, South Africa 161003 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula sebaeoides 6 Rooiberg Pass SE of Ladismith, Western Cape, South Africa 161003 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula subulata 2 Robinson Pass, Western Cape, South Africa 100925 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula subulata 5 Tradouws Pass, Western Cape, South Africa 100922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

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

Crassula tillaea 3 Mirador de San Antón, Andalucía Spain 220412 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula 4a W of Kulin, Western Australia 111006 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula 4b W of Kulin, Western Australia 111006 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula aquatica 5 near Kalix, Norrbotten 220730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula aquatica 8 near Kalix, Norrbotten 220730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf multiclava 1 Kirstenbosch Bot Garden 100916 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf multiclava 2 Kirstenbosch Bot Garden 100916 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf perforata 2 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf perforata 3 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf rubricaulis 1 Swartberg Pass NW of Oudtshoorn, Western Cape, South Africa 161005 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf strigosa 3 Table Mountain, Western Cape, South Africa 100929 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula cf strigosa 4 Table Mountain, Western Cape, South Africa 100929 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula columella 3 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula expansa 2 Minwater SW of Oudtshoorn, Western Cape, South Africa 161004 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula expansa 3 Minwater SW of Oudtshoorn, Western Cape, South Africa 161004 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula expansa 4 Minwater SW of Oudtshoorn, Western Cape, South Africa 161004 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula expansa 5 Minwater SW of Oudtshoorn, Western Cape, South Africa 161004 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula fascicularis 1 Kogelberg, Western Cape, South Africa 100918 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula fascicularis 5 Klein Blouberg, Cape Point, Western Cape, South Africa 100907 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 18 Copenhagen Bot Garden 140719 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula glomerata 19 Copenhagen Bot Garden 140719 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula hemisphaerica 1 Minwater SW of Oudtshoorn, Western Cape, South Africa 161004 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula hemisphaerica 2 Minwater SW of Oudtshoorn, Western Cape, South Africa 161004 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula hemisphaerica 3 Minwater SW of Oudtshoorn, Western Cape, South Africa 161004 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula hemisphaerica 4 Minwater SW of Oudtshoorn, Western Cape, South Africa 161004 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula multicava 1 (cult) Miradór de Don Martín, Güímar, Tenerife 160405 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula muscosa 10 the road Barrydale-Ladismith, Western Cape, South Africa 100924 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula muscosa 11 Copenhagen Bot Garden 121205 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula muscosa 12 Copenhagen Bot Garden 121205 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula muscosa 13 Copenhagen Bot Garden 121205 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula muscosa 2 Minwater SW of Oudtshoorn, Western Cape, South Africa 161004 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula muscosa 3 Minwater SW of Oudtshoorn, Western Cape, South Africa 161004 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula muscosa 4 Minwater SW of Oudtshoorn, Western Cape, South Africa 161004 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula muscosa 5 Minwater SW of Oudtshoorn, Western Cape, South Africa 161004 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula muscosa 6 Minwater SW of Oudtshoorn, Western Cape, South Africa 161004 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula muscosa 7 Minwater SW of Oudtshoorn, Western Cape, South Africa 161004 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula muscosa 8 the road Barrydale-Ladismith, Western Cape, South Africa 100924 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula muscosa 9 the road Barrydale-Ladismith, Western Cape, South Africa 100924 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula nudicaulis Vanrhynspass, Western Cape, South Africa 100910 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 11 Lund Bot Garden 150218 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 12 Lund Bot Garden 150218 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 13 Lund Bot Garden 150218 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 2 Kirstenbosch 100906 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 3 Lund Bot Garden 150218 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 4 Lund Bot Garden 150218 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 5 Lund Bot Garden 150218 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 6 Lund Bot Garden 150218 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula ovata 7 Lund Bot Garden 150218 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula perfoliata 2 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula perforata 10 Copenhagen Bot Garden 160713 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula perforata 3 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula perforata 4 Copenhagen Bot Garden 140625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula perforata 5 Copenhagen Bot Garden 140625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula perforata 6 Copenhagen Bot Garden 140625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula perforata 7 Copenhagen Bot Garden 160713 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula perforata 8 Copenhagen Bot Garden 160713 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula perforata 9 Copenhagen Bot Garden 160713 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Crassula pyramidalis 2 S of Calitzdorp, Western Cape, South Africa 161003 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula pyramidalis 3 S of Calitzdorp, Western Cape, South Africa 161003 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula rupestris 1 E of Barrydale, Western Cape, South Africa 100924 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula rupestris 2 Robertson, Western Cape, South Africa 100926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula rupestris 3 Robertson, Western Cape, South Africa 100926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula rupestris 4 E of Barrydale, Western Cape, South Africa 100924 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula rupestris 6 Potberg, De Hoop, Western Cape, South Africa 160930 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula rupestris 7 Potberg, De Hoop, Western Cape, South Africa 160930 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula sebaeoides 3 Rooiberg Pass SE of Ladismith, Western Cape, South Africa 161003 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula sebaeoides 5 Rooiberg Pass SE of Ladismith, Western Cape, South Africa 161003 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula subulata 1 Robinson Pass, Western Cape, South Africa 100925 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula subulata 3 Tradouws Pass, Western Cape, South Africa 100922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula subulata 4 Tradouws Pass, Western Cape, South Africa 100922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula tillaea 1 above Seki, near Syedra, Turkey 090410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula tillaea 2 above Seki, near Syedra, Turkey 090410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula tillaea 4 Mirador de San Antón, Andalucía Spain 220412 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Crassula tillaea 5 Mirador de San Antón, Andalucía Spain 220412 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).