Helianthemum 1a Ronda, Andalusia SP 120320 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum 1b Ronda, Andalusia SP 120320 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum 2 SE of Mijas, Andalusia SP 120327 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum almeriense 1 Venta de Yesos, Sorbas gypsum karst, Andalucía Spain 220415 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum almeriense 10 Venta de Yesos, Sorbas gypsum karst, Andalucía Spain 220415 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum almeriense 2 Venta de Yesos, Sorbas gypsum karst, Andalucía Spain 220415 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum almeriense 3 Venta de Yesos, Sorbas gypsum karst, Andalucía Spain 220415 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum almeriense 4 Venta de Yesos, Sorbas gypsum karst, Andalucía Spain 220415 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum almeriense 5 Venta de Yesos, Sorbas gypsum karst, Andalucía Spain 220415 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum almeriense 7 Venta de Yesos, Sorbas gypsum karst, Andalucía Spain 220415 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum almeriense 9 Venta de Yesos, Sorbas gypsum karst, Andalucía Spain 220415 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum alpestre 1 Stubnerkogel, Austria 080702 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 1 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 10 Belchite area, NE Spain 180523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 11 Belchite area, NE Spain 180523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 12 Belchite area, NE Spain 180523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 13 Belchite area, NE Spain 180523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 14 Belchite area, NE Spain 180523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 15 Belchite area, NE Spain 180523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 16 Belchite area, NE Spain 180523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 18 Belchite area, NE Spain 180523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 19 Belchite area, NE Spain 180523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 2 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 20 Bjerge, N Spain 180527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 21 Bjerge, N Spain 180527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 3 Copenhagen Bot Garden 080710 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 4 Hoces del Rio Duratón near Sepúlveda SP 140504 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 5 Hoces del Rio Duratón near Sepúlveda SP 140504 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum ssp suffruticosum 1 Cantarriján beach near Málaga, Andalucía Spain 220410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum ssp suffruticosum 2 Cantarriján beach near Málaga, Andalucía Spain 220410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum ssp suffruticosum 3 Cantarriján beach near Málaga, Andalucía Spain 220410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum ssp suffruticosum 4 Cantarriján beach near Málaga, Andalucía Spain 220410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum canariense 1 Cueva de Cuatro Puertas, Gran Canaria 080409 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum canariense 2 Cueva de Cuatro Puertas, Gran Canaria 080409 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum canariense 4 Cueva de Cuatro Puertas, Gran Canaria 080409 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum canariense 5 Cueva de Cuatro Puertas, Gran Canaria 080409 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum caput-felis 1 Jardín Botanico, Soller, Mallorca 110419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum caput-felis 2 Jardín Botanico, Soller, Mallorca 110419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum caput-felis 3 Jardín Botanico, Soller, Mallorca 110419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum caput-felis 4 Jardín Botanico, Soller, Mallorca 110419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum caput-felis 6 Jardín Botanico, Soller, Mallorca 110419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum caput-felis 7 Jardín Botanico, Soller, Mallorca 110419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum caput-felis 8 Jardín Botanico, Soller, Mallorca 110419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum caput-felis 9 Jardín Botanico, Soller, Mallorca 110419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum cf canariense 1 National Park of Souss-Massa, Morocco 140217 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum cf canariense 2 National Park of Souss-Massa, Morocco 140217 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum cf canariense 3 National Park of Souss-Massa, Morocco 140217 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum cf canariense 4 National Park of Souss-Massa, Morocco 140217 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum cinereum 3 Ojén, Andalusia SP 120319 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum cinereum 4 Sierras de Tejeda, Almijara y Alhama Natural Park, Andalucía Spain 220417 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum cinereum 5 Sierras de Tejeda, Almijara y Alhama Natural Park, Andalucía Spain 220417 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum cinereum 6 Sierras de Tejeda, Almijara y Alhama Natural Park, Andalucía Spain 220417 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum cinereum 7 Sierras de Tejeda, Almijara y Alhama Natural Park, Andalucía Spain 220417 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum cinereum 8 Sierras de Tejeda, Almijara y Alhama Natural Park, Andalucía Spain 220417 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum cinereum 9 Sierras de Tejeda, Almijara y Alhama Natural Park, Andalucía Spain 220417 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum juliae (cult) Visitor's Centre, Tenerife 090516 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum marifolium 1 Sierra Blanca de Marbella, Andalucía Spain 220414 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum marifolium 10 Sierra de Mijas, Andalucía Spain 220414 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum marifolium 13 Sierra de Mijas, Andalucía Spain 220414 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum marifolium 2 Sierra de las Nieves, Andalucía Spain 220409 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum marifolium 3 Sierra de las Nieves, Andalucía Spain 220409 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum marifolium 4 Sierra de las Nieves, Andalucía Spain 220409 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum marifolium 5 Sierra de las Nieves, Andalucía Spain 220409 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum marifolium 7 Sierra de Mijas, Andalucía Spain 220414 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum marifolium 8 Sierra de Mijas, Andalucía Spain 220414 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum marifolium 9 Sierra de Mijas, Andalucía Spain 220414 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum nummularium 1 Lund Bot Garden 130619 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum nummularium 2 Lund Bot Garden 130619 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum nummularium 3 (cult) Höllviken Sk 100625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum nummularium 4 (cult) Höllviken Sk 100625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum nummularium 5 near Lake Mikri Prespa, N Greece 180629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum nummularium 6 near Lake Mikri Prespa, N Greece 180629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum nummularium ssp grandiflorum 3 Copenhagen Bot Garden 130604 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum nummularium ssp obscurum 2 Copenhagen Bot Garden 130611 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp canescens E of Grönhögen, Ventlinge, Öland 760819 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp oelandicum 1 Tingstena, Södra Möckleby, Öland 080607 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp oelandicum 2 Tingstena, Södra Möckleby, Öland 080607 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp oelandicum 3 Tingstena, Södra Möckleby, Öland 080607 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp oelandicum 5 Tingstena, Södra Möckleby, Öland 080607 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp oelandicum 6 Kvinnsgröta, Gräsgård, Öland 150606 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp oelandicum 7 Kvinnsgröta, Gräsgård, Öland 150606 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp piloselloides 1 Burren Nat Park, Clare, Ireland 170528 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp piloselloides 10 Hoces del Rio Duratón near Sepúlveda SP 140504 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp piloselloides 11 Hoces del Rio Duratón near Sepúlveda SP 140504 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp piloselloides 12 Hoces del Rio Duratón near Sepúlveda SP 140504 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp piloselloides 13 Hoces del Rio Duratón near Sepúlveda SP 140504 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp piloselloides 2 Burren Nat Park, Clare, Ireland 170528 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp piloselloides 3 Burren Nat Park, Clare, Ireland 170528 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp piloselloides 4 Burren Nat Park, Clare, Ireland 170528 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp piloselloides 5 Burren Nat Park, Clare, Ireland 170528 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp piloselloides 6 Burren Nat Park, Clare, Ireland 170528 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp piloselloides 7 Burren Nat Park, Clare, Ireland 170528 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp piloselloides 8 Hoces del Rio Duratón near Sepúlveda SP 140504 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp piloselloides 9 Hoces del Rio Duratón near Sepúlveda SP 140504 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum salicifolium 1 NE Spili, Crete 110327 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum salicifolium 2 NE Spili, Crete 110327 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum salicifolium 3 Sierra Blanca de Marbella, Andalucía Spain 220414 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum salicifolium 4 Sierra Blanca de Marbella, Andalucía Spain 220414 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum salicifolium 7 Sierra Blanca de Marbella, Andalucía Spain 220414 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum salicifolium 8 Sierra Blanca de Marbella, Andalucía Spain 220414 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum scoparium 1 Torrey Pines, San Diego, CA 130418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum scoparium 3 Torrey Pines, San Diego, CA 130418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum scoparium 4 Torrey Pines, San Diego, CA 130418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum scoparium 5 Torrey Pines, San Diego, CA 130418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum scoparium 6 Torrey Pines, San Diego, CA 130418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum scoparium 7 Torrey Pines, San Diego, CA 130418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum syriacum 1 Cantales de la Araña, Andalucía Spain 220412 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum syriacum 2 Cantales de la Araña, Andalucía Spain 220412 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum syriacum 3 Cantales de la Araña, Andalucía Spain 220412 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum syriacum 4 Cantales de la Araña, Andalucía Spain 220412 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum syriacum 5 Cantales de la Araña, Andalucía Spain 220412 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum almeriense 6 Venta de Yesos, Sorbas gypsum karst, Andalucía Spain 220415 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum almeriense 8 Venta de Yesos, Sorbas gypsum karst, Andalucía Spain 220415 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum alpestre 2 Stubnerkogel, Austria 080702 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum alpestre 3 Stubnerkogel, Austria 080702 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 17 Belchite area, NE Spain 180523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 6 Hoces del Rio Duratón near Sepúlveda SP 140504 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 7 Hoces del Rio Duratón near Sepúlveda SP 140504 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 8 Hoces del Rio Duratón near Sepúlveda SP 140504 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum apenninum 9 Le Fontenil N of Briancon FR 150709 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum broussonetii 1 Los Tilos, La Palma 090428 (Richard Åkesson) - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum broussonetii 2 Los Tilos, La Palma 090428 (Richard Åkesson) - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum canadense Storrs, Connecticut 900602 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum canariense 3 Cueva de Cuatro Puertas, Gran Canaria 080409 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum cinereum 1 Ojén, Andalusia SP 120319 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum cinereum 2 Ojén, Andalusia SP 120319 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum marifolium 11 Sierra de Mijas, Andalucía Spain 220414 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum marifolium 12 Sierra de Mijas, Andalucía Spain 220414 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum marifolium 6 Sierra de las Nieves, Andalucía Spain 220409 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum nummularium 7 near Lake Mikri Prespa, N Greece 180629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum nummularium ssp grandiflorum 1 Copenhagen Bot Garden 130604 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum nummularium ssp grandiflorum 2 Copenhagen Bot Garden 130604 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum nummularium ssp obscurum 1 Copenhagen Bot Garden 130611 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum oelandicum ssp oelandicum 4 Tingstena, Södra Möckleby, Öland 080607 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum salicifolium 5 Sierra Blanca de Marbella, Andalucía Spain 220414 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum salicifolium 6 Sierra Blanca de Marbella, Andalucía Spain 220414 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthemum scoparium 2 Torrey Pines, San Diego, CA 130418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).