Acer 1a Lund Bot Garden 140422 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 1e Lund Bot Garden 140617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 1f Lund Bot Garden 140617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 1g Lund Bot Garden 140617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 1h Lund Bot Garden 140617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 2c Lund Bot Garden 130515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 2d Lund Bot Garden 130515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 2e Lund Bot Garden 130515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 2f Lund Bot Garden 130515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 3a Flinck's Garden, Bjuv Sk 140518 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 4a Flinck's Garden, Bjuv Sk 140518 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 4b Flinck's Garden, Bjuv Sk 140518 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 4c Flinck's Garden, Bjuv Sk 140518 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 4d Flinck's Garden, Bjuv Sk 140518 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 5b NW of Dadia, Thracia, Greece 060606 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 6 Napa Hai, Yunnan 110709 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 7a Landskrona Sk 151012 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 7b Landskrona Sk 151012 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 7c Landskrona Sk 151012 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer caesium 1 Göteborg Bot Garden 120628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer caesium 2 Göteborg Bot Garden 120628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer campestre 1 (cult) Lund Sk 110510 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer campestre 10 between Södra Lindholmen and Silversborg, Svedala Sk 140914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer campestre 11 between Södra Lindholmen and Silversborg, Svedala Sk 140914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer campestre 12 between Södra Lindholmen and Silversborg, Svedala Sk 140914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer campestre 2 (cult) Lund Sk 110510 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer campestre 3 (cult) Lund Sk 110510 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer campestre 4 (cult) Lund Sk 110510 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer campestre 5 (cult) Lund Sk 110510 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer campestre 6 (cult) Lund Sk 110510 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer campestre 7 between Södra Lindholmen and Silversborg, Svedala Sk 140914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer campestre 8 between Södra Lindholmen and Silversborg, Svedala Sk 140914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer campestre 9 between Södra Lindholmen and Silversborg, Svedala Sk 140914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer capillipes 1 Lund Bot Garden 090528 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer capillipes 2 Lund Bot Garden 140523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer capillipes 3 Lund Bot Garden 090528 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer capillipes 4 Lund Bot Garden 090528 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer capillipes 5 Lund Bot Garden 090528 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer capillipes 8 Lund Bot Garden 130528 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer capillipes 9 Lund Bot Garden 130528 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer cappadocicum 1 Liljeholmen, Stockholm 050911 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer cf cappadocicum 1 Landskrona Sk 151012 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer cf cappadocicum 2 Landskrona Sk 151012 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer circinatum 1 Blykobbe, Bornholm DK 120601 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer circinatum 2 Blykobbe, Bornholm DK 120601 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer circinatum 4 Blykobbe, Bornholm DK 120601 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer circinatum 6 Blykobbe, Bornholm DK 120601 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer circinatum 8 Blykobbe, Bornholm DK 120601 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer cissifolium 1 Lund Bot Garden 130527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer cissifolium 4 Lund Bot Garden 130527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer cissifolium 6 Lund Bot Garden 130527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer griseum 1 Lund Bot Garden 150520 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer griseum 2 Lund Bot Garden 150520 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer griseum 3 Lund Bot Garden 150520 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer griseum 4 Lund Bot Garden 150520 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer griseum 5 Lund Bot Garden 150520 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer griseum 6 Lund Bot Garden 150520 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer heldreichii 1 Mt Varnous, N Greece 180630 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer heldreichii 2 Mt Varnous, N Greece 180630 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer heldreichii 3 Mt Varnous, N Greece 180630 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer japonicum 1 Göteborg Bot Garden 130524 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer japonicum 2 Göteborg Bot Garden 130524 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer japonicum 3 Göteborg Bot Garden 130524 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer macrophyllum 1 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer macrophyllum 2 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer macrophyllum 3 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer macrophyllum Bergianska, Stockholm 020430 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer monspessulanum 1 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer monspessulanum 2 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer monspessulanum 2 Lund Bot Garden 140617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer monspessulanum 3 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer monspessulanum 3 Lund Bot Garden 140617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer monspessulanum 4 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer monspessulanum 5 Holomondas, Greece 050528 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer monspessulanum 6 Torcal de Antequera, Andalucía Spain 220418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer monspessulanum 7 Torcal de Antequera, Andalucía Spain 220418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer monspessulanum 8 Torcal de Antequera, Andalucía Spain 220418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer monspessulanum 9 Torcal de Antequera, Andalucía Spain 220418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer negundo 3 Lund Bot Garden 140617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer opalus 1 Moneval NE of Grenoble FR 150705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer opalus 2 Moneval NE of Grenoble FR 150705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer palmatum 1 Lund Bot Garden 150520 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer palmatum 2 Lund Bot Garden 150520 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer palmatum 3 Lund Bot Garden 150520 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer palmatum 5 Lund Bot Garden 150520 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer pensylvanicum Macedonia State Park, Connecticut 900606 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer platanoides 1 Lund Sk 140426 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer platanoides 2 Lund Sk 140417 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer platanoides 3 Lund Sk 140417 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer platanoides 4 Lund Sk 140417 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer platanoides 5 Lund Sk 140417 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer platanoides 6 (cult) Lund Sk 130903 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer platanoides 7 (cult) Lund Sk 130903 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer platanoides 8 Lund Sk 140417 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer platanoides 9 Lund Sk 140426 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer pseudoplatanus 11 Lund Sk 130902 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer pseudoplatanus 5 Lund Sk 130530 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer pseudoplatanus 6 Lund Sk 130530 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer pseudoplatanus 7 Lund Sk 130530 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer pseudoplatanus 9 Lund Sk 130902 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer rubrum 1 Storrs, Connecticut 900420 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer rubrum 2 Storrs, Connecticut 900528 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer tataricum 1 between Mikroderio and Metaxades, Thracia, Greece 060608 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer tataricum 10 Gärdet, Stockholm 150529 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer tataricum 11 Gärdet, Stockholm 150529 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer tataricum 12 Gärdet, Stockholm 150529 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer tataricum 16 Lund Bot Garden 150602 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer tataricum 17 Lund Bot Garden 150602 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer tataricum 2 Turda, Romania 090614 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer tataricum 3 Turda, Romania 090614 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer tataricum 9 Gärdet, Stockholm 150529 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer tegmentosum 1 (cult) Sölvesborg, Blekinge 150608 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer tegmentosum 2 (cult) Sölvesborg, Blekinge 150608 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 1b Lund Bot Garden 140422 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 1c Lund Bot Garden 140422 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 1d Lund Bot Garden 140422 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 2a Lund Bot Garden 130515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 2b Lund Bot Garden 130515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 3b Flinck's Garden, Bjuv Sk 140518 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 3c Flinck's Garden, Bjuv Sk 140518 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 3d Flinck's Garden, Bjuv Sk 140518 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 5a NW of Dadia, Thracia, Greece 060606 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer 7d Landskrona Sk 151012 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer capillipes 22 Lund Bot Garden 160628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer capillipes 23 Lund Bot Garden 160628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer capillipes 24 Lund Bot Garden 160628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer capillipes 25 Lund Bot Garden 160628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer capillipes 6 Lund Bot Garden 140523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer capillipes 7 Lund Bot Garden 140523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer cappadocicum 2 Liljeholmen, Stockholm 050911 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer circinatum 3 Blykobbe, Bornholm DK 120601 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer circinatum 5 Blykobbe, Bornholm DK 120601 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer circinatum 7 Blykobbe, Bornholm DK 120601 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer cissifolium 2 Lund Bot Garden 130527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer cissifolium 3 Lund Bot Garden 130527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer cissifolium 5 Lund Bot Garden 130527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer macrophyllum 4 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer macrophyllum 5 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer monspessulanum 1 Bergianska, Stockholm 040509 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer monspessulanum 4 Lund Bot Garden 140617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer monspessulanum 5 Lund Bot Garden 140617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer negundo 1 Lund Bot Garden 140617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer negundo 2 Lund Bot Garden 140617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer palmatum 4 Lund Bot Garden 150520 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer palmatum 6 Lund Bot Garden 150520 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer palmatum 7 Lund Bot Garden 150520 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer pseudoplatanus 1 Lund Sk 130530 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer pseudoplatanus 10 Lund Sk 130902 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer pseudoplatanus 2 Lund Bot Garden 070516 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer pseudoplatanus 3 Lund Sk 130530 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer pseudoplatanus 4 Lund Sk 130530 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer pseudoplatanus 8 Lund Sk 130530 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer spicatum 1 Cornwall, Connecticut 900606 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer spicatum 2 Cornwall, Connecticut 900606 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer tataricum 13 Lund Bot Garden 150602 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer tataricum 14 Lund Bot Garden 150602 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer tataricum 15 Lund Bot Garden 150602 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Acer tataricum 4 Turda, Romania 090614 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).