Trillium (Paris polyphylla) Flinck's garden, Bjuv, Skåne 040803 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium (Paris quadrifolia) 1 Pålsjö, Helsingborg Sk 130601 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium (Paris quadrifolia) 2 Pålsjö, Helsingborg Sk 130601 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium (Paris quadrifolia) 3 Pålsjö, Helsingborg Sk 130601 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium (Paris quadrifolia) 4 Pålsjö, Helsingborg Sk 130813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium (Paris quadrifolia) 5 Pålsjö, Helsingborg Sk 130813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium 1a Lund Bot Garden 130523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium 1c Lund Bot Garden 130523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Trillium angustipetalum 2 Copenhagen Bot Garden 140424 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium angustipetalum 3 Copenhagen Bot Garden 140424 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

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

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

Trillium cf ovatum 1 Flinck's garden, Bjuv Sk 090506 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium cf ovatum 2 Flinck's garden, Bjuv Sk 090506 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium cf ovatum 3 Flinck's garden, Bjuv Sk 090506 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Trillium chloropetalum 3 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

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

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

Trillium erectum 4 Storrs, Connecticut 900428 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium giganteum 1 Flinck's garden, Bjuv Sk 140518 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium grandiflorum 1 Copenhagen Bot Garden 100421 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium grandiflorum 2 Bergianska, Stockholm 050531 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium grandiflorum 3 Flinck's garden, Bjuv Sk 140518 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium luteum 1 (cult) Brunnby Sk 170611 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium luteum 2 (cult) Brunnby Sk 170611 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium 1b Lund Bot Garden 130523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium 1d Lund Bot Garden 130523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium 2 Flinck's Garden, Bjuv Sk 090506 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Trillium erectum 5 Storrs, Connecticut 900428 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium giganteum 2 Flinck's garden, Bjuv Sk 140518 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium luteum 3 (cult) Brunnby Sk 170611 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium sessile 1 Copenhagen Bot Garden 140515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Trillium sessile 2 Copenhagen Bot Garden 140515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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