Houstonia caerulea 1 Storrs, Connecticut 900415 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Houstonia caerulea 2 Storrs, Connecticut 900415 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Houstonia caerulea 3 Storrs, Connecticut 900415 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Houstonia caerulea 4 Storrs, Connecticut 900415 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Houstonia caerulea 5 (cult) Lund Sk 080511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Houstonia caerulea 6 (cult) Lund Sk 080511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Houstonia caerulea 7 (cult) Lund Sk 080511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).