Tribulus L. (Zygophyllaceae)

Tribulus cistoides 1 National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Tribulus cistoides 2 National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Tribulus terrestris 1 Lund Bot Garden 130627 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Tribulus terrestris 2 Lund Bot Garden 130627 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Tribulus terrestris 3 Lund Bot Garden 130627 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Tribulus terrestris 4 Hanging Gardens, Oman 161104 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Tribulus terrestris 5 Hanging Gardens, Oman 161104 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Tribulus terrestris 6 Hanging Gardens, Oman 161104 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Tribulus terrestris 7 Hanging Gardens, Oman 161104 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Tribulus terrestris 8 Drama, N Greece 180704 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Tribulus terrestris 9 Drama, N Greece 180704 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).