Haleakalâ silversword (Argyroxiphium sandwicense macrocephalum) ('âhinahina ("very gray") in Hawaiian). This plant only grows in the volcano crater on the island of Maui, Hawaii, USA. It only blooms once after years growth & then it dies
Echium wildpretii is a species of flowering plant in the family Boraginaceae. It is an herbaceous biennial plant that grows up to 3 m ft) in height. The species is endemic to the island of Tenerife, and is found mainly in Las Cañadas del Teide.
Echium simplex (Tower of jewels) a herbaceous biennial plant. Native to the island of Tenerife mainly in Macizo de Anaga (Canary Islands). It is very attractive to bees and produces a distinctively flavoured honey