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"Echium gentianoides is rare, being confined to La Palma in the Canary Islands, and classified by the International Union for Conservation of Nature as vulnerable due to browsing and predation by goats and other invasive species," says Dr Paul P Smith, Secretary General, Botanic Gardens Conservation International.

The result is a combination of plants that provide structure and texture, and flowers such as euphorbia, echium, helichrysum and agapanthus.

Frank Forcella, a research agronomist with the agency, says echium could bring more money per acre than corn.

Echium, in Borraginaceæ, 367 Ovary not lobed; pod many-seeded.

Deductions still more absurd, if possible, are recorded: thus saxifrage, and other plants that grow in rocky places, embodied as if it were in calcareous beds, were advised to dissolve the stone; and the echium, bearing some faint resemblance to a viper, was deemed infallible in the sting inflicted by this reptile.