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A small, undistinguished perennial, 40 cm (16 in) high, it has a basal rosette of ovate leaves and cylindrical spikes...

A perennial climber, growing to 6 m (20 ft.), with a strong, woody stem and ovate, prominently-veined, dark-green leaves. It...

A large, frost-hardy perennial, 90 cm-1.5 m (3-5 ft.) tall, with smooth, hollow, purplish stems and ovate to lance late...

An aromatic, dioecious, evergreen tree growing to 6-7 m (19-23 ft.), it is the sole species of its genus. It...

A half-hardy annual with broadly ovate, deeply-veined leaves, reddish stems and small spikes of white flowers in summer. There are...

A hardy perennial, climbing plant on a woody stem, to 8 m (26 ft.), it clings to its support with...

A hardy annual, up to 1.5 m (5 ft.) tall, it has oblong, deeply lobed, blue-green leaves. Large, lilac, pink...

A hardy biennial, growing on a strong taproot, the spiny, toothed, dark-green leaves have a striking cobweb-effect pattern of white...

An evergreen tree, 9-12 m (29-40 ft.) tall, it has pale-grey bark and pendulous branches, with smooth, leathery, grey-green, lance...

An erect biennial, up to 1.5m (5 ft.) tall, with a thick, yellowish taproot and a rosette of basal leaves...