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A hardy, clump-forming perennial, 30-90 cm (1-3 ft.) tall, it grows on a creeping rootstock, with pinnate leaves divided into...

A hardy perennial with a creeping rhizome, and usually branched stems, it is 30-45 cm (12-18 in) tall. The large...

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...

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 perennial, 70-80 cm (28-31 in) tall, it usually has a forked root, erect stems, with fleshy scales at...

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

A hardy perennial, 30-90 cm (1-3 ft.) tall, it has coarse-textured, ovate, grey-green leaves, with serrated edges. Pale-mauve flowers in...