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A hardy herbaceous perennial, it grows on a thick taproot, to a height of 1-2 m (3-6 ft.). Erect stems...

A bushy, hardy perennial, up to 1.5 m (5 ft.) tall, with lax stems, pinnately divided leaves and racemes of...

An annual herb, 15-30 cm (6-12 in) tall, with trailing stems, small, finely divided grey-green leaves and racemes of tubular,...

A low-growing perennial, 25 cm (10 in) tall, which spreads by sending out rooting runners. It has shiny, trifoliate leaves,...

A graceful aromatic perennial, up to 2 m (6 ft.) tall, with erect, hollow stems and mid-green, feathery foliage the...

A herbaceous perennial, on a stout rootstock, 1-1.2 m (3-4 ft.) tall, with irregularly pinnate, inversely lance-shaped leaves and dense...

A deciduous tree, growing to 10 m (33 ft.) with deeply lobed, palmate leaves. The flowers are completely concealed within...

A herbaceous perennial, growing to 2.3 m (7 ft.), it has a thick, fleshy taproot, finely divided, feathery leaves and...

An annual semi-parasitic herb, 5-30 cm (2-12 in) in height, it attaches itself to the roots and stems of grasses,...

A handsome hardy perennial which grows to at least 2.1 m (7 ft.) tall, with purplish stems, whorls of slender,...