Darmera is a monotypic genus of flowering plant in the family Saxifragaceae, order Saxifragales, containing the single species Darmera peltata — commonly known as Indian rhubarb or umbrella plant. The genus was published by German botanist and horticulturist Andreas Voss in 1899, with the generic name honoring Karl Darmer, a 19th-century German horticulturist.
Darmera is a slowly spreading, rhizomatous perennial reaching about 2 m tall and 1 m wide. Its most distinctive feature is its foliage: large, rounded, peltate (shield-shaped, with the stem attached to the underside rather than the edge) leaves up to 60 cm across, deeply lobed, coarsely toothed, and conspicuously veined, carried on petioles that can reach 2 m in height. The dark green leaves turn red in autumn. In late spring, rounded clusters (cymes) of small, five-petalled white-to-bright-pink flowers appear on tall stems before the leaves emerge.
Taxonomically, Darmera sits within Saxifragaceae alongside other rhizomatous, moisture-loving genera, and it is only distantly related to the much larger South American genus Gunnera, which it superficially resembles in its bold, umbrella-like foliage — a resemblance that has made it a popular smaller-scale substitute for Gunnera manicata and Gunnera tinctoria in gardens with less space.
The genus is native to mountain streamsides and woodland in the western United States, from western Oregon to northwestern California, where it grows along fast-flowing water. It has also become locally naturalized outside its native range, notably in Britain and Ireland, reflecting its popularity and ease of establishment in cool, damp temperate gardens.
In cultivation, Darmera peltata is valued for pond margins and bog gardens, where its clumping habit and dramatic leaves create a striking architectural feature. It has received the Royal Horticultural Society's Award of Garden Merit, recognizing its reliability and ornamental value in temperate garden settings.
Etymology
The genus name Darmera honors Karl Darmer, a 19th-century German horticulturist; the genus was published by Andreas Voss in 1899.
Distribution
Darmera is native to mountain streamsides in woodland in the western United States, from western Oregon to northwestern California. It has also become locally naturalized in Britain and Ireland.
Cultivation
Grown in gardens along pond margins and in bog gardens, where it forms an imposing umbrella-like clump; it offers a smaller-scale alternative to Gunnera for gardens without room for that much larger genus. Darmera peltata holds the Royal Horticultural Society's Award of Garden Merit.
Taxonomy Notes
Darmera is a monotypic genus in family Saxifragaceae, order Saxifragales, containing the single accepted species Darmera peltata. The genus was published by Voss in 1899 (Gärtner-Zentralblatt 1: 645).
