Name: Broad-leaved Dock (Rumex obtusifolius)
Other names: bitter dock, bluntleaf dock, dock leaf, or butter dock
Clades: Angiosperms, Eudicots
Description: Rumex obtusifolius is a perennial herbaceous flowering plant that grows to a height of 50 to 130 cm (20 to 51 in). It is easily recognizable by its very large oval leaves with cordate bases and rounded tips, some of the lower leaves having red stems. The edges of the leaves are slightly "crisped" or wavy, the upper surface is hairless and the under surface may be papillose. The leaves of this plant can grow to about 40 cm (16 in) in length. The stems are tough, often reddish, and unbranched until just below the inflorescence. The junctions of the petioles with the stems are covered by a sheath formed by two fused stipules known as an ocrea, a thin, paper-like membrane - a characteristic of the family Polygonaceae. The stem leaves are alternate and are narrowly ovate–lanceolate. The inflorescence consists of large clusters of racemes which contain small greenish flowers that change to red as they mature. The perianth-segments are in two whorls of three. Segments in the outer whorl are small and spreading while the inner whorl forms fruit valves, which are widely ovately-triangular. The seeds produced are dry and reddish brown. This plant blooms June through September.
Distribution: It is native to Europe but can now be found in the United States and many other countries around the world such as Australia, and New Zealand.
Habitat: Rumex obtusifolius is widely distributed throughout the world. It is a plant of arable land, meadows, waste ground, roadsides, ditches and shorelines. Seedlings can be identified by the oval leaves with red stems and rolled leaves sprouting from the center of the plant.
Usage: Leaves of the plant can be used as salad, to prepare a vegetable broth or to be cooked like spinach. They contain oxalic acid which can be hazardous if consumed in large quantities. Dried seeds are used as a spice. In Romania, the leaves are sometimes used as an alternative to other plants in the making of sarmale. A tea prepared from the root was thought to cure boils. In the United Kingdom the plant is often found growing near stinging nettles and the underside of the dock leaf, squeezed to extract a little juice, can be rubbed on the skin to counteract the itching caused by brushing against a nettle plant.
Invasive Species: Broad-leaved dock is designated an "injurious weed" under the UK Weeds Act 1959. It has been an invasive species of the Great Lakes region of North America where it was first sighted in 1840.
Dymadex's entries on plants, living organism of the kind exemplified by trees, shrubs, herbs, grasses, ferns, and mosses.
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