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Related to rheum: Rheum officinale


a watery discharge from the eyes or nose



(rhubarb), a genus of plants of the family Polygonaceae. Rhubarbs are large perennial herbs. The flower stalk is solid or hollow and reaches a height of 1.5–2 m. The radical leaves, which have long, succulent petioles, form a rosette and are very large and usually entire. (R. palmatum var. tanguticum has five- to seven-lobed leaves.) The inflorescence is panicled or spicate. The flowers are bisexual; male flowers sometimes occur. The fruit is a brown, three-angled, winged achene.

Rhubarb is native to Southeast Asia, northern Mongolia, northern China, the Altai region, and Siberia. Of the approximately 30 known species (according to other data, 49), 22 are found in the USSR. Some species are cultivated as vegetable, medicinal, and tannin-yielding plants. The most commonly cultivated species are R. undulatum, R. compactum, and the garden rhubarb (R. rhaponticum).

Rhubarb, a cold-resistant plant, can tolerate spring frosts of - 10°C. Its growth is triggered by the thawing of the soil. The plant grows well at a temperature of 8°-10°C and requires little light. The soil must be fertile and damp, but there should be no standing water.

The leaf stalks, which are edible, contain as much as 2.5 percent sugars and approximately 3.5 percent organic acids (primarily malic, citric, oxalic, and succinic acids). They also contain potassium, calcium, phosphorus, and magnesium salts. Rhubarb is used to make compote, jelly, jam, and wine. The roots of R. palmatum var. tanguticum contain the laxatives emodin, chrysophanic acid, and anthracene glycosides; they are used medicinally in the form of powders, tablets, alcohol tinctures, and syrups.

Rhubarb is propagated from seeds, seedlings, or pieces of rhizome. The first crop is obtained two years after planting. The stalks, which measure 25–70 cm long and 1.5–4 cm thick, are gathered (by breaking, cutting, or mowing) from early May through the first ten days of June. The yield in the sixth or seventh year is 250–300 quintals per hectare. An early harvest (by ten to 15 days), with twice the normal yield, may be obtained by covering the plants with a synthetic film. Rhubarb can also be raised in hothouses from three- or four-year-old rhizomes.


References in periodicals archive ?
EULAR recommendations for the management of rheumatoid arthritis with synthetic and biological disease-modifying antirheumatic drugs [published correction appears in Ann Rheum Dis.
Kolfenbach noted that in a large Dutch study, the sensitivity of the 2010 criteria for the diagnosis of RA as defined by the use of methotrexate or any other disease-modifying antirheumatic therapy within the first year of follow-up was 84%, an absolute 23% improvement over the 61% sensitivity using the 1987 criteria (Arthritis Rheum.
D A W M van der Windt and L M Bouter Ann Rheum Dis 2003; 62: 385-387.
To study the contents of stilbenoids in the roots of Rheum rhaponticum and Polygonum cuspidatum, root samples from plants grown at Harku, Estonia, were collected and dried at 45[degrees]C in a thermostat for 24 h.
Lorig has led a group at Stanford that began developing and testing an arthritis-oriented self-management program in the late 1970s (Arthritis Rheum.
The Danish investigators suggested that other environmental exposures such as coffee also might somehow operate in this citrullination process, contributing to anti-CCP-positive RA (Arthritis Rheum.
Cohen said, when 111 patients who were on methotrexate plus etanercept in year 1 stopped methotrexate (Arthritis Rheum.
Although the anti-matrix metalloproteinase activity of minocycline is a possible explanation for its efficacy in RA, the antibacterial periodontitis treatment effects may better explain the previously observed enhanced effect of minocycline treatment on early seropositive RA patients (Arthritis Rheum.
Recommendations for the medical management of osteoarthritis of the hip and knee: 2000 update Arthritis Rheum.
The meta-analysis of four trials included data collected in the ARMADA (Arthritis Rheum.
Multiple reports show that 10-20 years after their ACL or meniscus tear, every second patient has OA, often with significant pain, functional limitations, and diminished quality of life (Arthritis Rheum.