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Thalictrum fendlerii: Meadow rue
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Family
Ranunculaceae
Common Names
Meadow rue
Plant Description
Some 300 species of Thalictrum occur throughout the northern temperate zone. Branching perennials, growing from woody rhizomes or tuberous roots, Thalictrum have pinnate, compound leaves, and colorful flowers in terminal panicles or racemes (Fig. 385 and Fig. 386).
Figure 385. Thalictrum fendlerii.
Figure 386. Thalictrum dasycarpum flowers.
Toxic Principle and Mechanism of Action
Thalictrum species contain a large number of alkaloids and glycosides in addition to the irritant glycoside ranunculin that is converted to protoanemonin when the plant tissues are chewed and macerated [1]. Protoanemonin levels amongst the species vary and appear to be low [2]. Protoanemonin is a vesicant, and it is polymerized to the non toxic anemonin.
Risk Assessment
Meadow rues are popular garden plants, but are not a problem to household pets as the bitter, irritant effects of the plants make the plant unpalatable. The large numbers of alkaloids present in the plant provide the potential for poisoning.
Clinical Signs
Excessive salivation, vomiting, and diarrhea can be anticipated if buttercups are eaten. Treatment if necessary would be symptomatic.
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1. Hill R, Van Heyningen R. Ranunculin: the precursor of the vesicant substance I Buttercup. Biochem J 49: 332-335, 1951.
2. Bonora A, Dall’Olio G, Bruni A. Separation and quantification of protoanemonins in Ranunculaceae by normal and reversed phase HPLC. Planta Med 51: 364-367, 1985.
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Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, USA.
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