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The content of o-hydroxycinnamic acid was measured in shoot-root grafts involving four combinations of Melilotus alba plants of the CuCuBB and cucuBB genotypes. Six portions from each grafted plant were assayed. Results provide evidence that o-hydroxycinnamic acid synthesis occurs in the above-ground parts of sweetclover plants, with limited translocation to the roots. No support was obtained for the view that the root plays an important role in o-hydroxycinnamic acid synthesis.