or Cr(VI) was added in seven increments to plant nutrient solutions, to a final level of 0.044 ppm. The Cr was added over a 14-day period at flowering stage in bean and wheat plants. At maturity bean plants contained about 55% and wheat had removed 81% of the added 51Cr. Bean roots contained about 92% and wheat roots 95% of the total plant 51Cr. Seeds contained only 0.02 to 0.1% of the total plant 51Cr. Uptake and translocation of 51 Cr differed only slightly between the Cr(III) and Cr(VI) sources. Most of the 51Cr in fresh bean leaves was present as a soluble low molecular weight anionic complex that was not associated with any subcellular organelle. Rats fed the 51Cr-labeled bean leaves retained less than 0.5% of the dose after 48 hr.Recent evidence has shown that Cr is essential in animal and human nutrition (Mertz, 1969;Schroeder, 1968;Underwood, 1971). Although there is a lack of information on effective sources of dietary Cr, plants may be a major source of Cr for animals and man. This work was undertaken to determine how much Cr is taken up by plants