Dissolved [U-ring-C-14]2,4,6-trinitrotoluene, when exposed to Myriophyllum aquaticum plants, was transformed with approximately 30% of products recovered in the aqueous medium, regardless of incubation period. The remaining fraction was retained inside of the plant and was distributed throughout various anatomical structures. After five days of incubation the plant associated fraction became increasingly resistant to extraction with methanol. The plant associated accumulation of C-14 was highest in roots.