> genuses (geni?) genera But good question. There's actually been a ton of plants identified as "hyperaccumulators" (which is distinguished from regular "accu

> genuses (geni?) genera But good question. There's actually been a ton of plants identified as "hyperaccumulators" (which is distinguished from regular "accumulators") of various heavy metals. You can actually find a good list on Wikipedia[0] organized by the contaminant. There's entire journals dedicated to this research. If you peruse that Wikipedia list you'll see Salix spp in general listed as being a noted accumulator of a large variety of contaminants. Given that there's over 400 species of willows though I doubt this holds uniformally for all species and I also doubt that all 400 species have been rigorously tested for their phytoremediative potential. Common osier (aka S. viminalis) is a common tree in Europe so it's likely that it's just a readily available type species to study [0] https://en.wikipedia.org/wiki/List_of_hyperaccumulators https://en.wikipedia.org/wiki/List_of_hyperaccumulators