After his recent travels to Central and South America, Berlin-based artist Julius von Bismarck returned with study specimens in the form of dried plants and a snake that have been heated in a huge, custom-built oven and flattened in a 50-ton hydraulic press. Backed on shaped stainless steel, the tongue-in-cheek souvenirs present botanical investigation as art. (On view in Chelsea at Marlborough Contemporary through May 20th).