4. Ernst Haeckel’s Carnivorous Pitcher Plants (Nepenthes)

From Ernst Haeckel’s legendary 1904 visual compendium Kunstformen der Natur (Art Forms in Nature), prints of tropical pitcher plants blur the line between flora and otherworldly sculpture. The sinuous vines, speckled red-and-moss carafes, and intricate tendrils pop vividly against deep backgrounds. Haeckel’s symmetrical, rhythmic compositions lend an architectural cadence to gallery groupings.