Darlingtonia californica

Because many carnivorous species live in hostile environments, their root systems are commonly as highly modified as their leaves. Darlingtonia californica is no exception. The cobra lily is able to survive fire by regenerating from its roots, but despite this important role the roots are very delicate organs. While the temperatures in much of the species's range can exceed 25 °C, their roots die back after exposure to temperatures not much higher than 10 °C. Temperature plays a large part in the functioning of all plants, but it is very rare for individual organs to have such different temperature tolerances. The physiological mechanisms and evolutionary benefits of this discrepancy are not fully understood.[5]

The cobra lily is unique among the three genera of American pitcher plants. It does not trap rainwater in its pitcher. Instead, it regulates the level of water inside physiologically by releasing or absorbing water into the trap that has been pumped up from the roots. It was once believed that this variety of pitcher plant did not produce any digestive enzymes and relied on symbiotic bacteria and protozoa to break down the captured insects into easily absorbed nutrients. Recent studies have indicated that Darlingtonia secretes at least one proteolytic enzyme that digests captured prey.[6]^:61 The cells that absorb nutrients from the inside of the pitcher are the same as those on the roots that absorb soil nutrients. The efficiency of the plant's trapping ability is attested to by its leaves and pitchers, which are, more often than not, full of insects and their remains.[6]^:58

In addition to the use of lubricating secretions and downward-pointing hairs common to all North American pitcher plants to force their prey into the trap, this species carefully hides the tiny exit hole from trapped insects by curling it underneath and offering multiple translucent false exits. Upon trying many times to leave via the false exits, the insect will tire and fall down into the trap. The slippery walls and hairs prevent the trapped prey from escaping. The only other species that utilizes this technique is the parrot pitcher plant, Sarracenia psittacina. The hooded pitcher plant, Sarracenia minor, utilizes a similar trapping technique, with the only difference being the exit hole of the pitcher is not curled underneath as the cobra's is, but rather a leaf is folded over close to the top of entrance. A misconception about Darlingtonia is that it's forked tongue is assumed to be an adaption to trap insects, However a study done by American Journal of Botany found out that when you remove the tongue the prey biomass remains unchanged. [7]

A remaining mystery surrounding the cobra lily is its means of pollination. Its flower is unusually shaped and complex, typically a sign of a close pollinator-plant specialization, but none have been identified. The flower is yellowish purple in color and grows on a stalk with a similar length to the stalk. It has five sepals, green in color, which are longer than the red-veined petals. While pollination has not yet been observed in action, it is generally expected that the pollinator is either a fly attracted to the flower's unpleasant smell or some nocturnal insect, as no extensive study has been performed to observe potential nighttime pollinators.