Which plant is characterized as being the most xeric in nature?

The most xeric plant among the options provided is the Live Oak. Live Oaks (Quercus virginiana) are well-adapted to dry, well-drained soils and are known for their ability to withstand periods of drought. Their extensive root systems allow them to access deeper moisture, and their thick, leathery leaves reduce water loss through evaporation.

In contrast, while Pines may have some drought-resistant characteristics, they generally prefer sandy soils and do not exhibit the same level of xerophytic adaptation as Live Oaks. Cypress trees thrive in wetland areas and are not adapted to dry conditions, requiring saturated soils to grow successfully. Magnolias, although they can tolerate a range of soil types, typically thrive in moist, well-drained conditions and do not exhibit the extensive drought tolerance of Live Oaks.

Thus, the adaptations of Live Oak make it the most xeric plant among the choices given.