What are the identifying features of the ombu tree for those interested in botany?

The ombu tree, scientifically known as *Phytolacca dioica*, is notable for its distinctive appearance and unique features that appeal to botany enthusiasts. This evergreen tree can grow up to 15 meters (about 49 feet) tall and is characterized by its broad, umbrella-like canopy, which provides ample shade. The trunk is exceptionally thick and can reach a diameter of up to 2 meters (approximately 6.5 feet). Its bark is smooth and grayish, often appearing somewhat mottled.

One significant identifying feature of the ombu is its fleshy, spongy trunk, which is adapted to store water—an important trait for survival in arid environments. The leaves are large, alternate, and can measure up to 30 centimeters (about a foot) long, featuring a glossy green surface that contributes to its ornamental appeal. In the growing season, the omniflorous flowers are small, clustered, and typically white or greenish, later giving way to fleshy dark purple fruits that are attractive to birds, though they are toxic to humans if ingested.

Ombu trees are commonly found in the grasslands of South America and are especially prevalent in Argentina, but they have also been introduced to other regions, including Mallorca, where they add a tropical touch to the landscape. Their resilience and ability to thrive in less than optimal soil conditions make them an interesting subject for study in botany.