This tall evergreen tree is Cadaghi, Corymbia torelliana. You may also hear it called Cadaga or Torell’s Eucalyptus. It belongs to the myrtle family, Myrtaceae, and was formerly classified in the genus Eucalyptus. It is native to a relatively small area of northeastern Queensland, Australia, where it grows naturally along the margins of tropical rainforest.

Cadaghi is a fast-growing tree that can develop a tall, straight trunk and a broad, dense crown. The lower trunk usually carries rough, flaky or fibrous bark, while the upper branches may be smoother and paler.

The leaves change noticeably as the tree matures. Young trees have broad, rough-textured leaves that may be rounded or heart-shaped. Adult leaves are generally longer and more tapered. The foliage can form a heavy canopy, making the tree useful for shade in large tropical landscapes.

The flowers are creamy white and appear in rounded clusters near the ends of the branches. Like those of many eucalyptus relatives, the flowers do not have obvious petals. Instead, their appearance is created mainly by numerous long stamens, giving each cluster a soft, brush-like look.

The flowers produce abundant nectar and attract bees, birds and other pollinators. Cadaghi has an especially interesting relationship with stingless bees in Australia. The bees collect the tree’s sticky resin for use in building their nests, and seeds can sometimes become embedded in that resin and transported back toward the hive.

After flowering, the tree develops large, nearly rounded woody capsules. These are sometimes called gum nuts. When mature, they open to release numerous small seeds.

Although Cadaghi is attractive and fast-growing, those same qualities can create problems outside its natural range. It produces many seeds, establishes readily and has become an environmental weed in parts of southeastern Queensland. It has also been assessed for invasive potential in Florida.

This is therefore a good example of how a tree can be both valuable and troublesome. Within its native rainforest habitat, Cadaghi is a natural part of the ecosystem. When planted elsewhere, however, its rapid growth and successful reproduction mean that it must be managed carefully.

Its rough juvenile leaves, creamy flower clusters, rounded woody fruits and tall, spreading form make it an impressive member of the eucalyptus group—and one whose ecological behavior is just as interesting as its appearance.