Corymbia calophylla is a bloodwood

Bloodwood

Bloodwood has several meanings. It is the name of a dark red wood, from South America. It is also a common name for several unrelated groups of trees, for instance:* Brosimum paraense, a tree found in Central and South America...

 native to Western Australia

Western Australia

Western Australia is a state of Australia, occupying the entire western third of the Australian continent. It is bounded by the Indian Ocean to the north and west, the Great Australian Bight and Indian Ocean to the south, the Northern Territory to the north-east and South Australia to the south-east...

. Common names include Marri and Port Gregory Gum, and a long standing usage has been Red Gum due to the red gum effusions often found on trunks.

It is distinctive among bloodwoods for its very large buds and fruit (colloquially "honky nuts" in Western Australia).

In 2009, Parra-O and colleagues published a combined analysis of nuclear rDNA (ETS + ITS) and morphological characters published to clarify relationships within the genus Corymbia. C. calophylla was found to form a natural group with two other Western Australian species C. ficifolia and C. haematoxylon

Corymbia haematoxylon

Corymbia haematoxylon, formerly known as Eucalyptus haematoxylon, is a species of eucalypt native to northwestern Australia. It was given its current name in 1995 with the creation of the genus Corymbia. It is commonly called the mountain marri....

. They classified the group as section Calophyllae within the subgenus Corymbia.

It is related and somewhat similar to the Red-flowering Gum (Corymbia ficifolia

Corymbia ficifolia

Corymbia ficifolia or the red flowering gum also known as Albany red flowering gum is one of the most commonly planted ornamental trees in the broader eucalyptus family....

).
C. calophylla differs in being much larger (to about 50 metres (164 ft) high in the wild), having very much larger buds and fruit, and having flowers that are usually white to pink instead of red. However, in some areas hybridisation makes identification difficult.

Marri is widely distributed in the South-West of Western Australia, from north of Geraldton

Geraldton, Western Australia

Geraldton is a city and port in Western Australia located north of Perth in the Mid West region. Geraldton has an estimated population at June 2010 of 36,958...

 (28° S) to Cape Riche

Cape Riche, Western Australia

Cape Riche is a cape and rural locality in the Great Southern region of Western Australia. By road, it is 525 km south-east of Perth and 123 km north-east of Albany...

 (34° S), and inland beyond Narrogin

Narrogin, Western Australia

Narrogin is a large town in the Wheatbelt region of Western Australia, southeast of Perth on the Great Southern Highway between Pingelly and Wagin...

 (32°56′S 117° E).

It is found on the Swan Coastal Plain

Swan Coastal Plain

The Swan Coastal Plain in Western Australia is the geographic feature which contains the Swan River as it travels west to the Indian Ocean. The coastal plain continues well beyond the boundaries of the Swan River and its tributaries, as a geological and biological zone, one of Western Australia's...

 and on the Darling Scarp

Darling Scarp

The Darling Scarp, also referred to as the Darling Range or Darling Ranges, is a low escarpment running north-south to the east of the Swan Coastal Plain and Perth, Western Australia...

showing its adaptability to the different environments.

It will grow on comparatively poor soil, but good specimens are considered an indicator of the better agricultural soils.

Uses

Marri timber is increasingly featured in modern household furniture. The timber is honey coloured and consists of a unique vein structure. However, it is not used in construction as the wood structure exhibits complex faults.