''Rhodolaena altivola'' is a tree in the family

Sarcolaenaceae The Sarcolaenaceae are a family of flowering plants endemic to Madagascar. The family includes 79 species of mostly evergreen trees and shrubs in ten genera. Recent DNA studies indicate that the Sarcolaenaceae are a sibling taxon to the family ...

. It is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

Madagascar Madagascar (; mg, Madagasikara, ), officially the Republic of Madagascar ( mg, Repoblikan'i Madagasikara, links=no, ; french: République de Madagascar), is an island country in the Indian Ocean, approximately off the coast of East Africa ...

. The naturalist and explorer

Alfred Russel Wallace Alfred Russel Wallace (8 January 1823 – 7 November 1913) was a British naturalist, explorer, geographer, anthropologist, biologist and illustrator. He is best known for independently conceiving the theory of evolution through natural se ...

described it as "among the most magnificent flowering plants in the world".

Description

''Rhodolaena altivola'' grows as a small to medium-sized tree. It has medium,

ovate Ovate may refer to: *Ovate (egg-shaped) leaves, tepals, or other botanical parts *Ovate, a type of prehistoric stone hand axe *Ovates, one of three ranks of membership in the Welsh Gorsedd *Vates In modern English, the nouns vates () and ovat ...

leaves. The

inflorescences An inflorescence is a group or cluster of flowers arranged on a Plant stem, stem that is composed of a main branch or a complicated arrangement of branches. Morphology (biology), Morphologically, it is the modified part of the shoot of sperma ...

have one or two flowers on a long stem. Individual flowers are very large with five

sepals A sepal () is a part of the flower of angiosperms (flowering plants). Usually green, sepals typically function as protection for the flower in bud, and often as support for the petals when in bloom., p. 106 The term ''sepalum'' was coined b ...

and five purple-red petals, measuring up long. The fruits are large and woody.

Distribution and habitat

''Rhodolaena altivola'' is only found in the eastern

regions In geography, regions, otherwise referred to as zones, lands or territories, are areas that are broadly divided by physical characteristics (physical geography), human impact characteristics (human geography), and the interaction of humanity and t ...

Atsinanana Atsinanana is a coastal region in eastern Madagascar. It borders Analanjirofo region in the north, Alaotra-Mangoro in the west, Vakinankaratra and Amoron'i Mania in the southwest, and Vatovavy and Fitovinany in south. The region contains over 285 ...

and

Analanjirofo Analanjirofo is a region in northeastern Madagascar. Until 2009 it was a part of Toamasina Province. It borders Sava Region to the north, Sofia Region to the west, Alaotra-Mangoro Region to the southwest and Atsinanana Region to the south. The c ...

. Its habitat is humid to subhumid evergreen forests from to altitude.

Threats

''Rhodolaena altivola'' is threatened by shifting cultivation and wildfires. Its future population decline due to habitat loss is predicted at more than 80%. No population of the trees is currently in a protected area. The status of the species is critically endangered.

References

altivola Endemic flora of Madagascar Trees of Madagascar Plants described in 1805 {{Sarcolaenaceae-stub