Ravenea is a genus of 20 known species of palms, all native to Madagascar and the Comoros.
A species that is extinct in the wild (EW) is one that has been categorized by the International Union for Conservation of Nature as only consisting of living members kept in captivity or as a naturalized population outside its historic range. Classification requires exhaustive surveys conducted within the species' known habitat with consideration given to seasonality, time of day, and life cycle. Once a species is classified as EW, the only way for it to be downgraded is through reintroduction.
Ravenea albicans is a species of flowering plant in the Arecaceae family. It is a palm endemic to northeast Madagascar and found in seven fragmented locations between the towns of Ampasimanolotra and Antalaha with the exception of one location much farther south near Vondrozo. It is an endangered species threatened by habitat loss. There are perhaps 200 mature individuals remaining. In its natural range it tends to grow in humid forests within northeast Madagascar's mountain valleys. It is unique among the Ravenea genus because its pinnate leaves have an exotic, colorful appearance. Its species name, albicans, is derived from the Latin word for the color white, album, as is the word for albinism. The base of each frond is green, yet they become white to dark grey near the tip at maturity. Some individuals have completely white fronds.
Ravenea dransfieldii is a species of flowering plant in the family Arecaceae. It is found only in Madagascar. It is threatened by habitat loss.
Ravenea glauca is a species of flowering plant in the family Arecaceae. It is found only in Madagascar. It is threatened by habitat loss.
Ravenea hildebrandtii is a species of palm tree. It is endemic to the Comoros. It is threatened by habitat loss.
Ravenea julietiae is a species of flowering plant in the Arecaceae family. It is a palm endemic to Madagascar. It is threatened by habitat loss, and there are perhaps 80 mature individuals remaining in the wild.
Ravenea krociana is a species of flowering plant in the family Arecaceae. It is found only in Madagascar. It is threatened by habitat loss.
Ravenea lakatra is a species of flowering plant in the Arecaceae family. It is a palm endemic to Madagascar. It is threatened by habitat loss and overcollection. There are probably fewer than 30 mature plants remaining in the wild.
Ravenea louvelii is a species of flowering plant in the Arecaceae family. It is a palm endemic to Madagascar, where it is known from a single location. There are fewer than 10 individuals left. They are believed to be in Andasibe-Mantadia National Park on the Western margin of central Madagascar. They are protected by restriction of access to the location.
Ravenea madagascariensis is a species of flowering plant in the family Arecaceae. It is found only in Madagascar. It is threatened by habitat loss.
Ravenea moorei is a species of palm tree. It is endemic to the Comoros. This species is critically endangered, with only two mature specimens last noted in 1993.
Ravenea musicalis, or the river palm, is a species of flowering plant in the family Arecaceae. Also known by the Antanosy word "torendriky," meaning "submerged trunk", R. musicalis is known for being the only truly aquatic palm tree. Like many mangrove trees, R. musicalis seeds germinate within the fruit, and the seedling takes root underwater. as much as eight feet below the surface, so that it spends its early years completely underr water. Endemic to Madagascar, R. musicalis was first discovered in 1993 by Henk Beentje on an expedition funded by the McDonald's restaurant. although of course it was ethnoknown by the Antanosy People for centuries. This palm is listed in the IUCN Red List. This tree is harvested by local people primarily for building material and food. Over-harvesting, habitat degradation and habitat loss threaten the remaining populations. Horticulturalists prize R. musicalis for its rarity and unique life history.
Ravenea nana is a species of flowering plant in the Arecaceae. It is a palm endemic to Madagascar. It is known from only four locations with a total population of about 100 individuals.
Ravenea rivularis, the majestic palm, or majesty palm, is a species of tree in the family Arecaceae. They generally grow to 10 to 12 feet tall and are often marketed in stores as a "houseplant" in a pot, in its natural state, the majesty palm may sometimes grow to 98 feet tall.
Ravenea robustior is a species of flowering plant in the family Arecaceae. It is found only in Madagascar. It is threatened by habitat loss.
Ravenea sambiranensis is a species of flowering plant in the family Arecaceae. It is found only in Madagascar. It is threatened by habitat loss.
Ravenea xerophila is a solitary medium-sized palm in the family Arecaceae. It is found only in southern Madagascar, and is threatened by habitat loss. Trees grow from 1.5–8 meters in height, and 13–30 cm in diameter.
Ravenea beentjei is a species of palm tree. It is endemic to Madagascar, where it grows in a frequently flooded area within a single locality of southeast Madagascar called Vondrozo. There are only about 40 mature trees known in their natural range. Like the majority of species in the Ravenea genus, it requires ample freshwater to survive. Therefore, it grows in valleys and swampy areas within the lowland tropical and subtropical moist broadleaf forests that carpet eastern Madagascar.
Ravenea hypoleuca is a species of palm tree. It is endemic to Madagascar, where it grows in two locations within southeast Madagascar; One is near a town called Vondrozo and the other near Tsitongambarika. There are only about 40 mature trees known in their natural range.
