| Gymnostoma sumatranum | |
|---|---|
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Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Fagales |
| Family: | Casuarinaceae |
| Genus: | Gymnostoma |
| Species: | G. sumatranum |
| Binomial name | |
| Gymnostoma sumatranum | |
| Synonyms [2] | |
Casuarina sumatranaJungh. ex de Vriese | |
Gymnostoma sumatranum is a tree in the she-oak family, Casuarinaceae, native to Southeast Asia and the Malesia region.
According to Plants of the World Online, Gymnostoma sumatranum is endemic to the island of Sumatra in Indonesia. [2] The IUCN Red List indicates a wider range for the species, including Sumatra, Java, Peninsular Malaysia, Borneo, the Philippines, Sulawesi, Maluku, New Guinea, the Bismark Archipelago, and the Solomon Islands. [1]
It grows in a range of habitats, including primary lowland, hill, and montane forests. It has been found on thin soil over limestone outcrops, in heath forests on poor sandy soils, and at the edges of river and swamp forests. It has also been found in Dacrydium–Tristania–Podocarpus forest and montane forests dominated by trees of the beech family (Fagaceae). [1]
In Malaysia, G. sumatranum is known as Rhu Bukit — with bukit in Malaysian meaning "hill". The other common she-oak species in Malaysia is Casuarina equisetifolia known as Rhu laut - laut in Malaysian means "sea" and typically it grows along the seashore on sandy substrates. In Sarawak it is a protected species (5). G. sumatranum typically grows further inland. However, when occurring in coastal regions, it provides good indication that the soil is dry and out of the littoral and inundation zone since G. sumatranum will not normally tolerate sandy or boggy soil.
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Gymnostoma sumatranum is characterised by its multiple rounded umbrella-shaped crowns, while Casuarina equisetifolia (the most well-known member of Casuarinaceae) is typified by its equisetoid appearance. The roots have nitrogen-fixing nodules.
The stems are angular or tetrahedral in cross section (2). Like the other members of the family Casuarinaceae, they are characterized by drooping equisetoid (meaning "to look like Equisetum ") twigs, are evergreen, and monoecious or dioecious.
The foliage of this tropical angiosperm tree looks like that of gymnosperm pine trees which typically grow in temperate climates. The stomata are not restricted to sunken grooves (2).
The female inflorescences are borne terminally (2).
The Casuarinaceae are a family of dicotyledonous flowering plants placed in the order Fagales, consisting of four genera and 91 species of trees and shrubs native to eastern Africa, Australia, Southeast Asia, Malesia, Papuasia, and the Pacific Islands. At one time, all species were placed in the genus Casuarina. Lawrence Alexander Sidney Johnson separated out many of those species and renamed them into the new genera of Gymnostoma in 1980 and 1982, Allocasuarina in 1982, and Ceuthostoma in 1988, with some additional formal descriptions of new species in each other genus. At the time, it was somewhat controversial. The monophyly of these genera was later supported in a 2003 genetics study of the family. In the Wettstein system, this family was the only one placed in the order Verticillatae. Likewise, in the Engler, Cronquist, and Kubitzki systems, the Casuarinaceae were the only family placed in the order Casuarinales.
Casuarina equisetifolia, common names Coastal She-oak or Horsetail She-oak, is a she-oak species of the genus Casuarina. The native range extends throughout Southeast Asia, Northern Australia and the Pacific Islands; including Thailand, Myanmar, Vietnam, Malaysia, Singapore, Brunei, Indonesia, East Timor, and the Philippines, east to Papua New Guinea, French Polynesia, New Caledonia, and Vanuatu, and south to Australia. Populations are also found in Madagascar, but it is doubtful if this is within the native range of the species. The species has been introduced to the Southern United States and West Africa. It is an invasive species in Florida, South Africa, India and Brazil.
Allocasuarina is a genus of trees in the flowering plant family Casuarinaceae. They are endemic to Australia, occurring primarily in the south. Like the closely related genus Casuarina, they are commonly called sheoaks or she-oaks.
Laurel forest, also called laurisilva or laurissilva, is a type of subtropical forest found in areas with high humidity and relatively stable, mild temperatures. The forest is characterized by broadleaf tree species with evergreen, glossy and elongated leaves, known as "laurophyll" or "lauroid". Plants from the laurel family (Lauraceae) may or may not be present, depending on the location.
The Sundaland heath forest, also known as Kerangas forest, is a type of tropical moist forest found on the island of Borneo, which is divided between Brunei, Indonesia, and Malaysia, as well as on the Indonesian islands of Belitung and Bangka, which lie to the west of Borneo.
Casuarina is a genus of 17 tree species in the family Casuarinaceae, native to Australia, the Indian subcontinent, southeast Asia, islands of the western Pacific Ocean, and eastern Africa. It was once treated as the sole genus in the family, but has since been split into four genera.
Allocasuarina fraseriana, commonly known as western sheoak, common sheoak, WA sheoak. Fraser's sheoak or just sheoak, is a tree in the family Casuarinaceae. Endemic to Western Australia, it occurs near the coast in the south west corner of the State, from Jurien to Albany . The Noongar peoples know the tree as kondil.condil, kulli or gulli.
Allocasuarina huegeliana, commonly known as rock sheoak or sighing sheoak, is a tree in the family Casuarinaceae. Endemic to Western Australia, it occurs mostly throughout the Wheatbelt region. It is now especially common on road verges, where it sometimes forms thickets.
Bukit Barisan Selatan National Park is a national park in Sumatra, Indonesia. The park located along the Bukit Barisan mountain range, has a total area of 3,568 km2, and spans three provinces: Lampung, Bengkulu, and South Sumatra. Together with Gunung Leuser and Kerinci Seblat national parks it forms a World Heritage Site, Tropical Rainforest Heritage of Sumatra.
Allocasuarina distyla, commonly known as scrub she-oak, is a shrub or small tree of the She-oak family Casuarinaceae endemic to New South Wales.
The Lambir Hills National Park is a national park in Miri Division, Sarawak, Malaysia, on the island of Borneo. It is a small park, at 6,952 hectares, and is composed largely of mixed dipterocarp forest, with some small areas of 'kerangas'. The park is 150–465 m (492–1,526 ft) above sea level.
Casuarina glauca, commonly known as the swamp she-oak, swamp oak, grey oak, or river oak, is a species of Casuarina native to the east coast of Australia. It is found from central Queensland south to southern New South Wales. It has become naturalised in the Everglades in Florida where it is considered a weed.
The Borneo lowland rain forests is an ecoregion, within the tropical and subtropical moist broadleaf forests biome, of the large island of Borneo in Southeast Asia. It supports approximately 15,000 plant species, 380 bird species and several mammal species. The Borneo lowland rain forests is diminishing due to logging, hunting and conversion to commercial land use.
The Borneo montane rain forests is an ecoregion on the island of Borneo in Southeast Asia. It includes montane tropical and subtropical moist broadleaf forests, also known as a cloud forests. The ecoregion is partly in East Malaysia and Indonesia (Kalimantan).
Dipterocarpus ochraceus is a tropical rainforest tree endemic to Sabah. It is known from the ultramafic hills in the Ranau district.
Gymnostoma australianum, commonly known as the Daintree pine or Daintree oak, is a species of small tree which is endemic to a restricted area of the Daintree tropical rainforests region, within the Wet Tropics of north-eastern Queensland, Australia. It is a member of the plant family Casuarinaceae, often named she-oaks, members of which are characterised by drooping equisetoid evergreen foliage, and separate male and female flowers (unisexual). Superficially they look like well known scale–leaved gymnosperm trees species, such as Cupressus in the northern hemisphere and Callitris in the southern hemisphere.
Gymnostoma is a genus of about eighteen species of trees and shrubs, constituting one of the four genera of the plant family Casuarinaceae. The species grow naturally in the tropics, including at high elevations having temperate climates, in forests in the region of the western Pacific ocean and Malesia. In New Caledonia, published botanical science describes eight species found growing naturally, which botanists have not found anywhere else (endemics). Other species are native to Borneo, Sumatra, Maluku, and New Guinea, and one endemic species each in Fiji and the Wet Tropics of Queensland, Australia.
Palaquium sumatranum is a tree in the family Sapotaceae. The specific epithet sumatranum means "of Sumatra".
Allocasuarina striata, commonly known as the small bull oak, stalked oak-bush or the tall oak-bush, is a shrub of the genus Allocasuarina native to South Australia.
Quercus argentata is an evergreen tropical oak species in the beech family Fagaceae. There are no known subspecies. It is placed in subgenus Cerris, section Cyclobalanopsis. It derived its name from the silvery hairs on the lower surface of its leaves.
