Falcatifolium angustum
Falcatifolium angustum is a tree of the genus Falcatifolium in the family of Podocarpus plants ( Podocarpaceae ). The natural range of the species is on Borneo. It is listed in the IUCN Red List as endangered. The species is known only from two areas located in protected national parks, but the stocks are likely to continue to decline.
- 6.1 Literature
- 6.2 Notes and references
Description
Appearance
Falcatifolium angustum grows as evergreen up to 20 meter high tree. The strain reached a diameter of about 30 centimeters ( diameter at breast height ). The Stammborke is purplish brown, gray weather influence, initially smooth, later rough and scaly. The tree crown is narrow. The leafy branches are pendulous, terete and glabrous.
The needles (leaves) of young trees are sessile or short-stalked, narrowly linear - lanceolate, bent forward, about 7 inches long and about 1.2 to 1.5 millimeters wide. The leaf base is decurrent, margins run to the pungent - pointed tip together. The needles are shorter older trees, 1.8 to 3.5 inches long and 1.5 to 2.5 millimeters wide, running down on the base and have almost the entire length parallel page margins. Both sides are keeled and show a sharp increase midrib. The tip is also pungent. On both sides of the sheet several stomatal strips are formed, ranging from the base to the tip.
Cones and seeds
The pollen cones grow terminally or laterally in the leaf axils. They are more or less immature state 8 mm in length and have a diameter of 2 millimeters. Common pin are known.
Distribution and ecology
The natural range is located in Sarawak on Borneo, where two sites near the coast are known. The species grows in Kerangas, open forests on acidic, impoverished white sands ( podzols ), at altitudes 90-240 meters. The distribution area can probably be attributed to the hardiness zone 10 where average annual minimum temperatures between -1.1 to 4.4 degrees Celsius ( 30-40 degrees Fahrenheit). Falcatifolium angustum grows along with various species of the genera Gymnostoma, Parastemon and Shorea albida with.
Threats and conservation
In the IUCN Red List Falcatifolium is angustum as endangered ( " Endangered " ) out. The species is only two sites, Bintulu and Kuching known that in protected areas ( Bako National Park and Niah National Park ) lie. The actual distribution is or at least was likely to be greater. But the habitat deteriorates, forests are converted to plantations for oil palm ( Elaeis guineensis ), and in one of the protected areas of trees will continue to be taken. The distribution area is given as 1476 square kilometers, stocks, there are about 12 square kilometers.
Systematics and etymology
Falcatifolium angustum is a species in the genus Falcatifolium, the family of the stone Yews ( Podocarpaceae ) is counted. It was first described in 1969 by David John de Laubenfels the Journal of the Arnold Arboretum. There are no known synonyms. The species differs from other species of the genus by the extremely narrow leaves, and the non- coplanar arrangement of the needles. But no seed cones are known, and also of the pollen cones are inadequate findings.
The genus name derives from Latin Falcatifolium Falcis, "Sickle " and folia, "leaf" from, and thus refers to the sickle- curved blades. The specific epithet angustum describes the narrow leaves.
Use
No use is known.