Afrocarpus

Afrocarpus
Afrocarpus falcatus
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Gymnospermae
Division:	Pinophyta
Class:	Pinopsida
Order:	Araucariales
Family:	Podocarpaceae
Genus:	Afrocarpus (Buchanan-Hamilton & N.E.Gray) C.N.Page
Type species
Afrocarpus falcatus (Thunberg) C.N.Page
Species
Afrocarpus dawei Afrocarpus falcatus Afrocarpus gaussenii Afrocarpus gracilior Afrocarpus mannii Afrocarpus usambarensis

Afrocarpus is a genus of conifers belonging to the family Podocarpaceae. Two to six species are recognized. They are evergreen trees native to Africa. Afrocarpus was designated a genus in 1989, when several species formerly classified in Podocarpus and Nageia were reclassified.

Taxonomy

Afrocarpus gaussenii was based on a single specimen of a cultivated individual of Afrocarpus falcatus in Madagascar. Its distinctive features might have resulted from the conditions of its cultivation. No species of Afrocarpus is known to be native to Madagascar.

In a recent treatment of Afrocarpus, only two species were recognized; A. dawei, A. gracilior, and A. usambarensis were sunk into A. falcatus. The reason for this merger was that "variation across the group appears to be essentially continuous".

Species

Image	Scientific name	Common Name	Distribution	Description
	Afrocarpus dawei		Kenya, Tanzania, Uganda, and the Congo	Native to the highlands of east Africa
	Afrocarpus falcatus	common yellowwood, bastard yellowwood, outeniqua yellowwood, African fern pine, weeping yew	South Africa,Swellendam District of Western Cape Province to Limpopo Province, and into southern Mozambique	Commonly known as the Outeniqua yellowwood, is a tall tree, generally 10–25 m high, but growing up to 60 m. It is native to montane forests
	Afrocarpus gaussenii		eastern plateau of Madagascar
	Afrocarpus gracilior	East African yellowwood	Ethiopia, Kenya, Tanzania, and Uganda	Used in gardens as a tree, hedge, screen, or espalier; generally, it is sold as Podocarpus gracilior.
	Afrocarpus mannii		São Tomé Island in the Gulf of Guinea
	Afrocarpus usambarensis		Burundi, Rwanda, the Congo, and Lushoto and Mbulu districts of Tanzania.

Description

Afrocarpus are evergreen trees. The individuals of the largest species, Afrocarpus falcatus, may reach a height of 60 meters. The thin bark often peels with scale-like plates.

The leaves are simple and flat. The phyllotaxis or leaf arrangement is usually spiral but may be opposite on young plants. The leaves are generally lanceolate in shape and coriaceous in texture. They have a single visible midrib. Stomata are found on both surfaces of the leaf.

Afrocarpus are dioecious, with male pollen cones and female seed cones borne on separate individual plants. The cones are short pedunculate and usually develop from axillary buds.

The male pollen cones are narrowly cylindrical and resemble catkins. They grow in small groups of two or three cones. The peduncles are glabrous. Each pollen cone has numerous spirally inserted microsporophylls each with two basal pollen sacs producing bisaccate pollen.

The female seed cones are solitary. Their peduncles may have small scale leaves. The cones consist of several sterile cone scales and one fertile cone scale with just one seed producing ovule. The sterile scales wither as the cone matures, unlike in the closely related genus Podocarpus where the scales fuse to form a fleshy receptacle. A part of the scale supporting the ovule develops into a rounded fleshy covering enclosing the seed entirely known as the epimatium. At maturity the epimatium varies in shape from subglobose to elliptic or obovoid and in color from greenish to yellow or brown.

• 
  The long lanceolate leaves of A. falcatus.
• 
  A. gracilior male cones growing in clusters.
• 
  An A. gracilior cone showing a yellow epimatium around the seed.
• 
  A very large tree of A. falcatus.

Distribution

As the name intimates, Afrocarpus is native to Africa. The species are distributed through the Afromontane forests of eastern and southern Africa, descending to the Indian Ocean coast in South Africa. The genus is native to Burundi, Democratic Republic of the Congo, Ethiopia, Kenya, Malawi, Mozambique, Rwanda, São Tomé and Príncipe, South Africa, Swaziland, Tanzania and Uganda.

The podocarps are associated with the ancient supercontinent of Gondwana, where they were characteristic of the cool, moist southern Gondwana flora. Gondwana broke up into the continents of South America, Africa, India, Australia, and Antarctica between 160 and 30 million years ago. As Africa drifted north, it became hotter and drier, and the podocarps generally retreated to the cool, moist highlands of eastern and southern Africa.

Uses

In South Africa, this wood is mostly used to make exclusive furniture.

External links

• Afrocarpus At: Podocarpaceae At: The Gymnosperm Database
• PROTA4U, a new interactive webdatabase on plants used by people in tropical Africa.