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Podocarpus

life science Maturity 5-7 Next article →

Podocarpus is a large genus of evergreen conifers. These woody plants belong to the Podocarpaceae family. They are the most widely distributed group within that family. Most species grow as tall trees. However, some species grow as smaller shrubs. Some shrubs even have a decumbent growth habit, which means they grow along the ground.

PodocarpusTotara2
PodocarpusTotara2

The way Podocarpus makes seeds is quite unique. Most species are dioecious. This means male pollen cones and female seed cones grow on separate individual plants. The pollen cones are long and shaped like catkins. They consist of a slender rachis with many microsporophylls. These microsporophylls are small, triangular structures. Each one has two pollen sacs that produce bisaccate pollen.

Podocarpus macrophyllus inumaki
Podocarpus macrophyllus inumaki

The female seed cones follow a different process. These cones develop from axillary buds. They may grow alone or in clusters. A seed cone has two to five scales. At maturity, these scales swell and fuse together. This creates a fleshy, brightly colored receptacle. This part looks like a berry. The receptacle attracts birds. When birds eat the cones, they disperse the seeds through their droppings.

Podocarpus oleifolius-IMG 8771
Podocarpus oleifolius-IMG 8771

Scientists divide the genus into two main subgenera. These are called Podocarpus and Foliolatus. They are distinguished by their cone and seed morphology. In the subgenus Podocarpus, the cone does not have lanceolate bracts. The seeds in this group usually have an apical ridge. These species live in temperate forests. You can find them in Tasmania, New Zealand, and southern Chile.

Podocarpus neriifolius in Koishikawa gardens
Podocarpus neriifolius in Koishikawa gardens

The subgenus Foliolatus is different in several ways. Its cones are subtended by two lanceolate bracts, also called "foliola." The seeds in this group usually lack an apical ridge. These species are tropical or subtropical. They are concentrated in eastern and southeastern Asia and Malesia. These two subgenera overlap in places like New Caledonia and northeastern Australia.

The history of Podocarpus is tied to the supercontinent Gondwana. This massive landmass included Africa, South America, India, Australia, and New Zealand. Gondwana broke apart between 105 and 45 million years ago. Podocarpus was part of the ancient Antarctic flora. This flora grew in the cool, moist climate of southern Gondwana. As continents drifted north, they became hotter and drier. Podocarpus retreated to humid regions. In Australia, other plants like Acacia became more common.

Taxonomy, or the way we classify these plants, has changed often. Scientists use genetic and physiological evidence to group them. In 1969, de Laubenfels divided the genus into several groups. In 1985, he created the two subgenera used today. Some species were even moved to different genera like Afrocarpus. There is still some debate among experts. Plants of the World Online accepts 116 species. Other authorities count between 97 and 107 species.

Podocarpus macrophyllus inumaki
Podocarpus macrophyllus inumaki

Podocarpus species are often used as ornamental plants. People plant them in large gardens and parks. One specific cultivar is named 'County Park Fire.' This plant won the Royal Horticultural Society's Award of Garden Merit. You might know them by common names like "yellowwood" or "pine." For example, Podocarpus elatus is called the plum pine. Podocarpus macrophyllus is known as the Buddhist pine. Their leaves are often long and thin. They are tough and have a distinct midrib.

Podocarpus oleifolius-IMG 8771
Podocarpus oleifolius-IMG 8771
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File:Podocarpus macrophyllus inumaki.JPG
Podocarpus macrophyllus inumaki.JPG
File:PodocarpusTotara2.jpg
PodocarpusTotara2.jpg
File:Podocarpus oleifolius-IMG 8771.JPG
Podocarpus oleifolius-IMG 8771.JPG
File:Podocarpus neriifolius in Koishikawa gardens.jpg
Podocarpus neriifolius in Koishikawa gardens.jpg
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