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Melastomataceae

life science Maturity 11-13 Next article →

Melastomataceae is a large family of dicotyledonous flowering plants. These plants are found mostly in tropical regions of the world. In fact, two-thirds of their genera originate in the New World tropics. This family is incredibly diverse and widespread. It contains approximately 175 genera and about 5,115 known species. Melastomes can take many different forms in nature. They may grow as annual or perennial herbs. Some species grow as shrubs. Others develop into small trees.

Osbeckia muralis at Kadavoor
Osbeckia muralis at Kadavoor

One way to identify a melastome is by looking at its leaves. The leaves have a very distinctive pattern of veins, known as venation. These leaves are opposite and decussate, meaning they grow in pairs on the stem. The venation usually consists of three to seven longitudinal veins. These veins can arise from the base of the leaf blade. This pattern is called plinerved, where inner veins diverge above the base. Other species are pinnately nerved. In these plants, three or more pairs of primary veins diverge from the mid-vein at different points above the base.

Melastome leaves
Melastome leaves

The reproductive parts of these plants are also quite specific. The flowers are considered perfect, which means they contain both male and female parts. These flowers do not always grow alone. They can be borne singly on the plant. They may also grow in terminal or axillary, paniculate cymes. A cyme is a type of flower cluster. These clusters can grow at the ends of stems or in the axils, which are the angles between leaves and stems. This variety in flower arrangement helps define the different types within the family.

Taxonomy is the science of naming and classifying organisms. Scientists use specific systems to organize these plants. Under the APG III system of classification, the family changed. Seven genera that were once part of the Memecylaceae family are now included here. As of July 2025, there are 169 accepted genera within the Melastomataceae family. This includes a vast list of names like Acanthella, Andesanthus, and Tibouchina. The family also includes the extinct genus Melastomites. This classification helps researchers understand the evolutionary relationships between different plant groups.

Melastome leaves
Melastome leaves

While many melastomes are part of healthy ecosystems, some can become problematic. Certain species are regarded as invasive species. This happens when they are naturalized in tropical or subtropical environments outside their normal range. Once they arrive in a new area, they can spread quickly. Examples of invasive melastomes include Koster's curse, which is Clidemia hirta. Pleroma semidecandrum is another example. Miconia calvescens is also known to be invasive. These plants can change the balance of the environments they enter.

Osbeckia muralis at Kadavoor
Osbeckia muralis at Kadavoor

The relationship between melastomes and insects is a vital part of their ecology. Many stingless bees forage on these plants. Foraging is the act of searching for food resources. One specific species of bee is called Melipona bicolor. This bee species gathers pollen from the Melastomataceae taxon. Pollen is a key nutrient for the bees. This interaction shows how the plants and insects rely on one another. The success of the bees and the reproduction of the plants are often linked through this process.

Melastome leaves
Melastome leaves

Melastomataceae connects to many different areas of biological study. Botanists study their complex leaf venation and flower structures. Ecologists look at how invasive species like Miconia calvescens affect new habitats. Entomologists study the foraging habits of bees like Melipona bicolor. Even the history of classification is tied to this family through the APG III system. By studying these plants, we learn more about the diversity of life in the tropics. We also learn how plants, insects, and environments interact in a complex web.

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File:Melastome leaves.jpg
Melastome leaves.jpg
File:Osbeckia muralis at Kadavoor.jpg
Osbeckia muralis at Kadavoor.jpg
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