Fabales

Fabales is a large order of flowering plants. These plants belong to the rosid group of the eudicots. Scientists use different systems to classify these living things. The Angiosperm Phylogeny Group II, or APG II, is one such system. In this classification, Fabales includes several distinct plant families. This order is important because it contains many plants used for food. It also includes plants that support various insect species.

The structure of the Fabales order depends on the classification system used. Under the APG II system, the order includes four main families. The first is Fabaceae, which are also known as legumes. This family contains three subfamilies: Caesalpinioideae, Mimosoideae, and Faboideae. The second family is Quillajaceae. The third is Polygalaceae, which are often called milkworts. This family includes the groups Diclidantheraceae, Moutabeaceae, and Xanthophyllaceae. Finally, the order includes the Surianaceae family.

Different scientists have organized these families in different ways over time. The Cronquist system used a much narrower definition. Under the Cronquist system, the Fabales order contained only the Fabaceae family. Other families were placed in different orders entirely. For example, Cronquist put Polygalaceae in its own order called Polygalales. He also placed Quillajaceae and Surianaceae within the order Rosales. The Dahlgren system used a different name for this group. He placed them in a superorder called Fabiflorae, or Fabanae.

Research into these plants focuses on different areas based on their diversity. Most scientific study focuses on the Fabaceae family. This is because Fabaceae is the third-largest plant family in the world. It contains the majority of the diversity found within the Fabales order. These plants are also highly significant because they serve as food plants. The Polygalaceae family is also well researched. This is due to the large diversity found in the genus Polygala. Many members of this family are food sources for Lepidoptera. This term refers to butterflies and moths.

Scientists use molecular phylogenetic techniques to understand how these plants are related. This method looks at genetic relationships to build a family tree. While these techniques provide strong support for the existence of the Fabales order, some mysteries remain. Taxonomists are still studying the morphological relationships of certain families. This means they are looking at the physical shapes and structures of the plants. Specifically, they are studying how Quillajaceae and Surianaceae relate to the rest of the order. This research is limited because there is not yet much data on these two families.

We can use history to understand when these plants first appeared. Scientists use a method called molecular clock calculations to estimate time. This helps them determine when different lineages split apart. According to these calculations, the lineage for Fabales split from other plants about 101 million years ago. This long history has allowed the order to spread across much of the planet. The Fabales are described as a cosmopolitan order. This means they are found in many different parts of the world.

Even though the order is widespread, some groups have specific homes. The subfamily Papilionoideae, which is part of the Faboideae subfamily, has a unique distribution. It is well dispersed throughout the northern part of the North Temperate Zone. This shows how different parts of the Fabales order occupy different environments. Studying these patterns helps scientists understand how plants move and grow across the Earth. The study of Fabales connects botany to history, genetics, and ecology.