The Fabaceae or Leguminosae is commonly known as the legume or pea family. They are economically important family of flowering plants. The Poaceae are a large family of monocotyledonous flowering plants. The Poaceae is the fifth largest plant family. Poaceae belongs to grass family of monocotyledonous flowering plants. It produces economically useful plants such as Barley, Maize, Oats, Rice, Bamboo, Meadow-grass, Ryegrass, etc. Most of the economically important plants in Febaceae family are herbs.

The two families that outnumber others in useful plants are Leguminosae and Graminae.

Leguminosae family:
- The Leguminosae family, also known as the Fabaceae family, is one of the largest families of flowering plants.
- It includes many economically important plants, including legumes such as peas, beans, lentils, and peanuts.
- Legumes are known for their ability to fix nitrogen in the soil through a symbiotic relationship with nitrogen-fixing bacteria in their root nodules.
- This makes legumes important for crop rotation, as they can improve soil fertility by increasing nitrogen levels.
- Legumes also have a high protein content and are a valuable source of dietary protein for both humans and livestock.
- Additionally, legumes are used as forage crops for livestock and are important in the production of animal feed.
- Some legumes, such as soybeans, are used for the production of vegetable oil and biodiesel.
- Legumes also play a role in agroforestry systems, where they are used for soil conservation, erosion control, and as shade trees.
- Many legumes have medicinal properties and are used in traditional herbal medicine for various purposes.

Graminae family:
- The Graminae family, also known as the Poaceae family, is one of the largest families of flowering plants.
- It includes grasses, cereals, and bamboo, which are all economically important plants.
- Grasses are cultivated as crops for food, feed, and fiber. Some examples of important cereal crops include wheat, rice, corn, barley, and oats.
- Cereal crops are staple food sources for humans and provide a significant portion of their daily caloric intake.
- Grasses are also used as forage crops for livestock and contribute to the production of meat, milk, and other animal products.
- In addition, grasses are used for lawn and turf grasses, providing aesthetic appeal and recreational spaces.
- Bamboo, a member of the Graminae family, has various uses such as construction material, furniture, paper production, and as a food source for pandas.
- Grasses are also important for soil conservation, erosion control, and as a source of biomass for bioenergy production.
- Some grasses have medicinal properties and are used in traditional medicine for various purposes.

In conclusion, the Leguminosae and Graminae families are the two families that outnumber others in terms of useful plants. These families include economically important plants that provide food, feed, fiber, and other valuable resources. They play a crucial role in agriculture, horticulture, agroforestry, and traditional medicine. The high protein content, ability to fix nitrogen, and versatility of these plants make them significant contributors to human livelihoods and the global economy.