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Legumes are the plant family that restores nitrogen to the soil. Most of legumes have symbiotic nitrogen-fixing bacteria in structures called root nodules.
Alfalfa
A Legume is the seed of a plant in the bean family, Fabaceae. A Cereal grain is the seed of a plant in the grass family, Poaceae.
Legumes fix nitrogen in the soil.
No they are not. Peanuts are legumes, in the bean family. They grow from seed pods on an herbaceous plant. Despite being called "peanuts," they are not nuts, nor are they in the nut family. A potato is a starchy tuber, a root vegetable that grows in the ground. It is not a legume.
Guar gum is extracted from the bean of the Indian guar plant, a different plant. While it is true that guar gum is not derived from the seeds or any part of the soybean or soy plant, it should be noted that they are both members of the same plant family: legumes. As legumes, they can in fact cause an allergic reaction in anyone already allergic to another legume. This includes soy and peanuts, as well as beans and peas. Search for <Leguminous Plants> to find a full list of these soy "cousins".
Aloe is not a cactus; it is a succulent plant. While both aloe and cactus are adapted to dry environments and store water in their leaves, they belong to different plant families. Aloe plants are part of the Asphodelaceae family, while cacti belong to the Cactaceae family.
Scullcap species are members of the mint family, Lamiaceae.
Scullcap species are members of the mint family, Lamiaceae.
A legume.
Fabales is the scientific order of which kudzu [Pueraria lobata] is a member. Within that order, kudzu is a member of the family Fabaceae. That's the family of legumes, such as beans. Ironically, that also means that even though kudzu is an overly aggressive ground cover, it may contribute to soil fertility. Specifically, legumes are known for their ability to 'fix' nitrogen. That means that they make otherwise unavailable nitrogen in the soil available to plant roots and soil food web members.
They are all members of the family pinaceae.