Botanical Name of Yam

Today we are going to be treating varieties of Yam and their botanical name but before we start, what is a yam and what are the characteristics of a yam?

What Is a Yam?

A yam is a starchy edible tuber crop grown mainly in tropical and subtropical regions. It belongs to the genus Dioscorea and is widely cultivated in countries such as Nigeria, Ghana, and Côte d’Ivoire. It belongs to the kingdom plantae and subkingdom Tracheobionta.

Yams are:

Rich in carbohydrates and provide energy
Usually grown underground as tubers
Commonly used in foods like boiled yam, fried yam, pounded yam, and yam porridge
Different from sweet potatoes and cassava, although people sometimes confuse them

Yam plants are climbing vines with long stems and broad leaves, while the edible part is the underground tuber.

Characteristics of Yam

Yam is a tuber crop belonging to the genus Dioscorea. Below are the main characteristics of yam:

Tuber Crop
Yam grows underground as a large fleshy tuber used for food.
Starchy Food
It contains a high amount of carbohydrates, making it a major energy-giving food.
Climbing Plant
The yam plant grows as a vine and usually needs stakes or support to climb.
Broad Leaves
Yam plants have green broad leaves that help in photosynthesis.
Rough Outer Skin
Most yam tubers have a rough, brown, bark-like skin.
Different Flesh Colours
The inside of yam may be white, yellow, or purple depending on the variety.
Perishable Nature
Fresh yam can spoil if not stored properly.
Propagation by Tubers
Yam is commonly planted using pieces of tubers called “setts.”
Grows in Tropical Regions
Yam grows best in warm climates with adequate rainfall, especially in West Africa.
Nutritional Value
Yam contains vitamins, minerals, fibre, and small amounts of protein.

What is the Botanical Name of Yam?

The botanical name of yam is Dioscorea.

Different species of yam include:

Dioscorea rotundata – White yam
Dioscorea alata – Water/greater yam
Dioscorea cayenensis – Yellow yam

Why is the Botanical Name of Yam Being Dioscorea app?

The botanical name of yam is written as Dioscorea spp.

Here’s what it means:

Dioscorea = the genus name for yam plants.
spp. = an abbreviation for “species pluralis” (many species).

It is written this way because yam has many species, not just one. Examples include:

Dioscorea rotundata
Dioscorea alata
Dioscorea cayenensis

So, when people say “Dioscorea spp.”, they are referring to yam plants in general rather than one specific species.

Species/Varieties of Yam

Yam belongs to the genus Dioscorea and has many species grown in different parts of the world.

Common species/varieties include:

Dioscorea rotundata
- Commonly called white yam
- Widely grown in West Africa
- Popular for pounded yam
Dioscorea cayenensis
- Known as yellow yam
- Has yellow flesh due to natural pigments
- Common in tropical regions
Dioscorea alata
- Called water yam or greater yam
- Produces large tubers
- High yielding variety
Dioscorea dumetorum
- Known as bitter yam
- Has a slightly bitter taste
- Nutritious and medicinal in some areas
Dioscorea bulbifera
- Called aerial yam or air potato
- Produces bulbils above ground
Dioscorea esculenta
- Known as lesser yam
- Smaller tubers compared to other species
Dioscorea trifida
- Common in parts of South America and the Caribbean
- Smooth textured flesh

These yam species differ in size, colour, taste, yield, and growing conditions.

Botanical Names and Meaning of Different Species of Yam

Bitter yam – The botanical name of bitter yam is Dioscorea dumetorum

The bitter yam is a plant native to Africa. It contains a fleshy, potato-like root (tuber) that can be used for food or medicinal in times of famine. Bitter yams found in the wild are likely to contain poisons, thus they must be soaked and boiled before eating. Farmers’ bitter yams, on the other hand, are normally free of poisons because safer varieties are produced selectively.

White yam – The botanical name of white Yam is Dioscorea rotundata

This is a commonly farmed yam species in Africa, having over 200 variations.

The white yam tuber is generally cylindrical in shape, with a smooth and brown exterior and white, firm flesh.

Botanical name of yam continues below…

Water yam – The botanical of water yam is Dioscorea alata

Purple or winged yam is another name for this yam. The tuber’s shape is usually cylindrical, but it can vary. The flesh of the tuber is white and has a watery appearance.

Because of its extensive agricultural network, it is the most widely spread yam. It’s a tuber that can be found in Asia, Africa, and the Caribbean. They’re also known as purple yam, greater yam, or English winged yam.

After cassava and sweet potato, yams are Africa’s third most important tuber crop.

Yellow yam – The botanical name of yellow yam is Dioscorea cayennensis

Yellow yams are similar to sweet potatoes, however they are not a sweet potato substitute. The primary distinction between the two tubers is that yams are larger and have a thicker skin, whilst sweet potatoes are smaller and have a thin peel.

Botanical name of Yam continues below…

Wild bitter yam – The botanical name of wild bitter yam is Dioscorea esculenta

This is the third most popular yam variety. The origins of this species can be traced back to Southeast Asia. The tubers are baked, boiled, or fried in the same way that potatoes are. Mechanical cultivation is possible due to the tiny size of the tubers, which, together with its ease of preparation and flavor, could help the lesser yam become more popular in the future.

Cush-cush yam – The botanical name of Cush-Cush yam is Dioscorea trifida

It’s a perennial climbing plant with 3-meter-long twining stems that grow from a tuberous rootstock. These stems scramble across the ground or entangle themselves into the vegetation.

The plant’s edible root is commonly farmed in tropical places, particularly in South America and the Caribbean.

Chinese yam – The botanical name of Chinese yam is Dioscorea polystachya

It’s an ornamental vine that comes from Asia. It grows in North America as well, but it is unrelated to the popular sweet potatoes known as yams. Cinnamon vine and shan yao are two other names for Chinese yam.

Chinese yam has traditionally been used to treat stomach, spleen, lungs, and kidney diseases in Chinese herbal medicine.

Diosgenin, found in the roots of Chinese yam, can be utilized to make steroid hormones like estrogen and progesterone in the lab.

While both the tuber and the bulbs of the Chinese yam are edible, only the tuber is commonly eaten.

Frequently Asked Questions: Botanical Name of Yam

1. What is the botanical name of yam?

The botanical name of yam is Dioscorea.

2. Why is yam called Dioscorea spp.?

It is called Dioscorea spp. because yam has many species. “spp.” means multiple species within the genus Dioscorea.

3. What family does yam belong to?

Yam belongs to the Dioscoreaceae family.

4. Is yam the same as sweet potato?

No. Yam and sweet potato are different crops. Yam belongs to the genus Dioscorea, while sweet potato belongs to the genus Ipomoea.

5. What are common species of yam?

Common species include:

Dioscorea rotundata
Dioscorea alata
Dioscorea cayenensis

6. Where is yam commonly grown?

Yam is mainly grown in tropical regions, especially in countries like Nigeria, Ghana, and Côte d’Ivoire.

7. What type of crop is yam?

Yam is a tuber crop grown mainly for its edible underground tubers.

8. How is yam propagated?

Yam is usually propagated using pieces of tubers called setts.

9. What nutrients are found in yam?

Yam contains carbohydrates, fiber, vitamins, and minerals that provide energy and nutrition.

10. What is the importance of yam?

Yam is important as a staple food, source of income for farmers, and raw material for some industries.

Conclusion

Yam is an important food crop widely cultivated in tropical regions, especially in Nigeria and other parts of West Africa. Its botanical name, Dioscorea, represents a group of different yam species grown for their edible tubers. Yams are valued for their nutritional benefits, economic importance, and role as a staple food in many homes. Understanding the characteristics, species, and uses of yam helps farmers, students, and consumers appreciate its importance in agriculture and daily life.

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