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    Does anyone know the difference between a Sweet potato and a Yam?

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Here are some friends with simlar question as we.And I have this question for many days,anyone help us?
Kitty said: Yes.Does anyone know the difference between a Sweet potato and a Yam?-I try seach this on internet but no results found.Maybe this is a stupid question.
Mike said: oh,no,you are wrong.I have found as below for this question(Does anyone know the difference between a Sweet potato and a Yam?),it will help you,my kids.



Answers:
http://www.ces.ncsu.edu/depts/hort/hil/hil-23-a.html

Factor
Sweetpotato
Yam

1.
Scientific Name
Ipomoea batatas
Dioscorea Species

2.
Plant family
Morningglory (Convolvulaceae)
Yam (Dioscoreaceae)

3.
Plant group
Dicotyledon
Monocotyledon

4.
Chromosome number
2n=90 (hexaploid)
2n=20

5.
Flower character
Monoecious
Dioecious

6.
Origin
Tropical America (Peru, Ecuador)
West Africa, Asia

7.
Historical beginning
Prehistoric
50,000 BC

8.
Edible storage organ
Storage root
Tuber

9.
Number/plant
4 to 10
1 to 5

10.
Appearance
Smooth, with thin skin
Rough, scaly

11.
Shape
Short, blocky, tapered ends
Long, cylindrical, some with "toes"

12.
Dry matter
22 to 28%
20 to 35%

13.
Mouth feel
Moist*
Dry

14.
Taste
Sweet*
Starchy

15.
Beta carotene (Vit. A)
High (orange vars.)*
Very low

16.
Propagation
Transplants/vine cuttings
Tuber pieces

17.
Growing season
90 to 150 days (120= Jewel)
180 to 360 days

18.
Maturity
None
At senescence

19.
Storage
(Cured at 80 to 86oF) 55 to 60oF
54 to 61oF

20.
Climatic requirements
Tropical and temperate
Tropical

21.
Availability
Grown in USA
Imported from Caribbean

I think they are both yucky...so there are NO differences to me.

Other Answers:
They are one and the same.

In the states, they are the same.

In reality yams are a different type of tuber. I think that they are in africa or something.

I'm with dk on this one They are Not the same. A Yam is a legume like a peanut, a sweet potato is a tuber like a potato which is a storage form of energy for the plant.

Yams are Sweet potatoes its just the way their made. Yams tend to be sweeter.

Yams and sweet potatoes aren't the same. There are different types of yams actually. Some yams have a very thick skin, dark brown in color. And they are not sweet at all. Havn't seen those here in the US though. These yams actually taste great if prepared well.The ones v get here are not so good.

You can charge more at a restaurant for a Yam than you can for a sweet potato. A sweet potoato is orange and a yam is yellowish-white and a much sweeter potato than a sweet potoato!

There is no difference except some people call yams, sweet potatoes and sweet potatoes, yams...
Source(s):
The Root itself....

They are NOT the same.

Yams are white inside and very, very large. They're not as commonly found in the US but are commonly used as a starch in Africa. Normally harvested when they are between 2 and 6 pounds, they can actually grow to 150 pounds though they're not edible at that weight.

A sweet potato is the orange potato we are used to seeing and although erroneously called yams by people and the various companies that process them...if it's an orange potato, it is a sweet potato and nothing else.


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