Yam (vegetable)
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Yam is the common name for some plant species in the genus Dioscorea that form edible tubers.
White yam variety, Dioscorea rotundata in local monday market in Kaduna, Nigeria
White yams at a retail market in Brixton, England, 2004
A yam
Freshly harvested purple yam (D. alata) sliced for cross-section
Sweet potato
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The sweet potato or sweetpotato is a dicotyledonous plant in the morning glory family, Convolvulaceae. Its sizeable, starchy, sweet-tasting tuberous roots are used as a root vegetable, which is a stap
Yam (vegetable)
…In some places, other (unrelated) root vegetables are sometimes referred to as "yams", including: In the United States, sweet potatoes (Ipomoea batatas), especially those with orange flesh, are often referred to as "yams" In Australia, the tubers of the Microseris walteri, or yam daisy…
Ipomoea batatas 006
The flowers, buds, and leaves of the sweet potato, which resemble those of the morning glory
Seeds
Seikei Zusetsu (~1800)