Conversation so far:
what is another name for a three leaf clover
Shamrock usually refers to either the species Trifolium dubium (lesser clover), or Trifolium repens (white clover).
where does the word shamrock come from
The name shamrock comes from Irish seamróg, which is the diminutive of the Irish word seamair óg and simply means young clover.
is the word shamrock only used for clover
Other three-leaved plants—such as Medicago lupulina, Trifolium pratense, and Oxalis acetosella—are sometimes called shamrocks.

Question: so what's the real one
Self-contained rewrite: so what plant is the real shamrock