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Note: Do not rely on this information. It is very old.
Trefoil
Trefoil, a general name for the species of the leguminous genus Trifolium, and some allied plants with ternate leaves, especially those which are commonly grown as fodder for cattle. Trifolium procumbens is known as "hop trefoil," from the shape of its flower-heads, and our species of Lotus as "bird's-foot trefoil," from the three horizontally-spreading claw~like legumes in an umbel. Trifolium incarnatum, (oU1tm inca,rnatwn, from being of comparatively is generally known to farmers simply as "trifolium." [CLOVER.]