ntick trefoilany of various tropical and subtropical plants having trifoliate leaves and rough sticky pod sections or loments
Webster's Revised Unabridged Dictionary
Tick trefoil(Bot) a name given to many plants of the leguminous genus Desmodium, which have trifoliate leaves, and joined pods roughened with minute hooked hairs by which the joints adhere to clothing and to the fleece of sheep.
Over by the wire fence the tick-trefoil, desmodium, is in its glory.
"Some Summer Days in Iowa" by Frederick John Lazell