The Collaborative International Dictionary
Sainfoin \Sain"foin\ (?; 277), n. [F., fr. sain wholesome (L. sanus; see Sane.) + foin hay (L. f[ae]num); or perh. fr. saint sacred (L. sanctus; see Saint) + foin hay.] (Bot.)
A leguminous plant ( Onobrychis sativa) cultivated for fodder. [Written also saintfoin.]
A kind of tick trefoil ( Desmodium Canadense). [Canada]
Wikipedia
Desmodium canadense is a species of flowering plant in the legume family, Fabaceae. It is native to eastern North America. Its common names include showy tick-trefoil, Canadian tick-trefoil, and Canada tickclover.
The plant grows in woods, prairies, and disturbed habitat, such as roadsides. It is cultivated as an ornamental plant. It is a larval host plant for butterflies such as the Eastern Tailed-blue, Silver-spotted Skipper, and Hoary Edge.