("sour," referring to the acid juice of the stem and leaves)

Family, Geranium. Color, white, with crimson or purplish veinings. Parts of the open, spreading flower in fives. Stamens, 10. Petals often notched. Styles, 5, separate. Flowers, single, one inch across, very pretty with their dark veinings, the petals thrown back, stamens and styles much in evidence. They terminate delicate, leafless scapes, springing with the leaves from a creeping rootstock. Leaves, 3-divided, notched, closing or "sleeping" at night by folding backward. May to July.

The whole plant lies upon the ground in the deep forest in little bunches or clusters. New England and Middle States, and in mountains of North Carolina. The plant produces cleistogamous blossoms, small, pollinated in the bud. This little plant lays claim to the following names: cuckoo's meat, sour trefoil, shamrock, alleluia. From it druggists obtain "salts of lemon."