Morphology, culture requirements, and medicinal effects of Androsace septentrionalis L. (Primulaceae) are described. In mice, water extracts of the plant (.5 ml/100g body weight) produced disturbances of the menstrual cycle and infertility after copulation. Histological studies showed enlargement of glandular mucosa cells and increased uterine connective tissue. Compared with controls, more corpora lutea were found in the fallopian tubes of treated animals. The plant is used in Siberian folk medicine for angina, heart diseases, epilepsy, gonorrhea, and as a contraceptive. The contraceptive and tranquilizing effects of the water extract of Androsace were evident in this experimentation.