​STEINHEFER, Juan (stine'-hay-fer), German botanist, b. in Silesia about 1650; d. in Sonora, Mexico, in 1716. He studied medicine, entered the Society of Jesus as lay-brother, and was sent as a physician to Mexico, where he was assigned to the missions of Sonora, making a study of the flora of that region, which was entirely unexplored. He wrote “Florilogio Medicinal Mejicano” (Mexico, 1712; Amsterdam, 1719; and Madrid, 1732).