The term 'Certain Lilies' refers to a genus of lilies known as Sego. Sego lilies are native to the western United States and are found in the deserts of Utah, Nevada, and California. They are perennial plants that produce white, yellow, or pink flowers. The flowers have six petals and are often used in bouquets and floral arrangements. Sego lilies are also known for their medicinal properties and are used to treat a variety of ailments.