Class Gymnospermae is a group of plants that encompass all non-flowering plants with seeds that are not enclosed within an ovary. It is commonly known as gymnosperms, which is derived from the Greek 'gymno' meaning naked and 'sperm' referring to the seed. Other synonyms for this class include naked seeded plants, gymnospermophyta, and conifers. Conifers are a subgroup of gymnosperms that have needle-like or scale-like leaves and produce cones. Another subgroup is Ginkgophyta, which only has a single living species, the Ginkgo biloba. These unique plants have fan-shaped leaves and produce fleshy seeds that are not protected by fruit. Overall, the class Gymnospermae represents a fascinating diversity of plant life that has captured the interest of biologists and botanists for centuries.