Cycas is often referred to as a 'living fossil' because it retains primitive traits such as motile, flagellated male gametes and circinate vernation in its leaves. These features are highly reminiscent of Pteridophytes (ferns), suggesting an evolutionary link between the seed-bearing gymnosperms and the spore-bearing vascular plants.

Cycads are gymnosperms that typically lack axillary buds on their stems. Their growth is generally characterized by a simple, unbranched trunk topped with a crown of large, pinnate leaves. The absence of axillary branching is a distinct morphological trait that differentiates them from many other seed-bearing plant groups.

In the hierarchical classification of gymnosperms, Cycas is a genus placed within the division Cycadophyta. This division encompasses plants that typically exhibit a palm-like appearance, characterized by pinnately compound leaves and the production of seeds in strobili or cones.

The genus Cycas is the type genus for the family Cycadaceae. Cycadophyta is the division, Cycadopsida is the class, and Cycadales is the order to which this family belongs.

The stem of a Cycas plant is covered with persistent, dry, and brown-colored scale leaves. These structures provide protection to the apical meristem and the developing foliage leaves, reflecting the plant's adaptation to its environment.

In the hierarchical classification of plants, Cycas is a genus within the order Cycadales. Cycadophyta is the division, Cycadopsida is the class, and Cycadaceae is the family. The suffix '-ales' is the standard botanical nomenclature ending used to denote an order, making Cycadales the correct taxonomic rank for this group.

Following fertilization, the oosphere (egg cell) develops into an embryo. In Cycas, the initial divisions of the proembryo lead to the formation of a structure containing approximately 200 to 300 cells before further differentiation into the mature embryonic tissues occurs.

Cycas plants are known for their large, robust foliage leaves. Depending on the species, these pinnately compound leaves can reach significant lengths, often growing up to 6 feet or more. This impressive leaf size is a characteristic feature that contributes to the palm-like appearance of the plant.

Cycas revoluta, commonly known as the sago palm, stores significant amounts of starch within its stem tissues. The pith and cortex are processed to extract this starch, which is commercially referred to as sago, a common food source in various regions.

In Cycas, the foliage leaves are persistent for a certain period before they undergo senescence and abscission. While environmental factors can influence this, the leaves generally persist for about two years. This duration is characteristic of the slow-growing nature of these gymnosperms, which maintain their photosynthetic canopy for multiple seasons.