Cycads / ˈsaɪkædz / are seed plants that typically have a stout and woody (ligneous) trunk with a crown of large, hard, stiff, evergreen and (usually) pinnate leaves. The species are dioecious, that is, individual plants of a species are either male or female. Cycads vary in size from having trunks only a few centimeters to several meters tall.

Cycad, any of the palmlike woody gymnospermous plants that constitute the order Cycadales. The order consists of three extant families, which contain about 10 genera and about 310 species. Some cycads are used as ornamental conservatory …

2021年5月17日 · Cycad plants are hardy, evergreen gymnosperms (cone-bearing plants) that grow in sand or hard rock. Cycads are dioecious plants; there are separate male and female plants. The female plant produces seeds, and the male plant produces cones filled with pollen. The most popular cycad is the sago palm. They are slow growing and have a long life.

Cycads are an ancient group of vascular plants that were once a prominent component of the world’s flora. The oldest cycad fossils date to the early Permian (280 million years ago) or late Carboniferous period (300–325 million years ago).

2015年5月22日 · Cycads are a group of gymnosperm trees and shrubs. They are woody, seed producing plants with no flowers or fruit. Cycads often look similar to palm trees with branchless stems and a crown of leave at the top of the tree, but they are not at …

Cycads (order Cycadales) are an ancient group of palmlike gymnosperms with about 300 extant species across three families. The plants are distinguished by crowns of large pinnately compound leaves and by large cones. Several species are grown as ornamentals.

Cycads are an ancient group of tropical and subtropical plants that have existed since the age of dinosaurs. They dominated the earth then, but are now endangered. There are more than 200 cycad species.

Cycas is a genus of cycad, and the only genus in the family Cycadaceae with all other genera of cycad being divided between the Stangeriaceae and Zamiaceae families. Cycas circinalis, a species endemic to India, was the first cycad species to be described in western literature, and is the type species of the genus. [4][5]

2024年4月1日 · Cycads, the earth's most ancient extant relict plants, represent the primordial group of seed plants (Wang et al., 2021). They offer an invaluable historical lens on growth and evolution, placing them at the heart of studies on the origins and …

Cycads are ancient plants resembling palms and tree ferns. Fossils of cycads have been discovered that date back to 280 million years ago. Cycads were the predominant vegetation during the Jurassic Period, which is often referred to as “The Age of Cycads”.