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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.
The oldest records of the modern genus Cycas are from the Paleogene of East Asia. [31] Fossils assignable to Zamiaceae are known from the Cretaceous, [30] with fossils assignable to living genera of the family known from the Cenozoic. [18] Petrified cycad fossil, New York Botanical Garden
Zamia furfuracea leaves. The genus comprises deciduous shrubs with aerial or subterranean circular stems, often superficially resembling palms.They produce spirally arranged, pinnate leaves which are pubescent, at least when young, having branched and simple, transparent and coloured hairs.
The gymnosperms (/ ˈ dʒ ɪ m n ə ˌ s p ɜːr m z,-n oʊ-/ ⓘ nə-spurmz, -noh-; lit. ' revealed seeds ') are a group of woody, perennial seed-producing plants, typically lacking the protective outer covering which surrounds the seeds in flowering plants, that include conifers, cycads, Ginkgo, and gnetophytes, forming the clade Gymnospermae [2] The term gymnosperm comes from the ...
They do well in full sun or shade, but not in constant deep shade. They are fairly salt- and drought-tolerant but should be protected from extreme cold. They should occasionally be fed with palm food. After Cycas revoluta, this is probably the most popular cycad species in cultivation.
The flower-like williamsoniacean male reproductive structure Weltrichia is associated with the female reproductive structure Williamsonia, though it is uncertain whether the parent plants were monoecious (male and female reproductive structures being present on the same plant) or dioecious (where each plant has only one gender of reproductive ...
The leaves are a deep semiglossy green and about 50–150 cm (20–59 in) long when the plants are of a reproductive age. They grow out into a feather-like rosette to 1 m (3.3 ft) in diameter. The crowded, stiff, narrow leaflets are 8–18 cm (3.1–7.1 in) long and have strongly recurved or revolute edges.
This listing contains taxa of plants in the division Cycadophyta, recorded from South Africa.Cycads / ˈ s aɪ k æ d z / are seed plants with a very long fossil history that were formerly more abundant and more diverse than they are today.